Refactor: improve code modularity

Frontend/src/app.tsx

@@ -1,7 +1,7 @@
 // Path: Frontend/src/app.tsx
 
 import type { JSX } from "solid-js";
-import { AppShell } from "./components/shell/AppShell/AppShell";
+import { AppShell } from "./components/app-shell/AppShell/AppShell";
 import "./styles/main.scss";
 import "./styles/user-overrides.scss";
 

Frontend/src/components/app-shell/AppShell/AppShell.tsx

@@ -1,17 +1,19 @@
-// Path: Frontend/src/components/shell/AppShell/AppShell.tsx
+// Path: Frontend/src/components/app-shell/AppShell/AppShell.tsx
 
 import { createSignal, onCleanup, onMount, Show, type JSX } from "solid-js";
-import { getDocumentTheme, setTheme, type Theme } from "../../../theme/runtime";
-import { WorkspaceHome } from "../../workspace-home/WorkspaceHome/WorkspaceHome";
+import { getDocumentTheme, setTheme, type Theme } from "../../../helper/themeRuntime";
+import { BootstrapWizard } from "../../bootstrap/BootstrapWizard/BootstrapWizard";
+import { WorkspaceHome } from "../../workspace-home/WorkspaceHome";
 import { AppShellDataProvider, useAppShellData } from "../data/app-shell.context";
-import { LeftRail } from "../LeftRail/LeftRail";
+import { LeftRail } from "../../workspace-navigation/LeftRail/LeftRail";
 import { MobileBottomNav } from "../MobileBottomNav/MobileBottomNav";
-import { MobileWorkspaceBrowser } from "../MobileWorkspaceBrowser/MobileWorkspaceBrowser";
+import { MobileWorkspaceBrowser } from "../../workspace-navigation/MobileWorkspaceBrowser/MobileWorkspaceBrowser";
 import { ServerDock } from "../ServerDock/ServerDock";
-import { NotificationsMenu } from "../TopBar/NotificationsMenu";
-import { ProfileMenu } from "../TopBar/ProfileMenu";
-import { TopBar } from "../TopBar/TopBar";
-import { WorkspaceSidebar } from "../WorkspaceSidebar/WorkspaceSidebar";
+import { NotificationsMenu } from "../../top-bar/TopBar/NotificationsMenu";
+import { ProfileMenu } from "../../top-bar/TopBar/ProfileMenu";
+import { TopBar } from "../../top-bar/TopBar/TopBar";
+import { WorkspaceTopBar } from "../../workspace-navigation/WorkspaceTopBar/WorkspaceTopBar";
+import { WorkspaceSidebar } from "../../workspace-navigation/WorkspaceSidebar/WorkspaceSidebar";
 import styles from "./AppShell.module.scss";
 
 type MobileWorkspaceView = "notifications" | "profile" | null;
@@ -80,6 +82,8 @@ const AppShellContent = (): JSX.Element => {
 		setActiveMobileWorkspaceView(null);
 	};
 
+	const workspaceBreadcrumb = (): string => `${appShellData.activeServer().name} / ${appShellData.activeProject().name} / Home`;
+
 	return (
 		<div class={styles.shell} data-ui="app-shell" data-app-shell-status={appShellData.status()}>
 			<TopBar
@@ -124,12 +128,16 @@ const AppShellContent = (): JSX.Element => {
 						<Show
 							when={isMobileViewport() && activeMobileWorkspaceView() !== null}
 							fallback={
-								<WorkspaceHome
-									sidebarCollapsed={isSidebarCollapsed()}
-									onToggleSidebarCollapse={(): void => {
-										setIsSidebarCollapsed((collapsed) => !collapsed);
-									}}
-								/>
+								<>
+									<WorkspaceTopBar
+										sidebarCollapsed={isSidebarCollapsed()}
+										breadcrumb={workspaceBreadcrumb()}
+										onToggleSidebarCollapse={(): void => {
+											setIsSidebarCollapsed((collapsed) => !collapsed);
+										}}
+									/>
+									<WorkspaceHome />
+								</>
 							}
 						>
 							<div class={styles.mobileWorkspaceView} data-slot="mobile-workspace-view" data-view={activeMobileWorkspaceView() ?? undefined}>
@@ -162,6 +170,7 @@ const AppShellContent = (): JSX.Element => {
 					setIsMobileWorkspaceBrowserOpen(false);
 				}}
 			/>
+			<BootstrapWizard />
 		</div>
 	);
 };

Frontend/src/components/app-shell/MobileBottomNav/MobileBottomNav.tsx

@@ -1,4 +1,4 @@
-// Path: Frontend/src/components/shell/MobileBottomNav/MobileBottomNav.tsx
+// Path: Frontend/src/components/app-shell/MobileBottomNav/MobileBottomNav.tsx
 
 import { For, type JSX } from "solid-js";
 import { useAppShellData } from "../data/app-shell.context";

Frontend/src/components/app-shell/ServerDock/ServerDock.tsx

@@ -1,4 +1,4 @@
-// Path: Frontend/src/components/shell/ServerDock/ServerDock.tsx
+// Path: Frontend/src/components/app-shell/ServerDock/ServerDock.tsx
 
 import { For, Show, type JSX } from "solid-js";
 import { useAppShellData } from "../data/app-shell.context";

Frontend/src/components/app-shell/data/app-shell.builders.ts

@@ -0,0 +1,169 @@
+// Path: Frontend/src/components/app-shell/data/app-shell.builders.ts
+
+import {
+	activeDepartment as fallbackActiveDepartment,
+	activeProject as fallbackActiveProject,
+	activeServer as fallbackActiveServer,
+	activeUserProfile as fallbackActiveUserProfile,
+	departmentItems as fallbackDepartmentItems,
+	organizationAdminDockActions,
+	personalDockActions,
+	projectItems as fallbackProjectItems,
+	railItems as fallbackRailItems,
+	workspaceTree as fallbackWorkspaceTree,
+	type ActiveDepartment,
+	type ActiveProject,
+	type ActiveServer,
+	type ActiveUserProfile,
+	type DepartmentItem,
+	type ProjectItem,
+	type RailItem,
+	type WorkspaceTreeNode,
+} from "./shell.data";
+import type { AppShellPayload } from "./app-shell.types";
+
+const buildAbbreviation = (name: string, fallback: string): string => {
+	const parts = name
+		.trim()
+		.split(/\s+/)
+		.filter(Boolean);
+
+	if (parts.length === 0) {
+		return fallback;
+	}
+
+	const abbreviation = parts
+		.slice(0, 2)
+		.map((part) => part[0]?.toUpperCase() ?? "")
+		.join("");
+
+	return abbreviation || fallback;
+};
+
+export const buildRailItems = (payload: AppShellPayload | null): readonly RailItem[] => {
+	if (!payload?.installation || payload.organizations.length === 0) {
+		return fallbackRailItems;
+	}
+
+	const kind = payload.installation.mode === "personal" ? "personal" : "organization";
+	const serverName = payload.installation.name || payload.organizations[0]?.name || payload.installation.host;
+
+	return payload.organizations.map((organization, index) => ({
+		id: organization.id,
+		label: serverName || organization.name,
+		abbreviation: buildAbbreviation(serverName || organization.name, kind === "personal" ? "P" : "O"),
+		kind,
+		active: index === 0,
+	}));
+};
+
+export const buildActiveServer = (payload: AppShellPayload | null): ActiveServer => {
+	const installation = payload?.installation;
+	const organization = payload?.organizations[0];
+
+	if (!installation || !organization) {
+		return fallbackActiveServer;
+	}
+
+	const kind = installation.mode === "personal" ? "personal" : "organization";
+	const serverName = installation.name || organization.name || installation.host;
+
+	return {
+		id: installation.id,
+		name: serverName || fallbackActiveServer.name,
+		abbreviation: buildAbbreviation(serverName, kind === "personal" ? "P" : "O"),
+		kind,
+		connectedLabel: kind === "organization" ? `${payload?.teams.length ?? 0} connected` : undefined,
+		subtitle: kind === "personal" ? installation.host || payload?.admin?.homeTitle || "Personal home" : undefined,
+		dockActions: kind === "personal" ? personalDockActions : organizationAdminDockActions,
+	};
+};
+
+export const buildProjectItems = (payload: AppShellPayload | null): readonly ProjectItem[] => {
+	if (!payload?.projects.length) {
+		return fallbackProjectItems;
+	}
+
+	return payload.projects.map((project, index) => ({
+		id: project.id,
+		name: project.name,
+		description: project.slug || "Persisted project workspace",
+		groupLabel: payload.departments.find((department) => department.id === project.departmentId)?.name || "Projects",
+		parentLabel:
+			payload.teams.find((team) => team.id === project.teamId)?.name ||
+			payload.departments.find((department) => department.id === project.departmentId)?.name ||
+			"Shared project",
+		meta: (() => {
+			const workspaceCount = payload.workspaces.filter((workspace) => workspace.projectId === project.id).length;
+
+			return workspaceCount > 0 ? `${workspaceCount} workspace${workspaceCount === 1 ? "" : "s"}` : undefined;
+		})(),
+		active: index === 0,
+	}));
+};
+
+export const buildActiveProject = (payload: AppShellPayload | null): ActiveProject => {
+	const firstProject = payload?.projects[0];
+
+	if (!firstProject) {
+		return fallbackActiveProject;
+	}
+
+	return {
+		id: firstProject.id,
+		name: firstProject.name,
+	};
+};
+
+export const buildDepartmentItems = (payload: AppShellPayload | null): readonly DepartmentItem[] => {
+	if (!payload?.departments.length) {
+		return fallbackDepartmentItems;
+	}
+
+	return payload.departments.map((department, index) => ({
+		id: department.id,
+		name: department.name,
+		teams: payload.teams.filter((team) => team.departmentId === department.id).map((team) => team.name),
+		active: index === 0,
+	}));
+};
+
+export const buildActiveDepartment = (payload: AppShellPayload | null): ActiveDepartment => {
+	const firstDepartment = payload?.departments[0];
+
+	if (!firstDepartment) {
+		return fallbackActiveDepartment;
+	}
+
+	const firstTeamName = payload?.teams.find((team) => team.departmentId === firstDepartment.id)?.name ?? "";
+
+	return {
+		id: firstDepartment.id,
+		name: firstDepartment.name,
+		teamName: firstTeamName,
+	};
+};
+
+export const buildWorkspaceTree = (payload: AppShellPayload | null): readonly WorkspaceTreeNode[] => {
+	if (!payload?.projects.length) {
+		return fallbackWorkspaceTree;
+	}
+
+	return [];
+};
+
+export const buildActiveUserProfile = (payload: AppShellPayload | null): ActiveUserProfile => {
+	if (!payload?.admin) {
+		return fallbackActiveUserProfile;
+	}
+
+	const organizationName = payload.installation?.name || payload.organizations[0]?.name || fallbackActiveServer.name;
+	const departmentName = payload.departments[0]?.name;
+
+	return {
+		name: payload.admin.displayName,
+		email: payload.admin.email,
+		roleLabel: payload.admin.isInstanceAdmin ? "Instance admin" : "Member",
+		contextLabel: departmentName ? `${organizationName} • ${departmentName}` : organizationName,
+	};
+};

Frontend/src/components/app-shell/data/app-shell.context.tsx

@@ -0,0 +1,97 @@
+// Path: Frontend/src/components/app-shell/data/app-shell.context.tsx
+
+import {
+	createContext,
+	createMemo,
+	createSignal,
+	onMount,
+	useContext,
+	type JSX,
+} from "solid-js";
+import { resolveAPIBase } from "../../../lib/api";
+import {
+	buildActiveDepartment,
+	buildActiveProject,
+	buildActiveServer,
+	buildActiveUserProfile,
+	buildDepartmentItems,
+	buildProjectItems,
+	buildRailItems,
+	buildWorkspaceTree,
+} from "./app-shell.builders";
+import type { AppShellContextValue, AppShellPayload } from "./app-shell.types";
+import { normalizeAppShellPayload } from "./app-shell.types";
+
+const AppShellContext = createContext<AppShellContextValue>();
+
+export const AppShellDataProvider = (props: { children: JSX.Element }): JSX.Element => {
+	const [status, setStatus] = createSignal<"idle" | "loading" | "success" | "error">("idle");
+	const [error, setError] = createSignal("");
+	const [payload, setPayload] = createSignal<AppShellPayload | null>(null);
+
+	const load = async (): Promise<void> => {
+		setStatus("loading");
+		setError("");
+
+		try {
+			const response = await fetch(`${resolveAPIBase()}/app-shell`, {
+				headers: {
+					Accept: "application/json",
+				},
+			});
+
+			const body = (await response.json()) as {
+				data?: AppShellPayload;
+				error?: { message?: string } | string;
+				message?: string;
+			};
+			const errorMessage =
+				typeof body.message === "string"
+					? body.message
+					: typeof body.error === "string"
+						? body.error
+						: body.error?.message;
+
+			if (!response.ok || !body.data) {
+				throw new Error(errorMessage || "Failed to load app shell state.");
+			}
+
+			setPayload(normalizeAppShellPayload(body.data));
+			setStatus("success");
+		} catch (loadError) {
+			setStatus("error");
+			setError(loadError instanceof Error ? loadError.message : "Failed to load app shell state.");
+		}
+	};
+
+	onMount(() => {
+		void load();
+	});
+
+	const value: AppShellContextValue = {
+		status,
+		error,
+		installation: createMemo(() => payload()?.installation),
+		railItems: createMemo(() => buildRailItems(payload())),
+		activeServer: createMemo(() => buildActiveServer(payload())),
+		activeProject: createMemo(() => buildActiveProject(payload())),
+		activeDepartment: createMemo(() => buildActiveDepartment(payload())),
+		projectItems: createMemo(() => buildProjectItems(payload())),
+		departmentItems: createMemo(() => buildDepartmentItems(payload())),
+		workspaceTree: createMemo(() => buildWorkspaceTree(payload())),
+		activeUserProfile: createMemo(() => buildActiveUserProfile(payload())),
+		reload: load,
+	};
+
+	return <AppShellContext.Provider value={value}>{props.children}</AppShellContext.Provider>;
+};
+
+export const useAppShellData = (): AppShellContextValue => {
+	const context = useContext(AppShellContext);
+
+	if (!context) {
+		throw new Error("useAppShellData must be used within AppShellDataProvider");
+	}
+
+	return context;
+};

Frontend/src/components/app-shell/data/app-shell.types.ts

@@ -0,0 +1,130 @@
+// Path: Frontend/src/components/app-shell/data/app-shell.types.ts
+
+import type { Accessor } from "solid-js";
+import type {
+	ActiveDepartment,
+	ActiveProject,
+	ActiveServer,
+	ActiveUserProfile,
+	DepartmentItem,
+	ProjectItem,
+	RailItem,
+	WorkspaceTreeNode,
+} from "./shell.data";
+
+export type AppShellInstallation = {
+	id: string;
+	name: string;
+	mode: "personal" | "organizational" | string;
+	access: string;
+	protocol: string;
+	host: string;
+	isBootstrapped: boolean;
+	materializationStatus: "not_started" | "pending" | "running" | "succeeded" | "failed" | string;
+	materializationError?: string;
+};
+
+export type AppShellAdmin = {
+	id: string;
+	email: string;
+	displayName: string;
+	isInstanceAdmin: boolean;
+	homeTitle: string;
+};
+
+export type AppShellOrganization = {
+	id: string;
+	name: string;
+	slug: string;
+};
+
+export type AppShellDepartment = {
+	id: string;
+	organizationId: string;
+	name: string;
+	slug: string;
+};
+
+export type AppShellTeam = {
+	id: string;
+	organizationId: string;
+	departmentId?: string;
+	name: string;
+	slug: string;
+};
+
+export type AppShellProject = {
+	id: string;
+	organizationId: string;
+	departmentId?: string;
+	teamId?: string;
+	name: string;
+	slug: string;
+};
+
+export type AppShellWorkspace = {
+	id: string;
+	organizationId: string;
+	name: string;
+	slug: string;
+	kind: "organization" | "department" | "team" | "project" | string;
+	departmentId?: string;
+	teamId?: string;
+	projectId?: string;
+};
+
+export type AppShellPayload = {
+	installation?: AppShellInstallation;
+	admin?: AppShellAdmin;
+	organizations: AppShellOrganization[];
+	departments: AppShellDepartment[];
+	teams: AppShellTeam[];
+	projects: AppShellProject[];
+	workspaces: AppShellWorkspace[];
+};
+
+export type AppShellContextValue = {
+	status: Accessor<"idle" | "loading" | "success" | "error">;
+	error: Accessor<string>;
+	installation: Accessor<AppShellInstallation | undefined>;
+	railItems: Accessor<readonly RailItem[]>;
+	activeServer: Accessor<ActiveServer>;
+	activeProject: Accessor<ActiveProject>;
+	activeDepartment: Accessor<ActiveDepartment>;
+	projectItems: Accessor<readonly ProjectItem[]>;
+	departmentItems: Accessor<readonly DepartmentItem[]>;
+	workspaceTree: Accessor<readonly WorkspaceTreeNode[]>;
+	activeUserProfile: Accessor<ActiveUserProfile>;
+	reload: () => Promise<void>;
+};
+
+export const normalizeInstallation = (
+	installation: AppShellInstallation | null | undefined,
+): AppShellInstallation | undefined => {
+	if (!installation) {
+		return undefined;
+	}
+
+	const materializationStatus = installation.materializationStatus?.trim()
+		? installation.materializationStatus
+		: installation.isBootstrapped
+			? "succeeded"
+			: "not_started";
+	const materializationError = installation.materializationError?.trim() || undefined;
+
+	return {
+		...installation,
+		materializationStatus,
+		materializationError,
+	};
+};
+
+export const normalizeAppShellPayload = (payload: AppShellPayload | null | undefined): AppShellPayload => ({
+	installation: normalizeInstallation(payload?.installation),
+	admin: payload?.admin,
+	organizations: Array.isArray(payload?.organizations) ? payload.organizations : [],
+	departments: Array.isArray(payload?.departments) ? payload.departments : [],
+	teams: Array.isArray(payload?.teams) ? payload.teams : [],
+	projects: Array.isArray(payload?.projects) ? payload.projects : [],
+	workspaces: Array.isArray(payload?.workspaces) ? payload.workspaces : [],
+});

Frontend/src/components/app-shell/data/shell.context-menu.ts

@@ -0,0 +1,174 @@
+// Path: Frontend/src/components/app-shell/data/shell.context-menu.ts
+
+import { getWorkspaceCreateActions, getWorkspaceItemTypeDefinition } from "./shell.registry";
+import type {
+	ActiveProject,
+	ProjectContextMenuAction,
+	ProjectContextMenuSection,
+	ProjectItem,
+	ProjectMenuTarget,
+	WorkspaceContextMenuSection,
+	WorkspaceContextMenuTarget,
+	WorkspaceStaticItem,
+	WorkspaceTreeNode,
+} from "./shell.types";
+
+export { getWorkspaceContextMenuEyebrow } from "./shell.registry";
+
+export const createWorkspaceSurfaceTarget = (workspace: ActiveProject): WorkspaceContextMenuTarget => ({
+	id: `workspace-${workspace.id}`,
+	label: workspace.name,
+	kind: "workspace",
+});
+
+export const createWorkspaceStaticTarget = (item: WorkspaceStaticItem): WorkspaceContextMenuTarget => ({
+	id: item.id,
+	label: item.label,
+	kind: item.contextKind,
+});
+
+export const createWorkspaceTreeTarget = (node: WorkspaceTreeNode): WorkspaceContextMenuTarget => ({
+	id: node.id,
+	label: node.label,
+	...(node.kind === "folder"
+		? { kind: "folder" as const }
+		: {
+			kind: "item" as const,
+			itemType: node.itemType,
+		}),
+});
+
+export const getWorkspaceContextMenuSections = (
+	target: WorkspaceContextMenuTarget,
+): readonly WorkspaceContextMenuSection[] => {
+	const createActions = getWorkspaceCreateActions();
+	const createSubmenuAction = {
+		id: "create",
+		label: "Create",
+		children: createActions,
+	} as const;
+
+	switch (target.kind) {
+		case "workspace":
+			return [
+				{ id: "create", label: undefined, items: [createSubmenuAction] },
+				{
+					id: "workspace",
+					label: undefined,
+					items: [
+						{ id: "rename-workspace", label: "Rename workspace", shortcut: { key: "enter" } },
+						{ id: "copy-workspace-link", label: "Copy link", shortcut: { modifiers: ["meta"], key: "c" } },
+					],
+				},
+			] as const;
+		case "home":
+			return [
+				{ id: "create", label: undefined, items: [createSubmenuAction] },
+				{ id: "workspace", label: undefined, items: [{ id: "open-home", label: "Open home", shortcut: { key: "enter" } }] },
+			] as const;
+		case "settings":
+			return [
+				{
+					id: "settings",
+					label: undefined,
+					items: [
+						{ id: "open-settings", label: "Open settings", shortcut: { key: "enter" } },
+						{ id: "copy-settings-link", label: "Copy link", shortcut: { modifiers: ["meta"], key: "c" } },
+					],
+				},
+			] as const;
+		case "folder":
+			return [
+				{ id: "open", items: [{ id: "open-folder", label: "Open folder", shortcut: { key: "enter" } }, { id: "rename-folder", label: "Rename", shortcut: { modifiers: ["meta"], key: "r" } }] },
+				{ id: "create", label: undefined, items: [createSubmenuAction] },
+				{
+					id: "organize",
+					label: undefined,
+					items: [
+						{ id: "move-folder", label: "Move…", shortcut: { modifiers: ["meta"], key: "m" } },
+						{ id: "delete-folder", label: "Delete", shortcut: { modifiers: ["meta"], key: "delete" }, tone: "danger" },
+					],
+				},
+			] as const;
+		case "item": {
+			const definition = getWorkspaceItemTypeDefinition(target.itemType);
+			const actionPrefix = definition.actionPrefix;
+			const nounLabel = definition.noun;
+
+			return [
+				{
+					id: `${actionPrefix}-primary`,
+					items: [
+						{ id: `open-${actionPrefix}`, label: `Open ${nounLabel}`, shortcut: { key: "enter" } },
+						{ id: `rename-${actionPrefix}`, label: "Rename", shortcut: { modifiers: ["meta"], key: "r" } },
+					],
+				},
+				{
+					id: "organize",
+					label: undefined,
+					items: [
+						{ id: `move-${actionPrefix}`, label: "Move…", shortcut: { modifiers: ["meta"], key: "m" } },
+						{ id: `delete-${actionPrefix}`, label: "Delete", shortcut: { modifiers: ["meta"], key: "delete" }, tone: "danger" },
+					],
+				},
+			] as const;
+		}
+	}
+};
+
+const getProjectCreateActions = (): readonly ProjectContextMenuAction[] =>
+	[
+		{ id: "new-project", label: "New project" },
+		{ id: "new-folder", label: "New folder" },
+	] as const;
+
+const getProjectFolderDangerActions = (): readonly ProjectContextMenuAction[] =>
+	[
+		{ id: "rename-folder", label: "Rename", shortcut: { modifiers: ["meta"], key: "r" } },
+		{ id: "delete-folder", label: "Delete", shortcut: { modifiers: ["meta"], key: "delete" }, tone: "danger" },
+	] as const;
+
+export const createProjectSurfaceTarget = (label = "Projects"): ProjectMenuTarget => ({
+	id: "project-surface",
+	label,
+	kind: "surface",
+});
+
+export const createProjectFolderTarget = (id: string, label: string): ProjectMenuTarget => ({
+	id,
+	label,
+	kind: "folder",
+});
+
+export const createProjectTarget = (project: ProjectItem): ProjectMenuTarget => ({
+	id: project.id,
+	label: project.name,
+	kind: "project",
+});
+
+export const getProjectContextMenuEyebrow = (target: ProjectMenuTarget): string => {
+	switch (target.kind) {
+		case "surface":
+			return "Projects";
+		case "folder":
+			return "Folder";
+		case "project":
+			return "Project";
+	}
+};
+
+export const getProjectContextMenuSections = (target: ProjectMenuTarget): readonly ProjectContextMenuSection[] => {
+	const createActions = getProjectCreateActions();
+
+	switch (target.kind) {
+		case "surface":
+			return [{ id: "create", items: createActions }] as const;
+		case "folder":
+			return [
+				{ id: "create", items: createActions },
+				{ id: "organize", items: getProjectFolderDangerActions() },
+			] as const;
+		case "project":
+			return [{ id: "create", items: createActions }] as const;
+	}
+};

Frontend/src/components/app-shell/data/shell.data.ts

@@ -0,0 +1,6 @@
+// Path: Frontend/src/components/app-shell/data/shell.data.ts
+
+export * from "./shell.types";
+export * from "./shell.registry";
+export * from "./shell.scaffold";
+export * from "./shell.context-menu";

Frontend/src/components/app-shell/data/shell.registry.ts

@@ -0,0 +1,100 @@
+// Path: Frontend/src/components/app-shell/data/shell.registry.ts
+
+import { FileText, LayoutGrid } from "../../../lib/icons";
+import type {
+	ShellIcon,
+	WorkspaceContextMenuAction,
+	WorkspaceContextMenuTarget,
+	WorkspaceItemTypeDefinition,
+	WorkspaceItemTypeId,
+	WorkspaceTreeNode,
+} from "./shell.types";
+
+export const firstPartyWorkspaceItemTypes: readonly WorkspaceItemTypeDefinition[] = [
+	{
+		id: "core.doc",
+		label: "Doc",
+		shortLabel: "Doc",
+		icon: FileText,
+		noun: "doc",
+		actionPrefix: "doc",
+		defaultCreateLabel: "New doc",
+		includeInWorkspaceCreate: true,
+		description: "Rich text documents and notes.",
+	},
+	{
+		id: "core.board.kanban",
+		label: "Kanban board",
+		shortLabel: "Board",
+		icon: LayoutGrid,
+		noun: "board",
+		actionPrefix: "board",
+		defaultCreateLabel: "New board",
+		includeInWorkspaceCreate: true,
+		description: "Default board-style workspace item.",
+	},
+	{
+		id: "core.board.list",
+		label: "List board",
+		shortLabel: "Board",
+		icon: LayoutGrid,
+		noun: "board",
+		actionPrefix: "list-board",
+		defaultCreateLabel: "New list board",
+		description: "Alternate first-party board view prepared for the future registry.",
+	},
+] as const;
+
+const workspaceItemTypeMap = new Map<WorkspaceItemTypeId, WorkspaceItemTypeDefinition>(
+	firstPartyWorkspaceItemTypes.map((definition) => [definition.id, definition]),
+);
+
+const createUnknownWorkspaceItemTypeDefinition = (
+	itemType: WorkspaceItemTypeId,
+): WorkspaceItemTypeDefinition => ({
+	id: itemType,
+	label: "Item",
+	shortLabel: "Item",
+	icon: FileText,
+	noun: "item",
+	actionPrefix: "item",
+	defaultCreateLabel: "New item",
+	description: "Fallback definition for unknown or future workspace item types.",
+});
+
+export const getWorkspaceItemTypeDefinition = (itemType: WorkspaceItemTypeId): WorkspaceItemTypeDefinition => {
+	return workspaceItemTypeMap.get(itemType) ?? createUnknownWorkspaceItemTypeDefinition(itemType);
+};
+
+export const getWorkspaceNodeIcon = (node: WorkspaceTreeNode): ShellIcon =>
+	node.kind === "folder" ? node.icon : getWorkspaceItemTypeDefinition(node.itemType).icon;
+
+export const getWorkspaceCreateActions = (): readonly WorkspaceContextMenuAction[] => [
+	{ id: "new-folder", label: "New folder", shortcut: { modifiers: ["alt"], key: "f" } },
+	...firstPartyWorkspaceItemTypes
+		.filter((definition) => definition.includeInWorkspaceCreate)
+		.map((definition) => ({
+			id: `create-${definition.actionPrefix}`,
+			label: definition.defaultCreateLabel,
+			shortcut:
+				definition.id === "core.board.kanban"
+					? ({ modifiers: ["alt"], key: "b" } as const)
+					: definition.id === "core.doc"
+						? ({ modifiers: ["alt"], key: "d" } as const)
+						: undefined,
+		})),
+];
+
+export const getWorkspaceContextMenuEyebrow = (target: WorkspaceContextMenuTarget): string => {
+	switch (target.kind) {
+		case "workspace":
+		case "home":
+			return "Workspace";
+		case "settings":
+			return "Configuration";
+		case "folder":
+			return "Folder";
+		case "item":
+			return getWorkspaceItemTypeDefinition(target.itemType).shortLabel;
+	}
+};

Frontend/src/components/app-shell/data/shell.scaffold.ts

@@ -0,0 +1,222 @@
+// Path: Frontend/src/components/app-shell/data/shell.scaffold.ts
+
+import {
+	Bell,
+	CircleHelp,
+	FileText,
+	Folder,
+	Home,
+	Keyboard,
+	LayoutGrid,
+	ListCollapse,
+	LogOut,
+	Repeat,
+	Search,
+	Settings,
+	Shield,
+	User,
+} from "../../../lib/icons";
+import type {
+	ActiveDepartment,
+	ActiveProject,
+	ActiveServer,
+	ActiveUserProfile,
+	DepartmentItem,
+	MobileBottomNavItem,
+	NotificationItem,
+	ProfileMenuSection,
+	ProjectItem,
+	RailItem,
+	ServerDockAction,
+	SidebarHeaderAction,
+	TopBarAction,
+	WorkspaceStaticItem,
+	WorkspaceTreeNode,
+} from "./shell.types";
+
+export const personalDockActions: readonly ServerDockAction[] = [
+	{ id: "account", label: "Account", icon: User },
+	{ id: "settings", label: "Settings", icon: Settings },
+] as const;
+
+export const organizationAdminDockActions: readonly ServerDockAction[] = [
+	{ id: "members", label: "Members", icon: User },
+	{ id: "server", label: "Server", icon: Settings },
+] as const;
+
+export const railItems: readonly RailItem[] = [
+	{ id: "personal-server", label: "Personal Server Name", abbreviation: "P", kind: "personal" },
+	{ id: "organization-server", label: "Organization Name", abbreviation: "O", kind: "organization", active: true },
+	{ id: "design-review", label: "Design Review", abbreviation: "D", kind: "organization" },
+] as const;
+
+export const activeServer: ActiveServer = {
+	id: "organization-server",
+	name: "Organization Name",
+	abbreviation: "O",
+	kind: "organization",
+	connectedLabel: "12 connected",
+	dockActions: organizationAdminDockActions,
+};
+
+export const activeProject: ActiveProject = {
+	id: "general",
+	name: "General",
+};
+
+export const activeDepartment: ActiveDepartment = {
+	id: "product",
+	name: "Product",
+	teamName: "Design Systems",
+};
+
+export const projectItems: readonly ProjectItem[] = [
+	{
+		id: "general",
+		name: "General",
+		description: "Default shared project",
+		groupLabel: "Shared space",
+		parentLabel: "Workspace home",
+		meta: "1 workspace",
+		active: true,
+	},
+	{
+		id: "operations",
+		name: "Operations",
+		description: "Cross-team planning and delivery",
+		groupLabel: "Team folders",
+		parentLabel: "Shared Services",
+		meta: "2 workspaces",
+	},
+	{
+		id: "hiring",
+		name: "Hiring",
+		description: "Candidate pipeline and interview loops",
+		groupLabel: "Team folders",
+		parentLabel: "People Ops",
+		meta: "1 workspace",
+	},
+] as const;
+
+export const departmentItems: readonly DepartmentItem[] = [
+	{ id: "product", name: "Product", teams: ["Design Systems", "Research Ops"], active: true },
+	{ id: "engineering", name: "Engineering", teams: ["Platform", "Realtime Collaboration"] },
+	{ id: "operations", name: "Operations", teams: ["Shared Services", "People Ops"] },
+] as const;
+
+export const workspaceStaticItems: readonly WorkspaceStaticItem[] = [
+	{ id: "home", label: "Home", icon: Home, active: true, contextKind: "home" },
+	{ id: "workspace-settings", label: "Settings", icon: Settings, contextKind: "settings" },
+] as const;
+
+export const workspaceTree: readonly WorkspaceTreeNode[] = [
+	{
+		id: "product-workspace",
+		label: "Product",
+		kind: "folder",
+		icon: Folder,
+		children: [
+			{ id: "roadmap-board", label: "Roadmap", kind: "item", itemType: "core.board.kanban", active: true },
+			{ id: "launch-brief", label: "Launch Brief", kind: "item", itemType: "core.doc" },
+			{
+				id: "research-folder",
+				label: "Research",
+				kind: "folder",
+				icon: Folder,
+				children: [
+					{ id: "interviews-doc", label: "Interviews", kind: "item", itemType: "core.doc" },
+					{ id: "signals-board", label: "Signals", kind: "item", itemType: "core.board.kanban", meta: "2" },
+				],
+			},
+		],
+	},
+	{
+		id: "design-folder",
+		label: "Design",
+		kind: "folder",
+		icon: Folder,
+		children: [
+			{ id: "system-doc", label: "Design System", kind: "item", itemType: "core.doc" },
+			{ id: "review-board", label: "Review Queue", kind: "item", itemType: "core.board.kanban" },
+		],
+	},
+	{ id: "general-notes", label: "General Notes", kind: "item", itemType: "core.doc" },
+] as const;
+
+export const workspaceSidebarHeaderActions: readonly SidebarHeaderAction[] = [
+	{ id: "search-workspace", label: "Search workspace", icon: Search },
+	{ id: "toggle-workspace-folders", label: "Collapse all folders", icon: ListCollapse },
+] as const;
+
+export const mobileBottomNavItems: readonly MobileBottomNavItem[] = [
+	{ id: "home", label: "Home", icon: Home, active: true },
+	{ id: "search", label: "Search", icon: Search },
+	{ id: "browse", label: "Browse", icon: Folder },
+] as const;
+
+export const topBarActions: readonly TopBarAction[] = [{ id: "search", label: "Search", icon: Search }] as const;
+
+export const notificationItems: readonly NotificationItem[] = [
+	{
+		id: "comment-design-systems",
+		title: "New comment on Design Systems",
+		contextLabel: "Product • Review thread updated",
+		timeLabel: "2m ago",
+		unread: true,
+	},
+	{
+		id: "sprint-platform",
+		title: "Sprint updated in Platform",
+		contextLabel: "Engineering • Scope changed",
+		timeLabel: "15m ago",
+		unread: true,
+	},
+	{
+		id: "member-joined",
+		title: "New member joined Operations",
+		contextLabel: "Organization Name • Access granted",
+		timeLabel: "1h ago",
+	},
+	{
+		id: "daily-summary",
+		title: "Daily summary is ready",
+		contextLabel: "General • 8 updates across boards",
+		timeLabel: "Today, 8:00 AM",
+	},
+] as const;
+
+export const unreadNotificationCount = notificationItems.filter((item) => item.unread).length;
+
+export const activeUserProfile: ActiveUserProfile = {
+	name: "Demo Account",
+	email: "demo@moku.work",
+	roleLabel: "Founder · Product",
+	contextLabel: "Organization Name • Design Systems",
+};
+
+export const profileMenuSections: readonly ProfileMenuSection[] = [
+	{
+		id: "account",
+		items: [
+			{ id: "profile", label: "Profile", icon: User },
+			{ id: "account-settings", label: "Account Settings", icon: Settings },
+			{ id: "notifications", label: "Notifications", icon: Bell },
+			{ id: "security", label: "Security", icon: Shield },
+		],
+	},
+	{
+		id: "preferences",
+		items: [
+			{ id: "keyboard-shortcuts", label: "Keyboard Shortcuts", icon: Keyboard },
+			{ id: "theme-preferences", label: "Theme Preferences", icon: Settings },
+			{ id: "help-support", label: "Help & Support", icon: CircleHelp },
+		],
+	},
+	{
+		id: "session",
+		items: [
+			{ id: "switch-account", label: "Switch Account", icon: Repeat },
+			{ id: "sign-out", label: "Sign Out", icon: LogOut, tone: "danger" },
+		],
+	},
+] as const;

Frontend/src/components/app-shell/data/shell.types.ts

@@ -0,0 +1,233 @@
+// Path: Frontend/src/components/app-shell/data/shell.types.ts
+
+import type { Component } from "solid-js";
+
+export type ShellIconProps = {
+	class?: string;
+	size?: number;
+	strokeWidth?: number;
+};
+
+export type ShellIcon = Component<ShellIconProps>;
+
+export type RailItem = {
+	id: string;
+	label: string;
+	abbreviation: string;
+	kind: "personal" | "organization";
+	active?: boolean;
+};
+
+export type ServerDockAction = {
+	id: string;
+	label: string;
+	icon: ShellIcon;
+};
+
+export type ActiveServer = {
+	id: string;
+	name: string;
+	abbreviation: string;
+	kind: "personal" | "organization";
+	connectedLabel?: string;
+	subtitle?: string;
+	dockActions: readonly ServerDockAction[];
+};
+
+export type ActiveProject = {
+	id: string;
+	name: string;
+};
+
+export type ActiveDepartment = {
+	id: string;
+	name: string;
+	teamName: string;
+};
+
+export type DepartmentItem = {
+	id: string;
+	name: string;
+	teams: readonly string[];
+	active?: boolean;
+};
+
+export type ProjectItem = {
+	id: string;
+	name: string;
+	description: string;
+	groupLabel?: string;
+	parentLabel?: string;
+	meta?: string;
+	active?: boolean;
+};
+
+export type ProjectMenuTarget =
+	| {
+		id: string;
+		label: string;
+		kind: "surface";
+	  }
+	| {
+		id: string;
+		label: string;
+		kind: "folder";
+	  }
+	| {
+		id: string;
+		label: string;
+		kind: "project";
+	  };
+
+export type ProjectContextMenuAction = {
+	id: string;
+	label: string;
+	tone?: "default" | "danger";
+	shortcut?: WorkspaceContextMenuShortcut;
+	children?: readonly ProjectContextMenuAction[];
+};
+
+export type ProjectContextMenuSection = {
+	id: string;
+	label?: string;
+	items: readonly ProjectContextMenuAction[];
+};
+
+export type SidebarItem = {
+	id: string;
+	label: string;
+	icon: ShellIcon;
+	active?: boolean;
+	meta?: string;
+};
+
+export type WorkspaceStaticKind = "workspace" | "home" | "settings";
+
+export type WorkspaceItemTypeId = string;
+
+export type WorkspaceStaticItem = SidebarItem & {
+	contextKind: WorkspaceStaticKind;
+};
+
+export type WorkspaceFolderNode = {
+	id: string;
+	path?: string;
+	label: string;
+	kind: "folder";
+	icon: ShellIcon;
+	active?: boolean;
+	meta?: string;
+	children?: readonly WorkspaceTreeNode[];
+};
+
+export type WorkspaceItemNode = {
+	id: string;
+	path?: string;
+	label: string;
+	kind: "item";
+	itemType: WorkspaceItemTypeId;
+	active?: boolean;
+	meta?: string;
+	children?: undefined;
+};
+
+export type WorkspaceTreeNode = WorkspaceFolderNode | WorkspaceItemNode;
+
+export type WorkspaceItemTypeDefinition = {
+	id: WorkspaceItemTypeId;
+	label: string;
+	shortLabel: string;
+	icon: ShellIcon;
+	noun: string;
+	actionPrefix: string;
+	defaultCreateLabel: string;
+	includeInWorkspaceCreate?: boolean;
+	description?: string;
+};
+
+export type SidebarHeaderAction = {
+	id: string;
+	label: string;
+	icon: ShellIcon;
+};
+
+export type TopBarAction = {
+	id: string;
+	label: string;
+	icon: ShellIcon;
+};
+
+export type MobileBottomNavItem = {
+	id: string;
+	label: string;
+	icon: ShellIcon;
+	active?: boolean;
+};
+
+export type WorkspaceContextMenuTarget =
+	| {
+		id: string;
+		label: string;
+		kind: WorkspaceStaticKind;
+	  }
+	| {
+		id: string;
+		label: string;
+		kind: "folder";
+	  }
+	| {
+		id: string;
+		label: string;
+		kind: "item";
+		itemType: WorkspaceItemTypeId;
+	  };
+
+export type WorkspaceContextMenuAction = {
+	id: string;
+	label: string;
+	tone?: "default" | "danger";
+	shortcut?: WorkspaceContextMenuShortcut;
+	children?: readonly WorkspaceContextMenuAction[];
+};
+
+export type WorkspaceContextMenuShortcutModifier = "meta" | "alt" | "shift";
+
+export type WorkspaceContextMenuShortcutKey = "b" | "c" | "d" | "delete" | "enter" | "f" | "m" | "r";
+
+export type WorkspaceContextMenuShortcut = {
+	modifiers?: readonly WorkspaceContextMenuShortcutModifier[];
+	key: WorkspaceContextMenuShortcutKey;
+};
+
+export type WorkspaceContextMenuSection = {
+	id: string;
+	label?: string;
+	items: readonly WorkspaceContextMenuAction[];
+};
+
+export type NotificationItem = {
+	id: string;
+	title: string;
+	contextLabel: string;
+	timeLabel: string;
+	unread?: boolean;
+};
+
+export type ProfileMenuAction = {
+	id: string;
+	label: string;
+	icon: ShellIcon;
+	tone?: "default" | "danger";
+};
+
+export type ProfileMenuSection = {
+	id: string;
+	items: readonly ProfileMenuAction[];
+};
+
+export type ActiveUserProfile = {
+	name: string;
+	email: string;
+	roleLabel: string;
+	contextLabel: string;
+};

Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.data.ts

@@ -1,4 +1,4 @@
-// Path: Frontend/src/components/workspace-home/WorkspaceHome/WorkspaceHome.data.ts
+// Path: Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.data.ts
 
 export type BootstrapStepKey = "persona" | "instance" | "mode" | "admin" | "structure";
 

Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.hook.ts

@@ -1,8 +1,7 @@
-// Path: Frontend/src/components/workspace-home/WorkspaceHome/WorkspaceHome.hook.ts
+// Path: Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.hook.ts
 
 import { createEffect, createMemo, createSignal, onCleanup } from "solid-js";
 import { createStore } from "solid-js/store";
-import { resolveAPIBase } from "../../../lib/api";
 import {
 	bootstrapPersonaDefinitions,
 	bootstrapStepDefinitions,
@@ -20,7 +19,8 @@ import {
 	type InstanceForm,
 	type ModeForm,
 	type StructureForm,
-} from "./WorkspaceHome.data";
+} from "./BootstrapWizard.data";
+import { submitBootstrapStepRequest } from "./bootstrapWizard.api";
 
 type AppShellBootstrapAdapter = {
 	installation: () => { isBootstrapped?: boolean; materializationStatus?: string; materializationError?: string } | undefined;
@@ -49,67 +49,7 @@ const initialSubmissionState = (): BootstrapSubmissionState => ({
 
 const materializationPollIntervalMs = 2000;
 
-const readResponseBody = async (response: Response): Promise<unknown> => {
-	const raw = await response.text();
-
-	if (!raw.trim()) {
-		return null;
-	}
-
-	try {
-		return JSON.parse(raw);
-	} catch {
-		return raw;
-	}
-};
-
-const readResponseError = (step: BootstrapStepKey, data: unknown): string => {
-	const fallback = `Bootstrap ${step} request failed.`;
-
-	if (typeof data === "string") {
-		const message = data.trim();
-		return message || fallback;
-	}
-
-	if (!data || typeof data !== "object") {
-		return fallback;
-	}
-
-	const record = data as {
-		error?: string;
-		message?: string;
-		requestId?: string;
-	};
-	const message = typeof record.message === "string" ? record.message.trim() : "";
-	const errorCode = typeof record.error === "string" ? record.error.trim() : "";
-	const requestId = typeof record.requestId === "string" ? record.requestId.trim() : "";
-
-	if (!message && !errorCode && !requestId) {
-		return fallback;
-	}
-
-	const details: string[] = [];
-
-	if (errorCode) {
-		details.push(`code: ${errorCode}`);
-	}
-
-	if (requestId) {
-		details.push(`request: ${requestId}`);
-	}
-
-	if (message && details.length > 0) {
-		return `${message} (${details.join(", ")})`;
-	}
-
-	if (message) {
-		return message;
-	}
-
-	return `${fallback} (${details.join(", ")})`;
-};
-
-export const useWorkspaceHomeWizard = (appShellData: AppShellBootstrapAdapter) => {
+export const useBootstrapWizard = (appShellData: AppShellBootstrapAdapter) => {
 	const [instanceForm, setInstanceForm] = createStore<InstanceForm>({ ...defaultInstanceForm });
 	const [modeForm, setModeForm] = createStore<ModeForm>({ ...defaultModeForm });
 	const [adminForm, setAdminForm] = createStore<AdminForm>({ ...defaultAdminForm });
@@ -303,7 +243,6 @@ export const useWorkspaceHomeWizard = (appShellData: AppShellBootstrapAdapter) =
 		});
 	});
 
-	const apiBase = (): string => resolveAPIBase();
 	const bootstrapNamePlaceholder = (): string => personaDefinition().defaults.namePlaceholder;
 	const bootstrapStepCount = createMemo(() => activeWizardSteps().length);
 	const currentStep = createMemo<BootstrapStepDefinition>(() => activeBootstrapSteps()[currentStepIndex()] ?? activeBootstrapSteps()[0] ?? bootstrapStepDefinitions[0]!);
@@ -342,19 +281,7 @@ export const useWorkspaceHomeWizard = (appShellData: AppShellBootstrapAdapter) =
 		setStepState(step, { status: "submitting", error: "" });
 
 		try {
-			const response = await fetch(`${apiBase()}/bootstrap/steps/${step}`, {
-				method: "POST",
-				headers: {
-					"Content-Type": "application/json",
-					Accept: "application/json",
-				},
-				body: JSON.stringify(payload),
-			});
-			const data = await readResponseBody(response);
-
-			if (!response.ok) {
-				throw new Error(readResponseError(step, data));
-			}
+			await submitBootstrapStepRequest(step, payload);
 
 			setStepState(step, {
 				status: "success",

Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.module.scss

@@ -1,4 +1,4 @@
-/* Path: Frontend/src/components/workspace-home/WorkspaceHome/WorkspaceHome.module.scss */
+/* Path: Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.module.scss */
 
 .viewport,
 .wizardLayer {

Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.parts.tsx

@@ -1,3 +1,5 @@
+// Path: Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.parts.tsx
+
 import { For, Show, type JSX } from "solid-js";
 import { CircleHelp } from "../../../lib/icons";
 import {
@@ -11,8 +13,8 @@ import {
 	type InstanceForm,
 	type ModeForm,
 	type StructureForm,
-} from "./WorkspaceHome.data";
-import styles from "./WorkspaceHome.module.scss";
+} from "./BootstrapWizard.data";
+import styles from "./BootstrapWizard.module.scss";
 
 type BootstrapSubmissionState = {
 	status: "idle" | "submitting" | "success" | "error";

Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizard.tsx

@@ -0,0 +1,107 @@
+import { type JSX } from "solid-js";
+import { useAppShellData } from "../../app-shell/data/app-shell.context";
+import { useBootstrapWizard } from "./BootstrapWizard.hook";
+import { BootstrapWizardDialog } from "./BootstrapWizardDialog";
+
+export const BootstrapWizard = (): JSX.Element => {
+	const appShellData = useAppShellData();
+	const {
+		instanceForm,
+		setInstanceForm,
+		modeForm,
+		setModeForm,
+		adminForm,
+		setAdminForm,
+		structureForm,
+		setStructureForm,
+		selectedPersona,
+		hasChosenPersona,
+		stepState,
+		isBootstrapStateResolved,
+		isWizardOpen,
+		setIsWizardOpen,
+		setIsFinishingBootstrapFlow,
+		fieldTooltip,
+		materializationState,
+		isMaterializationInFlight,
+		hasMaterializationFailed,
+		showBootstrapFinishingState,
+		materializationStatusLabel,
+		materializationMessage,
+		selectedPersonaIsAvailable,
+		usesCondensedBootstrapFlow,
+		activeWizardSteps,
+		bootstrapNamePlaceholder,
+		bootstrapStepCount,
+		currentStep,
+		currentWizardStepIndex,
+		wizardProgressFillWidth,
+		currentStepState,
+		isFirstStep,
+		canDismissWizard,
+		handleCurrentStepSubmit,
+		applyPersonaSelection,
+		statusLabel,
+		showFieldTooltip,
+		hideFieldTooltip,
+		stepStatusLabel,
+		navigateBack,
+		navigateToVisibleStep,
+	} = useBootstrapWizard(appShellData);
+
+	return (
+		<BootstrapWizardDialog
+			isOpen={isBootstrapStateResolved() && isWizardOpen()}
+			currentStep={currentStep()}
+			currentStepState={currentStepState()}
+			activeWizardSteps={activeWizardSteps()}
+			currentWizardStepIndex={currentWizardStepIndex()}
+			stepState={stepState}
+			bootstrapStepCount={bootstrapStepCount()}
+			wizardProgressFillWidth={wizardProgressFillWidth()}
+			showBootstrapFinishingState={showBootstrapFinishingState()}
+			materializationState={materializationState()}
+			materializationStatusLabel={materializationStatusLabel()}
+			materializationMessage={materializationMessage()}
+			isMaterializationInFlight={isMaterializationInFlight()}
+			hasMaterializationFailed={hasMaterializationFailed()}
+			instanceForm={instanceForm}
+			modeForm={modeForm}
+			adminForm={adminForm}
+			structureForm={structureForm}
+			selectedPersona={selectedPersona()}
+			hasChosenPersona={hasChosenPersona()}
+			selectedPersonaIsAvailable={selectedPersonaIsAvailable()}
+			usesCondensedBootstrapFlow={usesCondensedBootstrapFlow()}
+			bootstrapNamePlaceholder={bootstrapNamePlaceholder()}
+			isFirstStep={isFirstStep()}
+			canDismissWizard={canDismissWizard()}
+			fieldTooltip={fieldTooltip()}
+			onClose={(): void => {
+				setIsWizardOpen(false);
+			}}
+			onCloseFinishingState={(): void => {
+				setIsFinishingBootstrapFlow(false);
+				setIsWizardOpen(false);
+			}}
+			onSubmit={handleCurrentStepSubmit}
+			onSelectPersona={applyPersonaSelection}
+			onProtocolChange={(value): void => setInstanceForm("protocol", value)}
+			onAccessChange={(value): void => setInstanceForm("access", value)}
+			onHostChange={(value): void => setInstanceForm("host", value)}
+			onModeNameChange={(value): void => setModeForm("name", value)}
+			onProjectNameChange={(value): void => setStructureForm("projectName", value)}
+			onTeamNameChange={(value): void => setStructureForm("teamName", value)}
+			onAdminDisplayNameChange={(value): void => setAdminForm("displayName", value)}
+			onAdminEmailChange={(value): void => setAdminForm("email", value)}
+			onAdminPasswordChange={(value): void => setAdminForm("password", value)}
+			onDepartmentNameChange={(value): void => setStructureForm("departmentName", value)}
+			onShowTooltip={showFieldTooltip}
+			onHideTooltip={hideFieldTooltip}
+			statusLabel={statusLabel}
+			stepStatusLabel={stepStatusLabel}
+			onNavigateBack={navigateBack}
+			onSelectStep={navigateToVisibleStep}
+		/>
+	);
+};

Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizardDialog.tsx

@@ -0,0 +1,234 @@
+// Path: Frontend/src/components/bootstrap/BootstrapWizard/BootstrapWizardDialog.tsx
+
+import { Show, type JSX } from "solid-js";
+import { Portal } from "solid-js/web";
+import {
+	type AdminForm,
+	type BootstrapPersona,
+	bootstrapPersonaDefinitions,
+	type BootstrapStepDefinition,
+	type BootstrapStepKey,
+	type InstanceForm,
+	type ModeForm,
+	type StructureForm,
+} from "./BootstrapWizard.data";
+import { type BootstrapSubmissionState, type FieldTooltipState, type MaterializationState } from "./BootstrapWizard.hook";
+import {
+	BootstrapAdminStep,
+	BootstrapFinishingState,
+	BootstrapInstanceStep,
+	BootstrapModeStep,
+	BootstrapPersonaStep,
+	BootstrapStructureStep,
+	BootstrapWizardProgress,
+} from "./BootstrapWizard.parts";
+import styles from "./BootstrapWizard.module.scss";
+
+export type BootstrapWizardDialogProps = {
+	isOpen: boolean;
+	currentStep: BootstrapStepDefinition;
+	currentStepState: BootstrapSubmissionState;
+	activeWizardSteps: readonly BootstrapStepDefinition[];
+	currentWizardStepIndex: number;
+	stepState: Record<BootstrapStepKey, BootstrapSubmissionState>;
+	bootstrapStepCount: number;
+	wizardProgressFillWidth: string;
+	showBootstrapFinishingState: boolean;
+	materializationState: MaterializationState;
+	materializationStatusLabel: string;
+	materializationMessage: string;
+	isMaterializationInFlight: boolean;
+	hasMaterializationFailed: boolean;
+	instanceForm: InstanceForm;
+	modeForm: ModeForm;
+	adminForm: AdminForm;
+	structureForm: StructureForm;
+	selectedPersona: BootstrapPersona;
+	hasChosenPersona: boolean;
+	selectedPersonaIsAvailable: boolean;
+	usesCondensedBootstrapFlow: boolean;
+	bootstrapNamePlaceholder: string;
+	isFirstStep: boolean;
+	canDismissWizard: boolean;
+	fieldTooltip: FieldTooltipState | null;
+	onClose: () => void;
+	onCloseFinishingState: () => void;
+	onSubmit: JSX.EventHandlerUnion<HTMLFormElement, SubmitEvent>;
+	onSelectPersona: (persona: BootstrapPersona) => void;
+	onProtocolChange: (value: InstanceForm["protocol"]) => void;
+	onAccessChange: (value: InstanceForm["access"]) => void;
+	onHostChange: (value: string) => void;
+	onModeNameChange: (value: string) => void;
+	onProjectNameChange: (value: string) => void;
+	onTeamNameChange: (value: string) => void;
+	onAdminDisplayNameChange: (value: string) => void;
+	onAdminEmailChange: (value: string) => void;
+	onAdminPasswordChange: (value: string) => void;
+	onDepartmentNameChange: (value: string) => void;
+	onShowTooltip: (target: HTMLElement, text: string) => void;
+	onHideTooltip: () => void;
+	statusLabel: (state: BootstrapSubmissionState) => string;
+	stepStatusLabel: (step: BootstrapStepDefinition) => string;
+	onNavigateBack: () => void;
+	onSelectStep: (index: number) => void;
+};
+
+export const BootstrapWizardDialog = (props: BootstrapWizardDialogProps): JSX.Element => (
+	<Show when={props.isOpen}>
+		<Portal>
+			<div class={styles.wizardLayer} data-ui="bootstrap-wizard" data-step={props.currentStep.id}>
+				<div class={styles.wizardBackdrop} aria-hidden="true" />
+
+				<section class={styles.wizardPanel} role="dialog" aria-modal="true" aria-labelledby="bootstrap-wizard-title" data-slot="bootstrap-wizard-panel">
+					<header class={styles.wizardHeader} data-slot="bootstrap-wizard-header">
+						<div class={styles.wizardHeaderCopy}>
+							<h2 id="bootstrap-wizard-title" class={styles.wizardTitle}>
+								Bootstrap Server
+							</h2>
+						</div>
+						<Show when={props.canDismissWizard}>
+							<button type="button" class={styles.wizardCloseButton} onClick={props.onClose}>
+								Close
+							</button>
+						</Show>
+					</header>
+
+					<Show
+						when={!props.showBootstrapFinishingState}
+						fallback={
+							<BootstrapFinishingState
+								materializationState={props.materializationState}
+								statusLabel={props.materializationStatusLabel}
+								message={props.materializationMessage}
+								isInFlight={props.isMaterializationInFlight}
+								hasFailed={props.hasMaterializationFailed}
+								onClose={props.onCloseFinishingState}
+							/>
+						}
+					>
+						<div class={styles.wizardBody}>
+							<Show when={props.currentStep.id !== "persona"}>
+								<BootstrapWizardProgress
+									steps={props.activeWizardSteps}
+									currentStepId={props.currentStep.id}
+									currentWizardStepIndex={props.currentWizardStepIndex}
+									stepState={props.stepState}
+									bootstrapStepCount={props.bootstrapStepCount}
+									wizardProgressFillWidth={props.wizardProgressFillWidth}
+									stepStatusLabel={props.stepStatusLabel}
+									onSelectStep={props.onSelectStep}
+								/>
+							</Show>
+
+							<div class={styles.wizardStepPanel} data-slot="bootstrap-wizard-step-panel">
+								<Show when={props.currentStep.id !== "persona" || props.statusLabel(props.currentStepState)}>
+									<div class={styles.sectionHeader}>
+										<Show when={props.currentStep.id !== "persona"}>
+											<div>
+												<span class={styles.wizardStepEyebrow}>{`Step ${props.currentWizardStepIndex + 1} of ${props.bootstrapStepCount}`}</span>
+											</div>
+										</Show>
+										<Show when={props.statusLabel(props.currentStepState)}>
+											<div class={styles.statusBadge} data-status={props.currentStepState.status}>
+												{props.statusLabel(props.currentStepState)}
+											</div>
+										</Show>
+									</div>
+								</Show>
+
+								<form class={styles.form} onSubmit={props.onSubmit}>
+									<Show when={props.currentStep.id === "persona"}>
+										<BootstrapPersonaStep
+											personas={bootstrapPersonaDefinitions}
+											hasChosenPersona={props.hasChosenPersona}
+											selectedPersona={props.selectedPersona}
+											selectedPersonaIsAvailable={props.selectedPersonaIsAvailable}
+											onSelectPersona={props.onSelectPersona}
+										/>
+									</Show>
+
+									<Show when={props.currentStep.id === "instance"}>
+										<BootstrapInstanceStep
+											instanceForm={props.instanceForm}
+											onProtocolChange={props.onProtocolChange}
+											onAccessChange={props.onAccessChange}
+											onHostChange={props.onHostChange}
+											onShowTooltip={props.onShowTooltip}
+											onHideTooltip={props.onHideTooltip}
+										/>
+									</Show>
+
+									<Show when={props.currentStep.id === "mode"}>
+										<BootstrapModeStep
+											modeForm={props.modeForm}
+											structureForm={props.structureForm}
+											usesCondensedBootstrapFlow={props.usesCondensedBootstrapFlow}
+											selectedPersona={props.selectedPersona}
+											namePlaceholder={props.bootstrapNamePlaceholder}
+											onNameChange={props.onModeNameChange}
+											onProjectNameChange={props.onProjectNameChange}
+											onTeamNameChange={props.onTeamNameChange}
+											onShowTooltip={props.onShowTooltip}
+											onHideTooltip={props.onHideTooltip}
+										/>
+									</Show>
+
+									<Show when={props.currentStep.id === "admin"}>
+										<BootstrapAdminStep
+											adminForm={props.adminForm}
+											onDisplayNameChange={props.onAdminDisplayNameChange}
+											onEmailChange={props.onAdminEmailChange}
+											onPasswordChange={props.onAdminPasswordChange}
+										/>
+									</Show>
+
+									<Show when={props.currentStep.id === "structure"}>
+										<BootstrapStructureStep
+											mode={props.modeForm.mode}
+											structureForm={props.structureForm}
+											onDepartmentNameChange={props.onDepartmentNameChange}
+											onTeamNameChange={props.onTeamNameChange}
+											onProjectNameChange={props.onProjectNameChange}
+											onShowTooltip={props.onShowTooltip}
+											onHideTooltip={props.onHideTooltip}
+										/>
+									</Show>
+
+									<Show when={props.currentStep.id !== "persona"}>
+										<div class={styles.wizardFormActions}>
+											<button type="button" class={styles.secondaryButton} disabled={props.isFirstStep} onClick={props.onNavigateBack}>
+												Back
+											</button>
+											<button type="submit" class={styles.primaryButton} disabled={props.currentStepState.status === "submitting"}>
+												{props.currentStep.buttonLabel}
+											</button>
+										</div>
+									</Show>
+								</form>
+
+								<Show when={props.currentStepState.error}>
+									<p class={styles.errorText}>{props.currentStepState.error}</p>
+								</Show>
+							</div>
+						</div>
+					</Show>
+				</section>
+
+				<Show when={props.fieldTooltip}>
+					{(tooltip): JSX.Element => (
+						<div
+							class={styles.fieldTooltip}
+							data-placement={tooltip().placement}
+							style={{
+								left: `${tooltip().left}px`,
+								top: `${tooltip().top}px`,
+							}}
+						>
+							<div class={styles.fieldTooltipBubble}>{tooltip().text}</div>
+						</div>
+					)}
+				</Show>
+			</div>
+		</Portal>
+	</Show>
+);

Frontend/src/components/bootstrap/BootstrapWizard/bootstrapWizard.api.ts

@@ -0,0 +1,81 @@
+import { resolveAPIBase } from "../../../lib/api";
+import type { BootstrapStepKey } from "./BootstrapWizard.data";
+
+const readBootstrapResponseBody = async (response: Response): Promise<unknown> => {
+	const raw = await response.text();
+
+	if (!raw.trim()) {
+		return null;
+	}
+
+	try {
+		return JSON.parse(raw);
+	} catch {
+		return raw;
+	}
+};
+
+const readBootstrapResponseError = (step: BootstrapStepKey, data: unknown): string => {
+	const fallback = `Bootstrap ${step} request failed.`;
+
+	if (typeof data === "string") {
+		const message = data.trim();
+		return message || fallback;
+	}
+
+	if (!data || typeof data !== "object") {
+		return fallback;
+	}
+
+	const record = data as {
+		error?: string;
+		message?: string;
+		requestId?: string;
+	};
+	const message = typeof record.message === "string" ? record.message.trim() : "";
+	const errorCode = typeof record.error === "string" ? record.error.trim() : "";
+	const requestId = typeof record.requestId === "string" ? record.requestId.trim() : "";
+
+	if (!message && !errorCode && !requestId) {
+		return fallback;
+	}
+
+	const details: string[] = [];
+
+	if (errorCode) {
+		details.push(`code: ${errorCode}`);
+	}
+
+	if (requestId) {
+		details.push(`request: ${requestId}`);
+	}
+
+	if (message && details.length > 0) {
+		return `${message} (${details.join(", ")})`;
+	}
+
+	if (message) {
+		return message;
+	}
+
+	return `${fallback} (${details.join(", ")})`;
+};
+
+export const submitBootstrapStepRequest = async (
+	step: BootstrapStepKey,
+	payload: unknown,
+): Promise<void> => {
+	const response = await fetch(`${resolveAPIBase()}/bootstrap/steps/${step}`, {
+		method: "POST",
+		headers: {
+			"Content-Type": "application/json",
+			Accept: "application/json",
+		},
+		body: JSON.stringify(payload),
+	});
+	const data = await readBootstrapResponseBody(response);
+
+	if (!response.ok) {
+		throw new Error(readBootstrapResponseError(step, data));
+	}
+};

Frontend/src/components/shell/MobileWorkspaceBrowser/MobileWorkspaceBrowser.tsx

@@ -1,638 +0,0 @@
-import { For, Show, createSignal, type JSX } from "solid-js";
-import { Portal } from "solid-js/web";
-import { ChevronRight, Plus, X } from "../../../lib/icons";
-import { useAppShellData } from "../data/app-shell.context";
-import { createLongPressGesture } from "../createLongPressGesture";
-import {
-	createWorkspaceStaticTarget,
-	createWorkspaceSurfaceTarget,
-	createWorkspaceTreeTarget,
-	getWorkspaceItemTypeDefinition,
-	getWorkspaceNodeIcon,
-	workspaceStaticItems,
-	type SidebarItem,
-	type WorkspaceContextMenuAction,
-	type WorkspaceContextMenuTarget,
-	type WorkspaceItemTypeId,
-	type WorkspaceStaticItem,
-	type WorkspaceTreeNode,
-} from "../data/shell.data";
-import { useWorkspaceTreeData } from "../shared/useWorkspaceTreeData";
-import { WorkspaceMobileActionSheet } from "../WorkspaceMobileActionSheet/WorkspaceMobileActionSheet";
-import styles from "./MobileWorkspaceBrowser.module.scss";
-
-type MobileWorkspaceBrowserProps = {
-	open: boolean;
-	onClose: VoidFunction;
-};
-
-type MobileWorkspaceDialogState =
-	| {
-			kind: "text";
-			title: string;
-			message: string;
-			confirmLabel: string;
-			initialValue: string;
-			onConfirm: (value: string) => void;
-	  }
-	| {
-			kind: "confirm";
-			title: string;
-			message: string;
-			confirmLabel: string;
-			tone?: "danger";
-			onConfirm: () => void;
-	  };
-
-type MobileMoveTargetState = {
-	kind: "folder" | "item";
-	id: string;
-	label: string;
-};
-
-type MobileMoveDestination = {
-	id: string | null;
-	label: string;
-	depth: number;
-	meta?: string;
-};
-
-const collectMoveDestinations = (
-	nodes: readonly WorkspaceTreeNode[],
-	movingTarget: MobileMoveTargetState,
-	depth = 0,
-	ancestorBlocked = false,
-): MobileMoveDestination[] => {
-	const destinations: MobileMoveDestination[] = [];
-
-	for (const node of nodes) {
-		if (node.kind !== "folder") {
-			continue;
-		}
-
-		const isBlockedFolder = movingTarget.kind === "folder" && node.id === movingTarget.id;
-		if (!ancestorBlocked && !isBlockedFolder) {
-			destinations.push({
-				id: node.id,
-				label: node.label,
-				depth,
-				meta: "Folder",
-			});
-		}
-
-		destinations.push(
-			...collectMoveDestinations(node.children ?? [], movingTarget, depth + 1, ancestorBlocked || isBlockedFolder),
-		);
-	}
-
-	return destinations;
-};
-
-const findTreeNodeById = (nodes: readonly WorkspaceTreeNode[], nodeId: string): WorkspaceTreeNode | null => {
-	for (const node of nodes) {
-		if (node.id === nodeId) {
-			return node;
-		}
-
-		if (node.kind !== "folder") {
-			continue;
-		}
-
-		const nestedMatch = findTreeNodeById(node.children ?? [], nodeId);
-		if (nestedMatch) {
-			return nestedMatch;
-		}
-	}
-
-	return null;
-};
-
-const isDangerDialogState = (state: MobileWorkspaceDialogState): boolean => state.kind === "confirm" && state.tone === "danger";
-
-const TreeRow = (props: { node: WorkspaceTreeNode; depth?: number }): JSX.Element => {
-	const depth = props.depth ?? 0;
-	const Icon = getWorkspaceNodeIcon(props.node);
-	const hasChildren = (props.node.children?.length ?? 0) > 0;
-
-	return (
-		<button
-			classList={{
-				[styles.treeRow]: true,
-				[styles.treeRowActive]: props.node.active ?? false,
-				[styles.treeRowBranch]: hasChildren,
-			}}
-			type="button"
-			style={{ "--tree-depth": `${depth}` }}
-			data-slot="mobile-workspace-tree-row"
-			data-kind={props.node.kind}
-			data-item-type={props.node.kind === "item" ? props.node.itemType : undefined}
-			data-active={props.node.active ? "true" : "false"}
-		>
-			<span class={styles.treeRowLead}>
-				<Icon size={16} strokeWidth={2} />
-				<span class={styles.treeLabel}>{props.node.label}</span>
-			</span>
-
-			<span class={styles.treeRowTrail}>
-				<Show when={props.node.meta}>
-					<span class={styles.treeMeta}>{props.node.meta}</span>
-				</Show>
-				<Show when={hasChildren}>
-					<ChevronRight size={14} strokeWidth={2} class={styles.treeChevron} />
-				</Show>
-			</span>
-		</button>
-	);
-};
-
-const StaticRow = (props: { item: SidebarItem }): JSX.Element => {
-	const Icon = props.item.icon;
-
-	return (
-		<button classList={{ [styles.treeRow]: true, [styles.treeRowActive]: props.item.active ?? false }} type="button" style={{ "--tree-depth": "0" }} data-slot="mobile-workspace-static-row" data-active={props.item.active ? "true" : "false"}>
-			<span class={styles.treeRowLead}>
-				<Icon size={16} strokeWidth={2} />
-				<span class={styles.treeLabel}>{props.item.label}</span>
-			</span>
-			<span class={styles.treeRowTrail}>
-				<Show when={props.item.meta}>
-					<span class={styles.treeMeta}>{props.item.meta}</span>
-				</Show>
-				<ChevronRight size={14} strokeWidth={2} class={styles.treeChevron} />
-			</span>
-		</button>
-	);
-};
-
-const WorkspaceStaticRow = (props: {
-	item: WorkspaceStaticItem;
-	onOpenActionSheet: (target: WorkspaceContextMenuTarget) => void;
-}): JSX.Element => {
-	const target = createWorkspaceStaticTarget(props.item);
-	const longPress = createLongPressGesture({
-		onLongPress: () => {
-			props.onOpenActionSheet(target);
-		},
-	});
-
-	return (
-		<li
-			class={styles.treeListItem}
-			data-slot="mobile-workspace-static-item"
-			data-target-kind={target.kind}
-			onContextMenu={(event): void => {
-				event.preventDefault();
-				props.onOpenActionSheet(target);
-			}}
-			{...longPress}
-		>
-			<StaticRow item={props.item} />
-		</li>
-	);
-};
-
-const WorkspaceTreeBranch = (props: {
-	nodes: readonly WorkspaceTreeNode[];
-	depth?: number;
-	onOpenActionSheet: (target: WorkspaceContextMenuTarget) => void;
-}): JSX.Element => {
-	const depth = props.depth ?? 0;
-
-	return (
-		<For each={props.nodes}>
-			{(node): JSX.Element => {
-				const target = createWorkspaceTreeTarget(node);
-				const longPress = createLongPressGesture({
-					onLongPress: () => {
-						props.onOpenActionSheet(target);
-					},
-				});
-
-				return (
-					<li
-						class={styles.treeListItem}
-						data-slot="mobile-workspace-tree-item"
-						data-kind={node.kind}
-						data-item-type={node.kind === "item" ? node.itemType : undefined}
-						onContextMenu={(event): void => {
-							event.preventDefault();
-							props.onOpenActionSheet(target);
-						}}
-						{...longPress}
-					>
-						<TreeRow node={node} depth={depth} />
-
-						<Show when={node.children?.length}>
-							<ul class={styles.treeListNested}>
-								<WorkspaceTreeBranch nodes={node.children ?? []} depth={depth + 1} onOpenActionSheet={props.onOpenActionSheet} />
-							</ul>
-						</Show>
-					</li>
-				);
-			}}
-		</For>
-	);
-};
-
-export const MobileWorkspaceBrowser = (props: MobileWorkspaceBrowserProps): JSX.Element => {
-	const appShellData = useAppShellData();
-	const [actionSheetTarget, setActionSheetTarget] = createSignal<WorkspaceContextMenuTarget | null>(null);
-	const [dialogState, setDialogState] = createSignal<MobileWorkspaceDialogState | null>(null);
-	const [dialogValue, setDialogValue] = createSignal("");
-	const [moveTarget, setMoveTarget] = createSignal<MobileMoveTargetState | null>(null);
-	const { workspaceTreeNodes, createFolder, renameFolder, deleteFolder, moveFolder, createItem, deleteItem, moveItem } = useWorkspaceTreeData({
-		activeProjectId: () => appShellData.activeProject().id,
-		fallbackWorkspaceTree: () => appShellData.workspaceTree(),
-	});
-	const workspaceTarget = () => createWorkspaceSurfaceTarget(appShellData.activeProject());
-
-	const moveDestinations = () => {
-		const target = moveTarget();
-		if (!target) {
-			return [] as MobileMoveDestination[];
-		}
-
-		return [
-			{ id: null, label: "Items root", depth: 0, meta: "Root" },
-			...collectMoveDestinations(workspaceTreeNodes(), target),
-		];
-	};
-
-	const resolveCreateItemType = (actionId: string): WorkspaceItemTypeId | null => {
-		switch (actionId) {
-			case "create-doc":
-				return "core.doc";
-			case "create-board":
-				return "core.board.kanban";
-			case "create-list-board":
-				return "core.board.list";
-			default:
-				return null;
-		}
-	};
-
-	const createPersistedItem = (itemType: WorkspaceItemTypeId, parentId: string | null): void => {
-		const definition = getWorkspaceItemTypeDefinition(itemType);
-		void createItem(definition.defaultCreateLabel, itemType, parentId);
-	};
-
-	const openActionSheet = (target: WorkspaceContextMenuTarget): void => {
-		setActionSheetTarget(target);
-	};
-
-	const closeActionSheet = (): void => {
-		setActionSheetTarget(null);
-	};
-
-	const closeMoveSheet = (): void => {
-		setMoveTarget(null);
-	};
-
-	const openWorkspaceActionSheet = (): void => {
-		openActionSheet(workspaceTarget());
-	};
-
-	const closeDialog = (): void => {
-		setDialogState(null);
-		setDialogValue("");
-	};
-
-	const openMoveSheet = (target: MobileMoveTargetState): void => {
-		setMoveTarget(target);
-	};
-
-	const openTextDialog = (config: Omit<Extract<MobileWorkspaceDialogState, { kind: "text" }>, "kind">): void => {
-		setDialogValue(config.initialValue);
-		setDialogState({ kind: "text", ...config });
-	};
-
-	const openConfirmDialog = (config: Omit<Extract<MobileWorkspaceDialogState, { kind: "confirm" }>, "kind">): void => {
-		setDialogValue("");
-		setDialogState({ kind: "confirm", ...config });
-	};
-
-	const submitDialog = (): void => {
-		const state = dialogState();
-		if (!state) {
-			return;
-		}
-
-		if (state.kind === "text") {
-			const value = dialogValue().trim();
-			if (!value) {
-				return;
-			}
-
-			closeDialog();
-			state.onConfirm(value);
-			return;
-		}
-
-		closeDialog();
-		state.onConfirm();
-	};
-
-	const handleMoveDestinationSelect = (destinationId: string | null): void => {
-		const target = moveTarget();
-		if (!target) {
-			return;
-		}
-
-		const destinationNode = destinationId ? findTreeNodeById(workspaceTreeNodes(), destinationId) : null;
-		const targetIndex = destinationNode?.kind === "folder"
-			? destinationNode.children?.length ?? 0
-			: destinationId
-				? 0
-				: workspaceTreeNodes().length;
-
-		closeMoveSheet();
-
-		if (target.kind === "folder") {
-			void moveFolder(target.id, destinationId, targetIndex);
-			return;
-		}
-
-		void moveItem(target.id, destinationId, targetIndex);
-	};
-
-	const handleActionSelect = (action: WorkspaceContextMenuAction, target: WorkspaceContextMenuTarget): void => {
-		const createItemType = resolveCreateItemType(action.id);
-		if (createItemType) {
-			switch (target.kind) {
-				case "workspace":
-				case "home":
-					createPersistedItem(createItemType, null);
-					return;
-				case "folder":
-					createPersistedItem(createItemType, target.id);
-					return;
-				case "settings":
-				case "item":
-					return;
-			}
-		}
-
-		switch (action.id) {
-			case "new-folder": {
-				if (target.kind === "settings" || target.kind === "item") {
-					return;
-				}
-
-				openTextDialog({
-					title: "New folder",
-					message: target.kind === "folder" ? `Create a folder inside "${target.label}".` : "Create a folder at the root of Items.",
-					confirmLabel: "Create",
-					initialValue: "Untitled folder",
-					onConfirm: (name) => {
-						void createFolder(name, target.kind === "folder" ? target.id : null);
-					},
-				});
-				return;
-			}
-			case "rename-folder": {
-				if (target.kind !== "folder") {
-					return;
-				}
-
-				openTextDialog({
-					title: "Rename folder",
-					message: `Update the name for "${target.label}".`,
-					confirmLabel: "Save",
-					initialValue: target.label,
-					onConfirm: (name) => {
-						if (name === target.label) {
-							return;
-						}
-						void renameFolder(target.id, name);
-					},
-				});
-				return;
-			}
-			case "move-folder": {
-				if (target.kind !== "folder") {
-					return;
-				}
-
-				openMoveSheet({
-					kind: "folder",
-					id: target.id,
-					label: target.label,
-				});
-				return;
-			}
-			case "delete-folder": {
-				if (target.kind !== "folder") {
-					return;
-				}
-
-				openConfirmDialog({
-					title: "Delete folder?",
-					message: `"${target.label}" and everything inside it will be removed.`,
-					confirmLabel: "Delete",
-					tone: "danger",
-					onConfirm: () => {
-						void deleteFolder(target.id);
-					},
-				});
-				return;
-			}
-			case "move-doc":
-			case "move-board":
-			case "move-list-board": {
-				if (target.kind !== "item") {
-					return;
-				}
-
-				openMoveSheet({
-					kind: "item",
-					id: target.id,
-					label: target.label,
-				});
-				return;
-			}
-			case "delete-doc":
-			case "delete-board":
-			case "delete-list-board": {
-				if (target.kind !== "item") {
-					return;
-				}
-
-				openConfirmDialog({
-					title: "Delete item?",
-					message: `"${target.label}" will be removed from the project tree.`,
-					confirmLabel: "Delete",
-					tone: "danger",
-					onConfirm: () => {
-						void deleteItem(target.id);
-					},
-				});
-				return;
-			}
-			default:
-				return;
-		}
-	};
-
-	const workspaceLongPress = createLongPressGesture({
-		onLongPress: openWorkspaceActionSheet,
-	});
-
-	return (
-		<Show when={props.open}>
-			<div class={styles.browserLayer} data-ui="mobile-workspace-browser">
-				<section class={styles.sheet} aria-label="Mobile workspace browser" data-slot="mobile-workspace-sheet">
-					<header class={styles.sheetHeader} data-slot="mobile-workspace-header">
-						<div
-							class={styles.brandBlock}
-							data-slot="mobile-workspace-brand"
-							onContextMenu={(event): void => {
-								event.preventDefault();
-								openWorkspaceActionSheet();
-							}}
-							{...workspaceLongPress}
-						>
-							{/* Long-pressing the browser header exposes workspace-level actions on mobile. */}
-							<span class={styles.brandEyebrow}>Moku Work</span>
-							<strong class={styles.brandTitle}>{appShellData.activeProject().name}</strong>
-							<span class={styles.brandContext}>{appShellData.activeServer().name}</span>
-						</div>
-
-						<div class={styles.headerActions} data-slot="mobile-workspace-header-actions">
-							<button
-								class={styles.createButton}
-								type="button"
-								aria-label="Create"
-								data-slot="mobile-workspace-create"
-								onClick={openWorkspaceActionSheet}
-							>
-								<Plus size={16} strokeWidth={2.25} />
-								<span>Create</span>
-							</button>
-
-							<button class={styles.closeButton} type="button" aria-label="Close workspace browser" data-slot="mobile-workspace-close" onClick={props.onClose}>
-								<X size={18} strokeWidth={2} />
-							</button>
-						</div>
-					</header>
-
-					<div class={styles.sheetBody} data-slot="mobile-workspace-body">
-						<section class={styles.sectionBlock} data-slot="mobile-workspace-section" data-section-id="workspace">
-							<span class={styles.sectionLabel}>Workspace</span>
-							<ul class={styles.treeList} data-slot="mobile-workspace-list" data-section-id="workspace">
-								<For each={workspaceStaticItems}>
-									{(item): JSX.Element => <WorkspaceStaticRow item={item} onOpenActionSheet={openActionSheet} />}
-								</For>
-							</ul>
-						</section>
-
-						<section class={styles.sectionBlock} data-slot="mobile-workspace-section" data-section-id="items">
-							<span class={styles.sectionLabel}>Items</span>
-							<ul class={styles.treeList} data-slot="mobile-workspace-list" data-section-id="items">
-								<WorkspaceTreeBranch nodes={workspaceTreeNodes()} onOpenActionSheet={openActionSheet} />
-							</ul>
-						</section>
-					</div>
-				</section>
-
-				<WorkspaceMobileActionSheet target={actionSheetTarget()} onClose={closeActionSheet} onSelect={handleActionSelect} />
-
-				<Show when={moveTarget()}>
-					{(state): JSX.Element => (
-						<Portal>
-							<div class={styles.moveSheetLayer} data-ui="mobile-workspace-move-sheet">
-								<button class={styles.dialogBackdrop} type="button" aria-label="Close move sheet" onClick={closeMoveSheet} />
-								<section class={styles.moveSheet} aria-label={`Move ${state().label}`}>
-									<div class={styles.moveSheetHandle} aria-hidden="true" />
-									<div class={styles.moveSheetHeader}>
-										<div class={styles.moveSheetHeaderCopy}>
-											<span class={styles.moveSheetEyebrow}>Move {state().kind}</span>
-											<strong class={styles.moveSheetTitle}>{state().label}</strong>
-											<p class={styles.moveSheetMessage}>Choose a new location in the project tree.</p>
-										</div>
-									</div>
-
-									<div class={styles.moveSection}>
-										<span class={styles.moveSectionLabel}>Destination</span>
-										<div class={styles.moveDestinationList}>
-											<For each={moveDestinations()}>
-												{(destination): JSX.Element => (
-													<button
-														type="button"
-														class={styles.moveDestinationButton}
-														style={{ "--move-depth": `${destination.depth}` }}
-														onClick={(): void => handleMoveDestinationSelect(destination.id)}
-													>
-														<span class={styles.moveDestinationLabel}>{destination.label}</span>
-														<Show when={destination.meta}>
-															<span class={styles.moveDestinationMeta}>{destination.meta}</span>
-														</Show>
-													</button>
-												)}
-											</For>
-										</div>
-									</div>
-
-									<div class={styles.moveSheetFooter}>
-										<button class={styles.dialogSecondaryButton} type="button" onClick={closeMoveSheet}>
-											Cancel
-										</button>
-									</div>
-								</section>
-							</div>
-						</Portal>
-					)}
-				</Show>
-
-				<Show when={dialogState()}>
-					{(state): JSX.Element => (
-						<Portal>
-							<div class={styles.dialogLayer} data-ui="mobile-workspace-dialog">
-								<button class={styles.dialogBackdrop} type="button" aria-label="Close dialog" onClick={closeDialog} />
-								<section class={styles.dialogCard} aria-label={state().title}>
-									<div class={styles.dialogCopy}>
-										<strong class={styles.dialogTitle}>{state().title}</strong>
-										<p class={styles.dialogMessage}>{state().message}</p>
-									</div>
-
-									<Show when={state().kind === "text"}>
-										<input
-											class={styles.dialogInput}
-											type="text"
-											value={dialogValue()}
-											onInput={(event): void => {
-												setDialogValue(event.currentTarget.value);
-											}}
-											onKeyDown={(event): void => {
-												if (event.key === "Enter") {
-													event.preventDefault();
-													submitDialog();
-												}
-											}}
-											autofocus
-										/>
-									</Show>
-
-									<div class={styles.dialogActions}>
-										<button class={styles.dialogSecondaryButton} type="button" onClick={closeDialog}>
-											Cancel
-										</button>
-										<button
-											classList={{
-												[styles.dialogPrimaryButton]: true,
-												[styles.dialogDangerButton]: isDangerDialogState(state()),
-											}}
-											type="button"
-											onClick={submitDialog}
-										>
-											{state().confirmLabel}
-										</button>
-									</div>
-								</section>
-							</div>
-						</Portal>
-					)}
-				</Show>
-			</div>
-		</Show>
-	);
-};

Frontend/src/components/shell/data/app-shell.context.tsx

@@ -1,375 +0,0 @@
-// Path: Frontend/src/components/shell/data/app-shell.context.tsx
-
-import {
-	createContext,
-	createMemo,
-	createSignal,
-	onMount,
-	useContext,
-	type Accessor,
-	type JSX,
-} from "solid-js";
-import { Folder } from "../../../lib/icons";
-import { resolveAPIBase } from "../../../lib/api";
-import {
-	activeDepartment as fallbackActiveDepartment,
-	activeProject as fallbackActiveProject,
-	activeServer as fallbackActiveServer,
-	activeUserProfile as fallbackActiveUserProfile,
-	departmentItems as fallbackDepartmentItems,
-	organizationAdminDockActions,
-	personalDockActions,
-	projectItems as fallbackProjectItems,
-	railItems as fallbackRailItems,
-	workspaceTree as fallbackWorkspaceTree,
-	type ActiveDepartment,
-	type ActiveProject,
-	type ActiveServer,
-	type ActiveUserProfile,
-	type DepartmentItem,
-	type ProjectItem,
-	type RailItem,
-	type WorkspaceTreeNode,
-} from "./shell.data";
-
-type AppShellInstallation = {
-	id: string;
-	name: string;
-	mode: "personal" | "organizational" | string;
-	access: string;
-	protocol: string;
-	host: string;
-	isBootstrapped: boolean;
-	materializationStatus: "not_started" | "pending" | "running" | "succeeded" | "failed" | string;
-	materializationError?: string;
-};
-
-type AppShellAdmin = {
-	id: string;
-	email: string;
-	displayName: string;
-	isInstanceAdmin: boolean;
-	homeTitle: string;
-};
-
-type AppShellOrganization = {
-	id: string;
-	name: string;
-	slug: string;
-};
-
-type AppShellDepartment = {
-	id: string;
-	organizationId: string;
-	name: string;
-	slug: string;
-};
-
-type AppShellTeam = {
-	id: string;
-	organizationId: string;
-	departmentId?: string;
-	name: string;
-	slug: string;
-};
-
-type AppShellProject = {
-	id: string;
-	organizationId: string;
-	departmentId?: string;
-	teamId?: string;
-	name: string;
-	slug: string;
-};
-
-type AppShellWorkspace = {
-	id: string;
-	organizationId: string;
-	name: string;
-	slug: string;
-	kind: "organization" | "department" | "team" | "project" | string;
-	departmentId?: string;
-	teamId?: string;
-	projectId?: string;
-};
-
-type AppShellPayload = {
-	installation?: AppShellInstallation;
-	admin?: AppShellAdmin;
-	organizations: AppShellOrganization[];
-	departments: AppShellDepartment[];
-	teams: AppShellTeam[];
-	projects: AppShellProject[];
-	workspaces: AppShellWorkspace[];
-};
-
-const normalizeInstallation = (
-	installation: AppShellInstallation | null | undefined,
-): AppShellInstallation | undefined => {
-	if (!installation) {
-		return undefined;
-	}
-
-	const materializationStatus = installation.materializationStatus?.trim()
-		? installation.materializationStatus
-		: installation.isBootstrapped
-			? "succeeded"
-			: "not_started";
-	const materializationError = installation.materializationError?.trim() || undefined;
-
-	return {
-		...installation,
-		materializationStatus,
-		materializationError,
-	};
-};
-
-const normalizeAppShellPayload = (payload: AppShellPayload | null | undefined): AppShellPayload => ({
-	installation: normalizeInstallation(payload?.installation),
-	admin: payload?.admin,
-	organizations: Array.isArray(payload?.organizations) ? payload.organizations : [],
-	departments: Array.isArray(payload?.departments) ? payload.departments : [],
-	teams: Array.isArray(payload?.teams) ? payload.teams : [],
-	projects: Array.isArray(payload?.projects) ? payload.projects : [],
-	workspaces: Array.isArray(payload?.workspaces) ? payload.workspaces : [],
-});
-
-type AppShellContextValue = {
-	status: Accessor<"idle" | "loading" | "success" | "error">;
-	error: Accessor<string>;
-	installation: Accessor<AppShellInstallation | undefined>;
-	railItems: Accessor<readonly RailItem[]>;
-	activeServer: Accessor<ActiveServer>;
-	activeProject: Accessor<ActiveProject>;
-	activeDepartment: Accessor<ActiveDepartment>;
-	projectItems: Accessor<readonly ProjectItem[]>;
-	departmentItems: Accessor<readonly DepartmentItem[]>;
-	workspaceTree: Accessor<readonly WorkspaceTreeNode[]>;
-	activeUserProfile: Accessor<ActiveUserProfile>;
-	reload: () => Promise<void>;
-};
-
-const AppShellContext = createContext<AppShellContextValue>();
-
-const buildAbbreviation = (name: string, fallback: string): string => {
-	const parts = name
-		.trim()
-		.split(/\s+/)
-		.filter(Boolean);
-
-	if (parts.length === 0) {
-		return fallback;
-	}
-
-	const abbreviation = parts
-		.slice(0, 2)
-		.map((part) => part[0]?.toUpperCase() ?? "")
-		.join("");
-
-	return abbreviation || fallback;
-};
-
-const buildRailItems = (payload: AppShellPayload | null): readonly RailItem[] => {
-	if (!payload?.installation || payload.organizations.length === 0) {
-		return fallbackRailItems;
-	}
-
-	const kind = payload.installation.mode === "personal" ? "personal" : "organization";
-	const serverName = payload.installation.name || payload.organizations[0]?.name || payload.installation.host;
-
-	return payload.organizations.map((organization, index) => ({
-		id: organization.id,
-		label: serverName || organization.name,
-		abbreviation: buildAbbreviation(serverName || organization.name, kind === "personal" ? "P" : "O"),
-		kind,
-		active: index === 0,
-	}));
-};
-
-const buildActiveServer = (payload: AppShellPayload | null): ActiveServer => {
-	const installation = payload?.installation;
-	const organization = payload?.organizations[0];
-
-	if (!installation || !organization) {
-		return fallbackActiveServer;
-	}
-
-	const kind = installation.mode === "personal" ? "personal" : "organization";
-	const serverName = installation.name || organization.name || installation.host;
-
-	return {
-		id: installation.id,
-		name: serverName || fallbackActiveServer.name,
-		abbreviation: buildAbbreviation(serverName, kind === "personal" ? "P" : "O"),
-		kind,
-		connectedLabel: kind === "organization" ? `${payload?.teams.length ?? 0} connected` : undefined,
-		subtitle: kind === "personal" ? installation.host || payload?.admin?.homeTitle || "Personal home" : undefined,
-		dockActions: kind === "personal" ? personalDockActions : organizationAdminDockActions,
-	};
-};
-
-const buildProjectItems = (payload: AppShellPayload | null): readonly ProjectItem[] => {
-	if (!payload?.projects.length) {
-		return fallbackProjectItems;
-	}
-
-	return payload.projects.map((project, index) => ({
-		id: project.id,
-		name: project.name,
-		description: project.slug || "Persisted project workspace",
-		groupLabel: payload.departments.find((department) => department.id === project.departmentId)?.name || "Projects",
-		parentLabel:
-			payload.teams.find((team) => team.id === project.teamId)?.name ||
-			payload.departments.find((department) => department.id === project.departmentId)?.name ||
-			"Shared project",
-		meta: (() => {
-			const workspaceCount = payload.workspaces.filter((workspace) => workspace.projectId === project.id).length;
-
-			return workspaceCount > 0 ? `${workspaceCount} workspace${workspaceCount === 1 ? "" : "s"}` : undefined;
-		})(),
-		active: index === 0,
-	}));
-};
-
-const buildActiveProject = (payload: AppShellPayload | null): ActiveProject => {
-	const firstProject = payload?.projects[0];
-
-	if (!firstProject) {
-		return fallbackActiveProject;
-	}
-
-	return {
-		id: firstProject.id,
-		name: firstProject.name,
-	};
-};
-
-const buildDepartmentItems = (payload: AppShellPayload | null): readonly DepartmentItem[] => {
-	if (!payload?.departments.length) {
-		return fallbackDepartmentItems;
-	}
-
-	return payload.departments.map((department, index) => ({
-		id: department.id,
-		name: department.name,
-		teams: payload.teams
-			.filter((team) => team.departmentId === department.id)
-			.map((team) => team.name),
-		active: index === 0,
-	}));
-};
-
-const buildActiveDepartment = (payload: AppShellPayload | null): ActiveDepartment => {
-	const firstDepartment = payload?.departments[0];
-
-	if (!firstDepartment) {
-		return fallbackActiveDepartment;
-	}
-
-	const firstTeamName = payload?.teams.find((team) => team.departmentId === firstDepartment.id)?.name ?? "";
-
-	return {
-		id: firstDepartment.id,
-		name: firstDepartment.name,
-		teamName: firstTeamName,
-	};
-};
-
-const buildWorkspaceTree = (payload: AppShellPayload | null): readonly WorkspaceTreeNode[] => {
-	if (!payload?.projects.length) {
-		return fallbackWorkspaceTree;
-	}
-
-	// The workspace tree should represent items inside the current project, not the
-	// project container itself. We do not have project-contents hydration yet, so
-	// return an empty tree rather than showing the project root as a fake item.
-	return [];
-};
-
-const buildActiveUserProfile = (payload: AppShellPayload | null): ActiveUserProfile => {
-	if (!payload?.admin) {
-		return fallbackActiveUserProfile;
-	}
-
-	const organizationName = payload.installation?.name || payload.organizations[0]?.name || fallbackActiveServer.name;
-	const departmentName = payload.departments[0]?.name;
-
-	return {
-		name: payload.admin.displayName,
-		email: payload.admin.email,
-		roleLabel: payload.admin.isInstanceAdmin ? "Instance admin" : "Member",
-		contextLabel: departmentName ? `${organizationName} • ${departmentName}` : organizationName,
-	};
-};
-
-export const AppShellDataProvider = (props: { children: JSX.Element }): JSX.Element => {
-	const [status, setStatus] = createSignal<"idle" | "loading" | "success" | "error">("idle");
-	const [error, setError] = createSignal("");
-	const [payload, setPayload] = createSignal<AppShellPayload | null>(null);
-
-	const load = async (): Promise<void> => {
-		setStatus("loading");
-		setError("");
-
-		try {
-			const response = await fetch(`${resolveAPIBase()}/app-shell`, {
-				headers: {
-					Accept: "application/json",
-				},
-			});
-
-			const body = (await response.json()) as {
-				data?: AppShellPayload;
-				error?: { message?: string } | string;
-				message?: string;
-			};
-			const errorMessage =
-				typeof body.message === "string"
-					? body.message
-					: typeof body.error === "string"
-						? body.error
-						: body.error?.message;
-
-			if (!response.ok || !body.data) {
-				throw new Error(errorMessage || "Failed to load app shell state.");
-			}
-
-			setPayload(normalizeAppShellPayload(body.data));
-			setStatus("success");
-		} catch (loadError) {
-			setStatus("error");
-			setError(loadError instanceof Error ? loadError.message : "Failed to load app shell state.");
-		}
-	};
-
-	onMount(() => {
-		void load();
-	});
-
-	const value: AppShellContextValue = {
-		status,
-		error,
-		installation: createMemo(() => payload()?.installation),
-		railItems: createMemo(() => buildRailItems(payload())),
-		activeServer: createMemo(() => buildActiveServer(payload())),
-		activeProject: createMemo(() => buildActiveProject(payload())),
-		activeDepartment: createMemo(() => buildActiveDepartment(payload())),
-		projectItems: createMemo(() => buildProjectItems(payload())),
-		departmentItems: createMemo(() => buildDepartmentItems(payload())),
-		workspaceTree: createMemo(() => buildWorkspaceTree(payload())),
-		activeUserProfile: createMemo(() => buildActiveUserProfile(payload())),
-		reload: load,
-	};
-
-	return <AppShellContext.Provider value={value}>{props.children}</AppShellContext.Provider>;
-};
-
-export const useAppShellData = (): AppShellContextValue => {
-	const context = useContext(AppShellContext);
-
-	if (!context) {
-		throw new Error("useAppShellData must be used within AppShellDataProvider");
-	}
-
-	return context;
-};

Frontend/src/components/shell/data/shell.data.ts

@@ -1,734 +0,0 @@
-// Path: Frontend/src/components/shell/data/shell.data.ts
-
-import type { Component } from "solid-js";
-import {
-	Bell,
-	CircleHelp,
-	FileText,
-	Folder,
-	Home,
-	Keyboard,
-	LayoutGrid,
-	ListCollapse,
-	LogOut,
-	Repeat,
-	Search,
-	Settings,
-	Shield,
-	User,
-} from "../../../lib/icons";
-
-type ShellIconProps = {
-	class?: string;
-	size?: number;
-	strokeWidth?: number;
-};
-
-export type ShellIcon = Component<ShellIconProps>;
-
-export type RailItem = {
-	id: string;
-	label: string;
-	abbreviation: string;
-	kind: "personal" | "organization";
-	active?: boolean;
-};
-
-export type ServerDockAction = {
-	id: string;
-	label: string;
-	icon: ShellIcon;
-};
-
-export type ActiveServer = {
-	id: string;
-	name: string;
-	abbreviation: string;
-	kind: "personal" | "organization";
-	connectedLabel?: string;
-	subtitle?: string;
-	dockActions: readonly ServerDockAction[];
-};
-
-export type ActiveProject = {
-	id: string;
-	name: string;
-};
-
-export type ActiveDepartment = {
-	id: string;
-	name: string;
-	teamName: string;
-};
-
-export type DepartmentItem = {
-	id: string;
-	name: string;
-	teams: readonly string[];
-	active?: boolean;
-};
-
-export type ProjectItem = {
-	id: string;
-	name: string;
-	description: string;
-	groupLabel?: string;
-	parentLabel?: string;
-	meta?: string;
-	active?: boolean;
-};
-
-export type ProjectMenuTarget =
-	| {
-		id: string;
-		label: string;
-		kind: "surface";
-	  }
-	| {
-		id: string;
-		label: string;
-		kind: "folder";
-	  }
-	| {
-		id: string;
-		label: string;
-		kind: "project";
-	  };
-
-export type ProjectContextMenuAction = {
-	id: string;
-	label: string;
-	tone?: "default" | "danger";
-	shortcut?: WorkspaceContextMenuShortcut;
-	children?: readonly ProjectContextMenuAction[];
-};
-
-export type ProjectContextMenuSection = {
-	id: string;
-	label?: string;
-	items: readonly ProjectContextMenuAction[];
-};
-
-export type SidebarItem = {
-	id: string;
-	label: string;
-	icon: ShellIcon;
-	active?: boolean;
-	meta?: string;
-};
-
-export type WorkspaceStaticKind = "workspace" | "home" | "settings";
-
-// Keep this open-ended so future server-driven or plugin-provided item types do
-// not require a frontend source edit before they can be represented safely.
-export type WorkspaceItemTypeId = string;
-
-export type WorkspaceStaticItem = SidebarItem & {
-	contextKind: WorkspaceStaticKind;
-};
-
-export type WorkspaceFolderNode = {
-	id: string;
-	path?: string;
-	label: string;
-	kind: "folder";
-	icon: ShellIcon;
-	active?: boolean;
-	meta?: string;
-	children?: readonly WorkspaceTreeNode[];
-};
-
-export type WorkspaceItemNode = {
-	id: string;
-	path?: string;
-	label: string;
-	kind: "item";
-	itemType: WorkspaceItemTypeId;
-	active?: boolean;
-	meta?: string;
-	children?: undefined;
-};
-
-export type WorkspaceTreeNode = WorkspaceFolderNode | WorkspaceItemNode;
-
-export type WorkspaceItemTypeDefinition = {
-	id: WorkspaceItemTypeId;
-	label: string;
-	shortLabel: string;
-	icon: ShellIcon;
-	noun: string;
-	actionPrefix: string;
-	defaultCreateLabel: string;
-	includeInWorkspaceCreate?: boolean;
-	description?: string;
-};
-
-export type SidebarHeaderAction = {
-	id: string;
-	label: string;
-	icon: ShellIcon;
-};
-
-export type TopBarAction = {
-	id: string;
-	label: string;
-	icon: ShellIcon;
-};
-
-export type MobileBottomNavItem = {
-	id: string;
-	label: string;
-	icon: ShellIcon;
-	active?: boolean;
-};
-
-export type WorkspaceContextMenuTarget =
-	| {
-		id: string;
-		label: string;
-		kind: WorkspaceStaticKind;
-	  }
-	| {
-		id: string;
-		label: string;
-		kind: "folder";
-	  }
-	| {
-		id: string;
-		label: string;
-		kind: "item";
-		itemType: WorkspaceItemTypeId;
-	  };
-
-export type WorkspaceContextMenuAction = {
-	id: string;
-	label: string;
-	tone?: "default" | "danger";
-	shortcut?: WorkspaceContextMenuShortcut;
-	children?: readonly WorkspaceContextMenuAction[];
-};
-
-export type WorkspaceContextMenuShortcutModifier = "meta" | "alt" | "shift";
-
-export type WorkspaceContextMenuShortcutKey = "b" | "c" | "d" | "delete" | "enter" | "f" | "m" | "r";
-
-export type WorkspaceContextMenuShortcut = {
-	modifiers?: readonly WorkspaceContextMenuShortcutModifier[];
-	key: WorkspaceContextMenuShortcutKey;
-};
-
-export type WorkspaceContextMenuSection = {
-	id: string;
-	label?: string;
-	items: readonly WorkspaceContextMenuAction[];
-};
-
-export const firstPartyWorkspaceItemTypes: readonly WorkspaceItemTypeDefinition[] = [
-	{
-		id: "core.doc",
-		label: "Doc",
-		shortLabel: "Doc",
-		icon: FileText,
-		noun: "doc",
-		actionPrefix: "doc",
-		defaultCreateLabel: "New doc",
-		includeInWorkspaceCreate: true,
-		description: "Rich text documents and notes.",
-	},
-	{
-		id: "core.board.kanban",
-		label: "Kanban board",
-		shortLabel: "Board",
-		icon: LayoutGrid,
-		noun: "board",
-		actionPrefix: "board",
-		defaultCreateLabel: "New board",
-		includeInWorkspaceCreate: true,
-		description: "Default board-style workspace item.",
-	},
-	{
-		id: "core.board.list",
-		label: "List board",
-		shortLabel: "Board",
-		icon: LayoutGrid,
-		noun: "board",
-		actionPrefix: "list-board",
-		defaultCreateLabel: "New list board",
-		description: "Alternate first-party board view prepared for the future registry.",
-	},
-] as const;
-
-const workspaceItemTypeMap = new Map<WorkspaceItemTypeId, WorkspaceItemTypeDefinition>(
-	firstPartyWorkspaceItemTypes.map((definition) => [definition.id, definition]),
-);
-
-const createUnknownWorkspaceItemTypeDefinition = (
-	itemType: WorkspaceItemTypeId,
-): WorkspaceItemTypeDefinition => ({
-	id: itemType,
-	label: "Item",
-	shortLabel: "Item",
-	icon: FileText,
-	noun: "item",
-	actionPrefix: "item",
-	defaultCreateLabel: "New item",
-	description: "Fallback definition for unknown or future workspace item types.",
-});
-
-export const getWorkspaceItemTypeDefinition = (itemType: WorkspaceItemTypeId): WorkspaceItemTypeDefinition => {
-	return workspaceItemTypeMap.get(itemType) ?? createUnknownWorkspaceItemTypeDefinition(itemType);
-};
-
-export const getWorkspaceNodeIcon = (node: WorkspaceTreeNode): ShellIcon =>
-	node.kind === "folder" ? node.icon : getWorkspaceItemTypeDefinition(node.itemType).icon;
-
-const getWorkspaceCreateActions = (): readonly WorkspaceContextMenuAction[] => [
-	{ id: "new-folder", label: "New folder", shortcut: { modifiers: ["alt"], key: "f" } },
-	...firstPartyWorkspaceItemTypes
-		.filter((definition) => definition.includeInWorkspaceCreate)
-		.map((definition) => ({
-			id: `create-${definition.actionPrefix}`,
-			label: definition.defaultCreateLabel,
-			shortcut:
-				definition.id === "core.board.kanban"
-					? ({ modifiers: ["alt"], key: "b" } as const)
-					: definition.id === "core.doc"
-						? ({ modifiers: ["alt"], key: "d" } as const)
-						: undefined,
-		})),
-];
-
-export const getWorkspaceContextMenuEyebrow = (target: WorkspaceContextMenuTarget): string => {
-	switch (target.kind) {
-		case "workspace":
-		case "home":
-			return "Workspace";
-		case "settings":
-			return "Configuration";
-		case "folder":
-			return "Folder";
-		case "item":
-			return getWorkspaceItemTypeDefinition(target.itemType).shortLabel;
-	}
-};
-
-export const createWorkspaceSurfaceTarget = (workspace: ActiveProject): WorkspaceContextMenuTarget => ({
-	id: `workspace-${workspace.id}`,
-	label: workspace.name,
-	kind: "workspace",
-});
-
-export const createWorkspaceStaticTarget = (item: WorkspaceStaticItem): WorkspaceContextMenuTarget => ({
-	id: item.id,
-	label: item.label,
-	kind: item.contextKind,
-});
-
-export const createWorkspaceTreeTarget = (node: WorkspaceTreeNode): WorkspaceContextMenuTarget => ({
-	id: node.id,
-	label: node.label,
-	...(node.kind === "folder"
-		? { kind: "folder" as const }
-		: {
-			kind: "item" as const,
-			itemType: node.itemType,
-		}),
-});
-
-export type NotificationItem = {
-	id: string;
-	title: string;
-	contextLabel: string;
-	timeLabel: string;
-	unread?: boolean;
-};
-
-export type ProfileMenuAction = {
-	id: string;
-	label: string;
-	icon: ShellIcon;
-	tone?: "default" | "danger";
-};
-
-export type ProfileMenuSection = {
-	id: string;
-	items: readonly ProfileMenuAction[];
-};
-
-export type ActiveUserProfile = {
-	name: string;
-	email: string;
-	roleLabel: string;
-	contextLabel: string;
-};
-
-export const personalDockActions: readonly ServerDockAction[] = [
-	{ id: "account", label: "Account", icon: User },
-	{ id: "settings", label: "Settings", icon: Settings },
-] as const;
-
-export const organizationAdminDockActions: readonly ServerDockAction[] = [
-	{ id: "members", label: "Members", icon: User },
-	{ id: "server", label: "Server", icon: Settings },
-] as const;
-
-// Server shell scaffold data
-export const railItems: readonly RailItem[] = [
-	{ id: "personal-server", label: "Personal Server Name", abbreviation: "P", kind: "personal" },
-	{ id: "organization-server", label: "Organization Name", abbreviation: "O", kind: "organization", active: true },
-	{ id: "design-review", label: "Design Review", abbreviation: "D", kind: "organization" },
-] as const;
-
-export const activeServer: ActiveServer = {
-	id: "organization-server",
-	name: "Organization Name",
-	abbreviation: "O",
-	kind: "organization",
-	connectedLabel: "12 connected",
-	dockActions: organizationAdminDockActions,
-};
-
-// Workspace framing scaffold data
-export const activeProject: ActiveProject = {
-	id: "general",
-	name: "General",
-};
-
-export const activeDepartment: ActiveDepartment = {
-	id: "product",
-	name: "Product",
-	teamName: "Design Systems",
-};
-
-export const projectItems: readonly ProjectItem[] = [
-	{
-		id: "general",
-		name: "General",
-		description: "Default shared project",
-		groupLabel: "Shared space",
-		parentLabel: "Workspace home",
-		meta: "1 workspace",
-		active: true,
-	},
-	{
-		id: "operations",
-		name: "Operations",
-		description: "Cross-team planning and delivery",
-		groupLabel: "Team folders",
-		parentLabel: "Shared Services",
-		meta: "2 workspaces",
-	},
-	{
-		id: "hiring",
-		name: "Hiring",
-		description: "Candidate pipeline and interview loops",
-		groupLabel: "Team folders",
-		parentLabel: "People Ops",
-		meta: "1 workspace",
-	},
-] as const;
-
-export const departmentItems: readonly DepartmentItem[] = [
-	{ id: "product", name: "Product", teams: ["Design Systems", "Research Ops"], active: true },
-	{ id: "engineering", name: "Engineering", teams: ["Platform", "Realtime Collaboration"] },
-	{ id: "operations", name: "Operations", teams: ["Shared Services", "People Ops"] },
-] as const;
-
-// Sidebar and topbar scaffold data
-// These static entries stay pinned in both desktop and mobile workspace navigation.
-export const workspaceStaticItems: readonly WorkspaceStaticItem[] = [
-	{ id: "home", label: "Home", icon: Home, active: true, contextKind: "home" },
-	{ id: "workspace-settings", label: "Settings", icon: Settings, contextKind: "settings" },
-] as const;
-
-// Freeform workspace tree scaffold: folders are structural, while non-folder
-// nodes already flow through the future-safe itemType registry seam.
-export const workspaceTree: readonly WorkspaceTreeNode[] = [
-	{
-		id: "product-workspace",
-		label: "Product",
-		kind: "folder",
-		icon: Folder,
-		children: [
-			{ id: "roadmap-board", label: "Roadmap", kind: "item", itemType: "core.board.kanban", active: true },
-			{ id: "launch-brief", label: "Launch Brief", kind: "item", itemType: "core.doc" },
-			{
-				id: "research-folder",
-				label: "Research",
-				kind: "folder",
-				icon: Folder,
-				children: [
-					{ id: "interviews-doc", label: "Interviews", kind: "item", itemType: "core.doc" },
-					{ id: "signals-board", label: "Signals", kind: "item", itemType: "core.board.kanban", meta: "2" },
-				],
-			},
-		],
-	},
-	{
-		id: "design-folder",
-		label: "Design",
-		kind: "folder",
-		icon: Folder,
-		children: [
-			{ id: "system-doc", label: "Design System", kind: "item", itemType: "core.doc" },
-			{ id: "review-board", label: "Review Queue", kind: "item", itemType: "core.board.kanban" },
-		],
-	},
-	{ id: "general-notes", label: "General Notes", kind: "item", itemType: "core.doc" },
-] as const;
-
-export const workspaceSidebarHeaderActions: readonly SidebarHeaderAction[] = [
-	{ id: "search-workspace", label: "Search workspace", icon: Search },
-	{ id: "toggle-workspace-folders", label: "Collapse all folders", icon: ListCollapse },
-] as const;
-
-export const mobileBottomNavItems: readonly MobileBottomNavItem[] = [
-	{ id: "home", label: "Home", icon: Home, active: true },
-	{ id: "search", label: "Search", icon: Search },
-	{ id: "browse", label: "Browse", icon: Folder },
-] as const;
-
-// Initial context-menu IA scaffold. Behavior wiring can evolve later, but the
-// target kinds and action grouping should stay shared across workspace surfaces.
-export const getWorkspaceContextMenuSections = (
-	target: WorkspaceContextMenuTarget,
-): readonly WorkspaceContextMenuSection[] => {
-	const createActions = getWorkspaceCreateActions();
-
-	const createSubmenuAction = {
-		id: "create",
-		label: "Create",
-		children: createActions,
-	} as const;
-
-	switch (target.kind) {
-		case "workspace":
-			return [
-				{
-					id: "create",
-					label: undefined,
-					items: [createSubmenuAction],
-				},
-				{
-					id: "workspace",
-					label: undefined,
-					items: [
-						{ id: "rename-workspace", label: "Rename workspace", shortcut: { key: "enter" } },
-						{ id: "copy-workspace-link", label: "Copy link", shortcut: { modifiers: ["meta"], key: "c" } },
-					],
-				},
-			] as const;
-		case "home":
-			return [
-				{
-					id: "create",
-					label: undefined,
-					items: [createSubmenuAction],
-				},
-				{
-					id: "workspace",
-					label: undefined,
-					items: [{ id: "open-home", label: "Open home", shortcut: { key: "enter" } }],
-				},
-			] as const;
-		case "settings":
-			return [
-				{
-					id: "settings",
-					label: undefined,
-					items: [
-						{ id: "open-settings", label: "Open settings", shortcut: { key: "enter" } },
-						{ id: "copy-settings-link", label: "Copy link", shortcut: { modifiers: ["meta"], key: "c" } },
-					],
-				},
-			] as const;
-		case "folder":
-			return [
-				{
-					id: "open",
-					items: [
-						{ id: "open-folder", label: "Open folder", shortcut: { key: "enter" } },
-						{ id: "rename-folder", label: "Rename", shortcut: { modifiers: ["meta"], key: "r" } },
-					],
-				},
-				{
-					id: "create",
-					label: undefined,
-					items: [createSubmenuAction],
-				},
-				{
-					id: "organize",
-					label: undefined,
-					items: [
-						{ id: "move-folder", label: "Move…", shortcut: { modifiers: ["meta"], key: "m" } },
-						{ id: "delete-folder", label: "Delete", shortcut: { modifiers: ["meta"], key: "delete" }, tone: "danger" },
-					],
-				},
-			] as const;
-		case "item": {
-			const definition = getWorkspaceItemTypeDefinition(target.itemType);
-			const actionPrefix = definition.actionPrefix;
-			const nounLabel = definition.noun;
-
-			return [
-				{
-					id: `${actionPrefix}-primary`,
-					items: [
-						{ id: `open-${actionPrefix}`, label: `Open ${nounLabel}`, shortcut: { key: "enter" } },
-						{ id: `rename-${actionPrefix}`, label: "Rename", shortcut: { modifiers: ["meta"], key: "r" } },
-					],
-				},
-				{
-					id: "organize",
-					label: undefined,
-					items: [
-						{ id: `move-${actionPrefix}`, label: "Move…", shortcut: { modifiers: ["meta"], key: "m" } },
-						{ id: `delete-${actionPrefix}`, label: "Delete", shortcut: { modifiers: ["meta"], key: "delete" }, tone: "danger" },
-					],
-				},
-			] as const;
-		}
-	}
-};
-
-const getProjectCreateActions = (): readonly ProjectContextMenuAction[] =>
-	[
-		{ id: "new-project", label: "New project" },
-		{ id: "new-folder", label: "New folder" },
-	] as const;
-
-const getProjectFolderDangerActions = (): readonly ProjectContextMenuAction[] =>
-	[
-		{ id: "rename-folder", label: "Rename", shortcut: { modifiers: ["meta"], key: "r" } },
-		{ id: "delete-folder", label: "Delete", shortcut: { modifiers: ["meta"], key: "delete" }, tone: "danger" },
-	] as const;
-
-export const createProjectSurfaceTarget = (label = "Projects"): ProjectMenuTarget => ({
-	id: "project-surface",
-	label,
-	kind: "surface",
-});
-
-export const createProjectFolderTarget = (id: string, label: string): ProjectMenuTarget => ({
-	id,
-	label,
-	kind: "folder",
-});
-
-export const createProjectTarget = (project: ProjectItem): ProjectMenuTarget => ({
-	id: project.id,
-	label: project.name,
-	kind: "project",
-});
-
-export const getProjectContextMenuEyebrow = (target: ProjectMenuTarget): string => {
-	switch (target.kind) {
-		case "surface":
-			return "Projects";
-		case "folder":
-			return "Folder";
-		case "project":
-			return "Project";
-	}
-};
-
-export const getProjectContextMenuSections = (target: ProjectMenuTarget): readonly ProjectContextMenuSection[] => {
-	const createActions = getProjectCreateActions();
-
-	switch (target.kind) {
-		case "surface":
-			return [
-				{
-					id: "create",
-					items: createActions,
-				},
-			] as const;
-		case "folder":
-			return [
-				{
-					id: "create",
-					items: createActions,
-				},
-				{
-					id: "organize",
-					items: getProjectFolderDangerActions(),
-				},
-			] as const;
-		case "project":
-			return [
-				{
-					id: "create",
-					items: createActions,
-				},
-			] as const;
-	}
-};
-
-export const topBarActions: readonly TopBarAction[] = [
-	{ id: "search", label: "Search", icon: Search },
-] as const;
-
-export const notificationItems: readonly NotificationItem[] = [
-	{
-		id: "comment-design-systems",
-		title: "New comment on Design Systems",
-		contextLabel: "Product • Review thread updated",
-		timeLabel: "2m ago",
-		unread: true,
-	},
-	{
-		id: "sprint-platform",
-		title: "Sprint updated in Platform",
-		contextLabel: "Engineering • Scope changed",
-		timeLabel: "15m ago",
-		unread: true,
-	},
-	{
-		id: "member-joined",
-		title: "New member joined Operations",
-		contextLabel: "Organization Name • Access granted",
-		timeLabel: "1h ago",
-	},
-	{
-		id: "daily-summary",
-		title: "Daily summary is ready",
-		contextLabel: "General • 8 updates across boards",
-		timeLabel: "Today, 8:00 AM",
-	},
-] as const;
-
-export const unreadNotificationCount = notificationItems.filter((item) => item.unread).length;
-
-export const activeUserProfile: ActiveUserProfile = {
-	name: "Demo Account",
-	email: "demo@moku.work",
-	roleLabel: "Founder · Product",
-	contextLabel: "Organization Name • Design Systems",
-};
-
-export const profileMenuSections: readonly ProfileMenuSection[] = [
-	{
-		id: "account",
-		items: [
-			{ id: "profile", label: "Profile", icon: User },
-			{ id: "account-settings", label: "Account Settings", icon: Settings },
-			{ id: "notifications", label: "Notifications", icon: Bell },
-			{ id: "security", label: "Security", icon: Shield },
-		],
-	},
-	{
-		id: "preferences",
-		items: [
-			{ id: "keyboard-shortcuts", label: "Keyboard Shortcuts", icon: Keyboard },
-			{ id: "theme-preferences", label: "Theme Preferences", icon: Settings },
-			{ id: "help-support", label: "Help & Support", icon: CircleHelp },
-		],
-	},
-	{
-		id: "session",
-		items: [
-			{ id: "switch-account", label: "Switch Account", icon: Repeat },
-			{ id: "sign-out", label: "Sign Out", icon: LogOut, tone: "danger" },
-		],
-	},
-] as const;

Frontend/src/components/shell/shared/useWorkspaceTreeData.ts

@@ -1,393 +0,0 @@
-import { createEffect, createSignal, type Accessor, type Setter } from "solid-js";
-import { resolveAPIBase } from "../../../lib/api";
-import { Folder } from "../../../lib/icons";
-import type { WorkspaceItemTypeId, WorkspaceTreeNode } from "../data/shell.data";
-import { isUuidString } from "./navTreeDnd";
-
-type PersistedWorkspaceTreeNodeRecord = {
-	id: string;
-	path: string;
-	label: string;
-	kind: "folder" | "item";
-	itemType?: string;
-	children?: PersistedWorkspaceTreeNodeRecord[];
-};
-
-type WorkspaceTreeResponse = {
-	data?: {
-		nodes?: PersistedWorkspaceTreeNodeRecord[];
-	};
-	error?: string;
-	message?: string;
-};
-
-type WorkspaceMutationResponse = {
-	error?: string;
-	message?: string;
-};
-
-const buildPersistedWorkspaceTreeNodes = (
-	nodes: readonly PersistedWorkspaceTreeNodeRecord[],
-): WorkspaceTreeNode[] =>
-	nodes.map((node) =>
-		node.kind === "folder"
-			? {
-				id: node.id,
-				path: node.path,
-				label: node.label,
-				kind: "folder",
-				icon: Folder,
-				children: buildPersistedWorkspaceTreeNodes(node.children ?? []),
-			}
-			: {
-				id: node.id,
-				path: node.path,
-				label: node.label,
-				kind: "item",
-				itemType: node.itemType ?? "core.board.kanban",
-			}
-	);
-
-const readPersistedWorkspaceTreeNodes = (body: WorkspaceTreeResponse): PersistedWorkspaceTreeNodeRecord[] =>
-	Array.isArray(body.data?.nodes) ? body.data.nodes : [];
-
-const findNodeById = (nodes: readonly WorkspaceTreeNode[], nodeId: string): WorkspaceTreeNode | null => {
-	for (const node of nodes) {
-		if (node.id === nodeId) {
-			return node;
-		}
-
-		if (node.kind !== "folder") {
-			continue;
-		}
-
-		const nestedMatch = findNodeById(node.children ?? [], nodeId);
-		if (nestedMatch) {
-			return nestedMatch;
-		}
-	}
-
-	return null;
-};
-
-type UseWorkspaceTreeDataOptions = {
-	activeProjectId: Accessor<string>;
-	fallbackWorkspaceTree: Accessor<readonly WorkspaceTreeNode[]>;
-};
-
-type UseWorkspaceTreeDataResult = {
-	workspaceTreeNodes: Accessor<readonly WorkspaceTreeNode[]>;
-	setWorkspaceTreeNodes: Setter<readonly WorkspaceTreeNode[]>;
-	resolveFolderPath: (folderId: string) => string | null;
-	resolveItemPath: (itemId: string) => string | null;
-	createFolder: (name: string, parentId: string | null) => Promise<boolean>;
-	renameFolder: (folderId: string, name: string) => Promise<boolean>;
-	deleteFolder: (folderId: string) => Promise<boolean>;
-	moveFolder: (folderId: string, parentId: string | null, targetIndex: number) => Promise<boolean>;
-	createItem: (name: string, itemType: WorkspaceItemTypeId, parentId: string | null) => Promise<boolean>;
-	deleteItem: (itemId: string) => Promise<boolean>;
-	moveItem: (itemId: string, parentId: string | null, targetIndex: number) => Promise<boolean>;
-};
-
-export const useWorkspaceTreeData = (
-	options: UseWorkspaceTreeDataOptions,
-): UseWorkspaceTreeDataResult => {
-	const [persistedNodes, setPersistedNodes] = createSignal<readonly PersistedWorkspaceTreeNodeRecord[]>([]);
-	const [workspaceTreeNodes, setWorkspaceTreeNodes] = createSignal<readonly WorkspaceTreeNode[]>(
-		options.fallbackWorkspaceTree(),
-	);
-	let latestPersistedTreeRequest = 0;
-
-	const syncWorkspaceTree = (): void => {
-		const nextTree = options.activeProjectId()
-			? buildPersistedWorkspaceTreeNodes(persistedNodes())
-			: options.fallbackWorkspaceTree();
-
-		setWorkspaceTreeNodes(nextTree);
-	};
-
-	const loadPersistedTree = async (projectId: string): Promise<boolean> => {
-		const requestId = latestPersistedTreeRequest + 1;
-		latestPersistedTreeRequest = requestId;
-
-		if (!projectId || !isUuidString(projectId)) {
-			setPersistedNodes([]);
-			return false;
-		}
-
-		try {
-			const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/tree`, {
-				headers: {
-					Accept: "application/json",
-				},
-			});
-			const body = (await response.json()) as WorkspaceTreeResponse;
-
-			if (requestId !== latestPersistedTreeRequest) {
-				return false;
-			}
-
-			if (!response.ok) {
-				throw new Error(body.message || "Failed to load project tree.");
-			}
-
-			setPersistedNodes(readPersistedWorkspaceTreeNodes(body));
-			return true;
-		} catch (error) {
-			if (requestId !== latestPersistedTreeRequest) {
-				return false;
-			}
-
-			console.error(error);
-			setPersistedNodes([]);
-			return false;
-		}
-	};
-
-	const resolveFolderPath = (folderId: string): string | null => {
-		const node = findNodeById(workspaceTreeNodes(), folderId);
-		return node?.kind === "folder" ? node.path ?? null : null;
-	};
-
-	const resolveItemPath = (itemId: string): string | null => {
-		const node = findNodeById(workspaceTreeNodes(), itemId);
-		return node?.kind === "item" ? node.path ?? null : null;
-	};
-
-	const refreshAfterMutation = async (projectId: string, response: Response): Promise<boolean> => {
-		const body = (await response.json()) as WorkspaceMutationResponse;
-		if (!response.ok) {
-			throw new Error(body.message || "Failed to persist project tree mutation.");
-		}
-
-		return loadPersistedTree(projectId);
-	};
-
-	const createFolder = async (name: string, parentId: string | null): Promise<boolean> => {
-		const projectId = options.activeProjectId();
-		if (!projectId || !isUuidString(projectId)) {
-			return false;
-		}
-
-		const parentFolderPath = parentId ? resolveFolderPath(parentId) : null;
-		if (parentId && !parentFolderPath) {
-			return false;
-		}
-
-		try {
-			const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/tree/folders`, {
-				method: "POST",
-				headers: {
-					Accept: "application/json",
-					"Content-Type": "application/json",
-				},
-				body: JSON.stringify({
-					name,
-					parentFolderId: parentFolderPath,
-				}),
-			});
-
-			return refreshAfterMutation(projectId, response);
-		} catch (error) {
-			console.error(error);
-			return false;
-		}
-	};
-
-	const renameFolder = async (folderId: string, name: string): Promise<boolean> => {
-		const projectId = options.activeProjectId();
-		const folderPath = resolveFolderPath(folderId);
-		if (!projectId || !isUuidString(projectId) || !folderPath) {
-			return false;
-		}
-
-		try {
-			const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/tree/folders`, {
-				method: "PATCH",
-				headers: {
-					Accept: "application/json",
-					"Content-Type": "application/json",
-				},
-				body: JSON.stringify({
-					folderId: folderPath,
-					name,
-				}),
-			});
-
-			return refreshAfterMutation(projectId, response);
-		} catch (error) {
-			console.error(error);
-			return false;
-		}
-	};
-
-	const deleteFolder = async (folderId: string): Promise<boolean> => {
-		const projectId = options.activeProjectId();
-		const folderPath = resolveFolderPath(folderId);
-		if (!projectId || !isUuidString(projectId) || !folderPath) {
-			return false;
-		}
-
-		try {
-			const response = await fetch(
-				`${resolveAPIBase()}/projects/${projectId}/tree/folders?folderId=${encodeURIComponent(folderPath)}`,
-				{
-					method: "DELETE",
-					headers: {
-						Accept: "application/json",
-					},
-				},
-			);
-
-			return refreshAfterMutation(projectId, response);
-		} catch (error) {
-			console.error(error);
-			return false;
-		}
-	};
-
-	const moveFolder = async (folderId: string, parentId: string | null, targetIndex: number): Promise<boolean> => {
-		const projectId = options.activeProjectId();
-		const folderPath = resolveFolderPath(folderId);
-		const parentFolderPath = parentId ? resolveFolderPath(parentId) : null;
-		if (!projectId || !isUuidString(projectId) || !folderPath) {
-			return false;
-		}
-
-		try {
-			const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/tree/folders/move`, {
-				method: "PATCH",
-				headers: {
-					Accept: "application/json",
-					"Content-Type": "application/json",
-				},
-				body: JSON.stringify({
-					folderId: folderPath,
-					folderNodeId: folderId,
-					parentFolderId: parentFolderPath,
-					parentNodeId: parentId,
-					targetIndex,
-				}),
-			});
-
-			return refreshAfterMutation(projectId, response);
-		} catch (error) {
-			console.error(error);
-			return false;
-		}
-	};
-
-	const createItem = async (
-		name: string,
-		itemType: WorkspaceItemTypeId,
-		parentId: string | null,
-	): Promise<boolean> => {
-		const projectId = options.activeProjectId();
-		if (!projectId || !isUuidString(projectId)) {
-			return false;
-		}
-
-		const parentFolderPath = parentId ? resolveFolderPath(parentId) : null;
-		if (parentId && !parentFolderPath) {
-			return false;
-		}
-
-		try {
-			const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/tree/items`, {
-				method: "POST",
-				headers: {
-					Accept: "application/json",
-					"Content-Type": "application/json",
-				},
-				body: JSON.stringify({
-					name,
-					itemType,
-					parentFolderId: parentFolderPath,
-				}),
-			});
-
-			return refreshAfterMutation(projectId, response);
-		} catch (error) {
-			console.error(error);
-			return false;
-		}
-	};
-
-	const deleteItem = async (itemId: string): Promise<boolean> => {
-		const projectId = options.activeProjectId();
-		const itemPath = resolveItemPath(itemId);
-		if (!projectId || !isUuidString(projectId) || !itemPath) {
-			return false;
-		}
-
-		try {
-			const response = await fetch(
-				`${resolveAPIBase()}/projects/${projectId}/tree/items?itemId=${encodeURIComponent(itemPath)}`,
-				{
-					method: "DELETE",
-					headers: {
-						Accept: "application/json",
-					},
-				},
-			);
-
-			return refreshAfterMutation(projectId, response);
-		} catch (error) {
-			console.error(error);
-			return false;
-		}
-	};
-
-	const moveItem = async (itemId: string, parentId: string | null, targetIndex: number): Promise<boolean> => {
-		const projectId = options.activeProjectId();
-		const itemPath = resolveItemPath(itemId);
-		const parentFolderPath = parentId ? resolveFolderPath(parentId) : null;
-		if (!projectId || !isUuidString(projectId) || !itemPath) {
-			return false;
-		}
-
-		try {
-			const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/tree/items/move`, {
-				method: "PATCH",
-				headers: {
-					Accept: "application/json",
-					"Content-Type": "application/json",
-				},
-				body: JSON.stringify({
-					itemId: itemPath,
-					itemNodeId: itemId,
-					parentFolderId: parentFolderPath,
-					parentNodeId: parentId,
-					targetIndex,
-				}),
-			});
-
-			return refreshAfterMutation(projectId, response);
-		} catch (error) {
-			console.error(error);
-			return false;
-		}
-	};
-
-	createEffect(() => {
-		syncWorkspaceTree();
-	});
-
-	createEffect(() => {
-		void loadPersistedTree(options.activeProjectId());
-	});
-
-	return {
-		workspaceTreeNodes,
-		setWorkspaceTreeNodes,
-		resolveFolderPath,
-		resolveItemPath,
-		createFolder,
-		renameFolder,
-		deleteFolder,
-		moveFolder,
-		createItem,
-		deleteItem,
-		moveItem,
-	};
-};

Frontend/src/components/top-bar/DepartmentSelector/DepartmentSelector.tsx

@@ -1,7 +1,7 @@
 import { For, createEffect, createSignal, onCleanup, onMount, type JSX } from "solid-js";
 import { ChevronDown } from "../../../lib/icons";
-import { useAppShellData } from "../data/app-shell.context";
-import { type DepartmentItem } from "../data/shell.data";
+import { useAppShellData } from "../../app-shell/data/app-shell.context";
+import { type DepartmentItem } from "../../app-shell/data/shell.data";
 import styles from "./DepartmentSelector.module.scss";
 
 export const DepartmentSelector = (): JSX.Element => {

Frontend/src/components/top-bar/TopBar/NotificationsButton.tsx

@@ -1,6 +1,6 @@
 import type { JSX } from "solid-js";
 import { Bell } from "../../../lib/icons";
-import { unreadNotificationCount } from "../data/shell.data";
+import { unreadNotificationCount } from "../../app-shell/data/shell.data";
 import styles from "./NotificationsButton.module.scss";
 
 type NotificationsButtonProps = {

Frontend/src/components/top-bar/TopBar/NotificationsMenu.tsx

@@ -1,6 +1,6 @@
 import { For, Show, type JSX } from "solid-js";
 import { Bell, Settings } from "../../../lib/icons";
-import { notificationItems, unreadNotificationCount } from "../data/shell.data";
+import { notificationItems, unreadNotificationCount } from "../../app-shell/data/shell.data";
 import styles from "./NotificationsMenu.module.scss";
 
 type NotificationsMenuProps = {

Frontend/src/components/top-bar/TopBar/ProfileMenu.tsx

@@ -1,7 +1,7 @@
 import { For, type JSX } from "solid-js";
 import { User } from "../../../lib/icons";
-import { useAppShellData } from "../data/app-shell.context";
-import { profileMenuSections } from "../data/shell.data";
+import { useAppShellData } from "../../app-shell/data/app-shell.context";
+import { profileMenuSections } from "../../app-shell/data/shell.data";
 import styles from "./ProfileMenu.module.scss";
 
 type ProfileMenuProps = {

Frontend/src/components/top-bar/TopBar/ThemeToggle.tsx

@@ -1,7 +1,7 @@
-// Path: Frontend/src/components/shell/TopBar/ThemeToggle.tsx
+// Path: Frontend/src/components/top-bar/TopBar/ThemeToggle.tsx
 
 import type { JSX } from "solid-js";
-import type { Theme } from "../../../theme/runtime";
+import type { Theme } from "../../../helper/themeRuntime";
 import { Moon, Sun } from "../../../lib/icons";
 import styles from "./ThemeToggle.module.scss";
 

Frontend/src/components/top-bar/TopBar/TopBar.tsx

@@ -1,8 +1,8 @@
-// Path: Frontend/src/components/shell/TopBar/TopBar.tsx
+// Path: Frontend/src/components/top-bar/TopBar/TopBar.tsx
 
 import { For, type JSX } from "solid-js";
-import type { Theme } from "../../../theme/runtime";
-import { topBarActions } from "../data/shell.data";
+import type { Theme } from "../../../helper/themeRuntime";
+import { topBarActions } from "../../app-shell/data/shell.data";
 import { DepartmentSelector } from "../DepartmentSelector/DepartmentSelector";
 import { NotificationsNav } from "./NotificationsNav";
 import { ThemeToggle } from "./ThemeToggle";

Frontend/src/components/top-bar/TopBar/UserNavButton.tsx

@@ -1,4 +1,4 @@
-// Path: Frontend/src/components/shell/TopBar/UserNavButton.tsx
+// Path: Frontend/src/components/top-bar/TopBar/UserNavButton.tsx
 
 import type { JSX } from "solid-js";
 import { User } from "../../../lib/icons";

Frontend/src/components/workspace-home/WorkspaceHome.module.scss

@@ -0,0 +1,25 @@
+/* Path: Frontend/src/components/workspace-home/WorkspaceHome.module.scss */
+
+.viewport {
+  --workspace-content-max-width: var(--content-width-wide);
+
+  min-width: 0;
+  min-height: 0;
+  display: grid;
+  align-content: start;
+  gap: var(--space-4);
+  padding: var(--space-5) var(--space-6);
+}
+
+.title {
+  @include text-display;
+  font-family: var(--font-family-display);
+  max-width: 12ch;
+}
+
+@include respond-down(mobile) {
+  .viewport {
+    gap: var(--space-4);
+    padding: var(--space-4) var(--space-4) calc(var(--space-8) + env(safe-area-inset-bottom, 0px));
+  }
+}

Frontend/src/components/workspace-home/WorkspaceHome.tsx

@@ -0,0 +1,15 @@
+// Path: Frontend/src/components/workspace-home/WorkspaceHome.tsx
+
+import { type JSX } from "solid-js";
+import { useAppShellData } from "../app-shell/data/app-shell.context";
+import styles from "./WorkspaceHome.module.scss";
+
+export const WorkspaceHome = (): JSX.Element => {
+	const appShellData = useAppShellData();
+
+	return (
+		<main class={styles.viewport} data-ui="workspace-home">
+			<h1 class={styles.title}>{appShellData.activeServer().name}</h1>
+		</main>
+	);
+};

Frontend/src/components/workspace-home/WorkspaceHome/WorkspaceHome.tsx

@@ -1,271 +0,0 @@
-// Path: Frontend/src/components/workspace-home/WorkspaceHome/WorkspaceHome.tsx
-
-import { Show, createMemo, type JSX } from "solid-js";
-import { Portal } from "solid-js/web";
-import { ChevronLeft, ChevronRight } from "../../../lib/icons";
-import { useAppShellData } from "../../shell/data/app-shell.context";
-import { bootstrapPersonaDefinitions } from "./WorkspaceHome.data";
-import { useWorkspaceHomeWizard } from "./WorkspaceHome.hook";
-import styles from "./WorkspaceHome.module.scss";
-import { BootstrapAdminStep, BootstrapFinishingState, BootstrapInstanceStep, BootstrapModeStep, BootstrapPersonaStep, BootstrapStructureStep, BootstrapWizardProgress } from "./WorkspaceHome.parts";
-
-type WorkspaceHomeProps = {
-	sidebarCollapsed: boolean;
-	onToggleSidebarCollapse: () => void;
-};
-
-export const WorkspaceHome = (props: WorkspaceHomeProps): JSX.Element => {
-	const appShellData = useAppShellData();
-	const {
-		instanceForm,
-		setInstanceForm,
-		modeForm,
-		setModeForm,
-		adminForm,
-		setAdminForm,
-		structureForm,
-		setStructureForm,
-		selectedPersona,
-		hasChosenPersona,
-		stepState,
-		isBootstrapStateResolved,
-		isWizardOpen,
-		setIsWizardOpen,
-		setIsFinishingBootstrapFlow,
-		fieldTooltip,
-		materializationState,
-		isMaterializationInFlight,
-		hasMaterializationFailed,
-		showBootstrapFinishingState,
-		materializationStatusLabel,
-		materializationMessage,
-		personaDefinition,
-		selectedPersonaIsAvailable,
-		usesCondensedBootstrapFlow,
-		activeWizardSteps,
-		bootstrapNamePlaceholder,
-		bootstrapStepCount,
-		currentStep,
-		currentWizardStepIndex,
-		wizardProgressFillWidth,
-		currentStepState,
-		isFirstStep,
-		canDismissWizard,
-		handleCurrentStepSubmit,
-		applyPersonaSelection,
-		statusLabel,
-		showFieldTooltip,
-		hideFieldTooltip,
-		stepStatusLabel,
-		navigateBack,
-		navigateToVisibleStep,
-	} = useWorkspaceHomeWizard(appShellData);
-	const isBootstrapPersisted = createMemo(() => appShellData.installation()?.isBootstrapped ?? false);
-
-	const sidebarToggleLabel = (): string => (props.sidebarCollapsed ? "Expand left workspace sidebar" : "Collapse left workspace sidebar");
-	const breadcrumb = (): string => `${appShellData.activeServer().name} / ${appShellData.activeProject().name} / Home`;
-
-	return (
-		<>
-			<main class={styles.viewport} data-ui="workspace-home">
-				<div class={styles.workspaceTopBar} data-slot="workspace-home-top-bar">
-					<div class={styles.workspaceTopBarStart} data-slot="workspace-home-top-bar-start">
-						<button type="button" class={styles.workspaceCollapseButton} aria-label={sidebarToggleLabel()} title={sidebarToggleLabel()} data-slot="workspace-home-sidebar-toggle" onClick={props.onToggleSidebarCollapse}>
-							{props.sidebarCollapsed ? <ChevronRight size={16} strokeWidth={2} /> : <ChevronLeft size={16} strokeWidth={2} />}
-						</button>
-					</div>
-
-					<div class={styles.workspaceTopBarCenter} data-slot="workspace-home-top-bar-center">
-						<span class={styles.workspaceBreadcrumb}>{breadcrumb()}</span>
-					</div>
-
-					<div class={styles.workspaceTopBarEnd} data-slot="workspace-home-top-bar-end" aria-hidden="true" />
-				</div>
-
-				<section class={styles.hero} data-slot="workspace-home-hero">
-					<h1 class={styles.title}>{isBootstrapPersisted() ? appShellData.activeServer().name : "Server"}</h1>
-					<Show when={isBootstrapStateResolved() && !isBootstrapPersisted()}>
-						<div class={styles.heroActions}>
-							<button
-								type="button"
-								class={styles.primaryButton}
-								onClick={(): void => {
-									setIsWizardOpen(true);
-								}}
-							>
-								Open bootstrap wizard
-							</button>
-						</div>
-					</Show>
-				</section>
-			</main>
-
-			<Show when={isBootstrapStateResolved() && isWizardOpen()}>
-				<Portal>
-					<div class={styles.wizardLayer} data-ui="bootstrap-wizard" data-step={currentStep().id}>
-						<div class={styles.wizardBackdrop} aria-hidden="true" />
-
-						<section class={styles.wizardPanel} role="dialog" aria-modal="true" aria-labelledby="bootstrap-wizard-title" data-slot="bootstrap-wizard-panel">
-							<header class={styles.wizardHeader} data-slot="bootstrap-wizard-header">
-								<div class={styles.wizardHeaderCopy}>
-									<h2 id="bootstrap-wizard-title" class={styles.wizardTitle}>
-										Bootstrap Server
-									</h2>
-								</div>
-								<Show when={canDismissWizard()}>
-									<button
-										type="button"
-										class={styles.wizardCloseButton}
-										onClick={(): void => {
-											setIsWizardOpen(false);
-										}}
-									>
-										Close
-									</button>
-								</Show>
-							</header>
-
-							<Show
-								when={!showBootstrapFinishingState()}
-								fallback={
-									<BootstrapFinishingState
-										materializationState={materializationState()}
-										statusLabel={materializationStatusLabel()}
-										message={materializationMessage()}
-										isInFlight={isMaterializationInFlight()}
-										hasFailed={hasMaterializationFailed()}
-										onClose={(): void => {
-											setIsFinishingBootstrapFlow(false);
-											setIsWizardOpen(false);
-										}}
-									/>
-								}
-							>
-								<div class={styles.wizardBody}>
-									<Show when={currentStep().id !== "persona"}>
-										<BootstrapWizardProgress
-											steps={activeWizardSteps()}
-											currentStepId={currentStep().id}
-											currentWizardStepIndex={currentWizardStepIndex()}
-											stepState={stepState}
-											bootstrapStepCount={bootstrapStepCount()}
-											wizardProgressFillWidth={wizardProgressFillWidth()}
-											stepStatusLabel={stepStatusLabel}
-											onSelectStep={navigateToVisibleStep}
-										/>
-									</Show>
-
-									<div class={styles.wizardStepPanel} data-slot="bootstrap-wizard-step-panel">
-										<Show when={currentStep().id !== "persona" || statusLabel(currentStepState())}>
-											<div class={styles.sectionHeader}>
-												<Show when={currentStep().id !== "persona"}>
-													<div>
-														<span class={styles.wizardStepEyebrow}>{`Step ${currentWizardStepIndex() + 1} of ${bootstrapStepCount()}`}</span>
-													</div>
-												</Show>
-												<Show when={statusLabel(currentStepState())}>
-													<div class={styles.statusBadge} data-status={currentStepState().status}>
-														{statusLabel(currentStepState())}
-													</div>
-												</Show>
-											</div>
-										</Show>
-
-										<form class={styles.form} onSubmit={handleCurrentStepSubmit}>
-											<Show when={currentStep().id === "persona"}>
-												<BootstrapPersonaStep
-													personas={bootstrapPersonaDefinitions}
-													hasChosenPersona={hasChosenPersona()}
-													selectedPersona={selectedPersona()}
-													selectedPersonaIsAvailable={selectedPersonaIsAvailable()}
-													onSelectPersona={applyPersonaSelection}
-												/>
-											</Show>
-
-											<Show when={currentStep().id === "instance"}>
-												<BootstrapInstanceStep
-													instanceForm={instanceForm}
-													onProtocolChange={(value): void => setInstanceForm("protocol", value)}
-													onAccessChange={(value): void => setInstanceForm("access", value)}
-													onHostChange={(value): void => setInstanceForm("host", value)}
-													onShowTooltip={showFieldTooltip}
-													onHideTooltip={hideFieldTooltip}
-												/>
-											</Show>
-
-											<Show when={currentStep().id === "mode"}>
-												<BootstrapModeStep
-													modeForm={modeForm}
-													structureForm={structureForm}
-													usesCondensedBootstrapFlow={usesCondensedBootstrapFlow()}
-													selectedPersona={selectedPersona()}
-													namePlaceholder={bootstrapNamePlaceholder()}
-													onNameChange={(value): void => setModeForm("name", value)}
-													onProjectNameChange={(value): void => setStructureForm("projectName", value)}
-													onTeamNameChange={(value): void => setStructureForm("teamName", value)}
-													onShowTooltip={showFieldTooltip}
-													onHideTooltip={hideFieldTooltip}
-												/>
-											</Show>
-
-											<Show when={currentStep().id === "admin"}>
-												<BootstrapAdminStep
-													adminForm={adminForm}
-													onDisplayNameChange={(value): void => setAdminForm("displayName", value)}
-													onEmailChange={(value): void => setAdminForm("email", value)}
-													onPasswordChange={(value): void => setAdminForm("password", value)}
-												/>
-											</Show>
-
-											<Show when={currentStep().id === "structure"}>
-												<BootstrapStructureStep
-													mode={modeForm.mode}
-													structureForm={structureForm}
-													onDepartmentNameChange={(value): void => setStructureForm("departmentName", value)}
-													onTeamNameChange={(value): void => setStructureForm("teamName", value)}
-													onProjectNameChange={(value): void => setStructureForm("projectName", value)}
-													onShowTooltip={showFieldTooltip}
-													onHideTooltip={hideFieldTooltip}
-												/>
-											</Show>
-
-											<Show when={currentStep().id !== "persona"}>
-												<div class={styles.wizardFormActions}>
-													<button type="button" class={styles.secondaryButton} disabled={isFirstStep()} onClick={navigateBack}>
-														Back
-													</button>
-													<button type="submit" class={styles.primaryButton} disabled={currentStepState().status === "submitting"}>
-														{currentStep().buttonLabel}
-													</button>
-												</div>
-											</Show>
-										</form>
-
-										<Show when={currentStepState().error}>
-											<p class={styles.errorText}>{currentStepState().error}</p>
-										</Show>
-									</div>
-								</div>
-							</Show>
-						</section>
-
-						<Show when={fieldTooltip()}>
-							{(tooltip): JSX.Element => (
-								<div
-									class={styles.fieldTooltip}
-									data-placement={tooltip().placement}
-									style={{
-										left: `${tooltip().left}px`,
-										top: `${tooltip().top}px`,
-									}}
-								>
-									<div class={styles.fieldTooltipBubble}>{tooltip().text}</div>
-								</div>
-							)}
-						</Show>
-					</div>
-				</Portal>
-			</Show>
-		</>
-	);
-};

Frontend/src/components/workspace-navigation/LeftRail/LeftRail.tsx

@@ -1,8 +1,8 @@
-// Path: Frontend/src/components/shell/LeftRail/LeftRail.tsx
+// Path: Frontend/src/components/workspace-navigation/LeftRail/LeftRail.tsx
 
 import { For, Show, type JSX } from "solid-js";
-import { useAppShellData } from "../data/app-shell.context";
-import { type RailItem } from "../data/shell.data";
+import { useAppShellData } from "../../app-shell/data/app-shell.context";
+import { type RailItem } from "../../app-shell/data/shell.data";
 import styles from "./LeftRail.module.scss";
 
 type RailEntryProps = {

Frontend/src/components/workspace-navigation/MobileWorkspaceBrowser/MobileWorkspaceBrowser.data.ts

@@ -0,0 +1,91 @@
+// Path: Frontend/src/components/workspace-navigation/MobileWorkspaceBrowser/MobileWorkspaceBrowser.data.ts
+
+import type { WorkspaceTreeNode } from "../../app-shell/data/shell.data";
+
+export type MobileWorkspaceBrowserProps = {
+	open: boolean;
+	onClose: VoidFunction;
+};
+
+export type MobileWorkspaceDialogState =
+	| {
+			kind: "text";
+			title: string;
+			message: string;
+			confirmLabel: string;
+			initialValue: string;
+			onConfirm: (value: string) => void;
+	  }
+	| {
+			kind: "confirm";
+			title: string;
+			message: string;
+			confirmLabel: string;
+			tone?: "danger";
+			onConfirm: () => void;
+	  };
+
+export type MobileMoveTargetState = {
+	kind: "folder" | "item";
+	id: string;
+	label: string;
+};
+
+export type MobileMoveDestination = {
+	id: string | null;
+	label: string;
+	depth: number;
+	meta?: string;
+};
+
+export const collectMoveDestinations = (
+	nodes: readonly WorkspaceTreeNode[],
+	movingTarget: MobileMoveTargetState,
+	depth = 0,
+	ancestorBlocked = false,
+): MobileMoveDestination[] => {
+	const destinations: MobileMoveDestination[] = [];
+
+	for (const node of nodes) {
+		if (node.kind !== "folder") {
+			continue;
+		}
+
+		const isBlockedFolder = movingTarget.kind === "folder" && node.id === movingTarget.id;
+		if (!ancestorBlocked && !isBlockedFolder) {
+			destinations.push({
+				id: node.id,
+				label: node.label,
+				depth,
+				meta: "Folder",
+			});
+		}
+
+		destinations.push(
+			...collectMoveDestinations(node.children ?? [], movingTarget, depth + 1, ancestorBlocked || isBlockedFolder),
+		);
+	}
+
+	return destinations;
+};
+
+export const findTreeNodeById = (nodes: readonly WorkspaceTreeNode[], nodeId: string): WorkspaceTreeNode | null => {
+	for (const node of nodes) {
+		if (node.id === nodeId) {
+			return node;
+		}
+
+		if (node.kind !== "folder") {
+			continue;
+		}
+
+		const nestedMatch = findTreeNodeById(node.children ?? [], nodeId);
+		if (nestedMatch) {
+			return nestedMatch;
+		}
+	}
+
+	return null;
+};
+
+export const isDangerDialogState = (state: MobileWorkspaceDialogState): boolean => state.kind === "confirm" && state.tone === "danger";

Frontend/src/components/workspace-navigation/MobileWorkspaceBrowser/MobileWorkspaceBrowser.hook.ts

@@ -0,0 +1,273 @@
+// Path: Frontend/src/components/workspace-navigation/MobileWorkspaceBrowser/MobileWorkspaceBrowser.hook.ts
+
+import { createSignal } from "solid-js";
+import { createLongPressGesture } from "../../../helper/createLongPressGesture";
+import { useAppShellData } from "../../app-shell/data/app-shell.context";
+import {
+	createWorkspaceSurfaceTarget,
+	getWorkspaceItemTypeDefinition,
+	type WorkspaceContextMenuAction,
+	type WorkspaceContextMenuTarget,
+	type WorkspaceItemTypeId,
+} from "../../app-shell/data/shell.data";
+import { useWorkspaceTreeData } from "../shared/useWorkspaceTreeData";
+import {
+	collectMoveDestinations,
+	findTreeNodeById,
+	type MobileMoveDestination,
+	type MobileMoveTargetState,
+	type MobileWorkspaceDialogState,
+} from "./MobileWorkspaceBrowser.data";
+
+export const useMobileWorkspaceBrowser = () => {
+	const appShellData = useAppShellData();
+	const [actionSheetTarget, setActionSheetTarget] = createSignal<WorkspaceContextMenuTarget | null>(null);
+	const [dialogState, setDialogState] = createSignal<MobileWorkspaceDialogState | null>(null);
+	const [dialogValue, setDialogValue] = createSignal("");
+	const [moveTarget, setMoveTarget] = createSignal<MobileMoveTargetState | null>(null);
+	const { workspaceTreeNodes, createFolder, renameFolder, deleteFolder, moveFolder, createItem, deleteItem, moveItem } = useWorkspaceTreeData({
+		activeProjectId: () => appShellData.activeProject().id,
+		fallbackWorkspaceTree: () => appShellData.workspaceTree(),
+	});
+	const workspaceTarget = () => createWorkspaceSurfaceTarget(appShellData.activeProject());
+
+	const moveDestinations = (): MobileMoveDestination[] => {
+		const target = moveTarget();
+		if (!target) {
+			return [];
+		}
+
+		return [{ id: null, label: "Items root", depth: 0, meta: "Root" }, ...collectMoveDestinations(workspaceTreeNodes(), target)];
+	};
+
+	const resolveCreateItemType = (actionId: string): WorkspaceItemTypeId | null => {
+		switch (actionId) {
+			case "create-doc":
+				return "core.doc";
+			case "create-board":
+				return "core.board.kanban";
+			case "create-list-board":
+				return "core.board.list";
+			default:
+				return null;
+		}
+	};
+
+	const createPersistedItem = (itemType: WorkspaceItemTypeId, parentId: string | null): void => {
+		const definition = getWorkspaceItemTypeDefinition(itemType);
+		void createItem(definition.defaultCreateLabel, itemType, parentId);
+	};
+
+	const openActionSheet = (target: WorkspaceContextMenuTarget): void => {
+		setActionSheetTarget(target);
+	};
+
+	const closeActionSheet = (): void => {
+		setActionSheetTarget(null);
+	};
+
+	const closeMoveSheet = (): void => {
+		setMoveTarget(null);
+	};
+
+	const openWorkspaceActionSheet = (): void => {
+		openActionSheet(workspaceTarget());
+	};
+
+	const closeDialog = (): void => {
+		setDialogState(null);
+		setDialogValue("");
+	};
+
+	const openMoveSheet = (target: MobileMoveTargetState): void => {
+		setMoveTarget(target);
+	};
+
+	const openTextDialog = (config: Omit<Extract<MobileWorkspaceDialogState, { kind: "text" }>, "kind">): void => {
+		setDialogValue(config.initialValue);
+		setDialogState({ kind: "text", ...config });
+	};
+
+	const openConfirmDialog = (config: Omit<Extract<MobileWorkspaceDialogState, { kind: "confirm" }>, "kind">): void => {
+		setDialogValue("");
+		setDialogState({ kind: "confirm", ...config });
+	};
+
+	const submitDialog = (): void => {
+		const state = dialogState();
+		if (!state) {
+			return;
+		}
+
+		if (state.kind === "text") {
+			const value = dialogValue().trim();
+			if (!value) {
+				return;
+			}
+
+			closeDialog();
+			state.onConfirm(value);
+			return;
+		}
+
+		closeDialog();
+		state.onConfirm();
+	};
+
+	const handleMoveDestinationSelect = (destinationId: string | null): void => {
+		const target = moveTarget();
+		if (!target) {
+			return;
+		}
+
+		const destinationNode = destinationId ? findTreeNodeById(workspaceTreeNodes(), destinationId) : null;
+		const targetIndex = destinationNode?.kind === "folder"
+			? destinationNode.children?.length ?? 0
+			: destinationId
+				? 0
+				: workspaceTreeNodes().length;
+
+		closeMoveSheet();
+
+		if (target.kind === "folder") {
+			void moveFolder(target.id, destinationId, targetIndex);
+			return;
+		}
+
+		void moveItem(target.id, destinationId, targetIndex);
+	};
+
+	const handleActionSelect = (action: WorkspaceContextMenuAction, target: WorkspaceContextMenuTarget): void => {
+		const createItemType = resolveCreateItemType(action.id);
+		if (createItemType) {
+			switch (target.kind) {
+				case "workspace":
+				case "home":
+					createPersistedItem(createItemType, null);
+					return;
+				case "folder":
+					createPersistedItem(createItemType, target.id);
+					return;
+				case "settings":
+				case "item":
+					return;
+			}
+		}
+
+		switch (action.id) {
+			case "new-folder": {
+				if (target.kind === "settings" || target.kind === "item") {
+					return;
+				}
+
+				openTextDialog({
+					title: "New folder",
+					message: target.kind === "folder" ? `Create a folder inside "${target.label}".` : "Create a folder at the root of Items.",
+					confirmLabel: "Create",
+					initialValue: "Untitled folder",
+					onConfirm: (name) => {
+						void createFolder(name, target.kind === "folder" ? target.id : null);
+					},
+				});
+				return;
+			}
+			case "rename-folder": {
+				if (target.kind !== "folder") {
+					return;
+				}
+
+				openTextDialog({
+					title: "Rename folder",
+					message: `Update the name for "${target.label}".`,
+					confirmLabel: "Save",
+					initialValue: target.label,
+					onConfirm: (name) => {
+						if (name === target.label) {
+							return;
+						}
+						void renameFolder(target.id, name);
+					},
+				});
+				return;
+			}
+			case "move-folder": {
+				if (target.kind !== "folder") {
+					return;
+				}
+
+				openMoveSheet({ kind: "folder", id: target.id, label: target.label });
+				return;
+			}
+			case "delete-folder": {
+				if (target.kind !== "folder") {
+					return;
+				}
+
+				openConfirmDialog({
+					title: "Delete folder?",
+					message: `"${target.label}" and everything inside it will be removed.`,
+					confirmLabel: "Delete",
+					tone: "danger",
+					onConfirm: () => {
+						void deleteFolder(target.id);
+					},
+				});
+				return;
+			}
+			case "move-doc":
+			case "move-board":
+			case "move-list-board": {
+				if (target.kind !== "item") {
+					return;
+				}
+
+				openMoveSheet({ kind: "item", id: target.id, label: target.label });
+				return;
+			}
+			case "delete-doc":
+			case "delete-board":
+			case "delete-list-board": {
+				if (target.kind !== "item") {
+					return;
+				}
+
+				openConfirmDialog({
+					title: "Delete item?",
+					message: `"${target.label}" will be removed from the project tree.`,
+					confirmLabel: "Delete",
+					tone: "danger",
+					onConfirm: () => {
+						void deleteItem(target.id);
+					},
+				});
+				return;
+			}
+			default:
+				return;
+		}
+	};
+
+	const workspaceLongPress = createLongPressGesture({
+		onLongPress: openWorkspaceActionSheet,
+	});
+
+	return {
+		appShellData,
+		actionSheetTarget,
+		openActionSheet,
+		closeActionSheet,
+		dialogState,
+		dialogValue,
+		setDialogValue,
+		closeDialog,
+		submitDialog,
+		moveTarget,
+		moveDestinations,
+		closeMoveSheet,
+		handleMoveDestinationSelect,
+		workspaceTreeNodes,
+		handleActionSelect,
+		workspaceLongPress,
+		openWorkspaceActionSheet,
+	};
+};

Frontend/src/components/workspace-navigation/MobileWorkspaceBrowser/MobileWorkspaceBrowser.parts.tsx

@@ -0,0 +1,140 @@
+// Path: Frontend/src/components/workspace-navigation/MobileWorkspaceBrowser/MobileWorkspaceBrowser.parts.tsx
+
+import { For, Show, type JSX } from "solid-js";
+import { ChevronRight } from "../../../lib/icons";
+import { createLongPressGesture } from "../../../helper/createLongPressGesture";
+import {
+	createWorkspaceStaticTarget,
+	createWorkspaceTreeTarget,
+	getWorkspaceNodeIcon,
+	type SidebarItem,
+	type WorkspaceContextMenuTarget,
+	type WorkspaceStaticItem,
+	type WorkspaceTreeNode,
+} from "../../app-shell/data/shell.data";
+import styles from "./MobileWorkspaceBrowser.module.scss";
+
+export const TreeRow = (props: { node: WorkspaceTreeNode; depth?: number }): JSX.Element => {
+	const depth = props.depth ?? 0;
+	const Icon = getWorkspaceNodeIcon(props.node);
+	const hasChildren = (props.node.children?.length ?? 0) > 0;
+
+	return (
+		<button
+			classList={{
+				[styles.treeRow]: true,
+				[styles.treeRowActive]: props.node.active ?? false,
+				[styles.treeRowBranch]: hasChildren,
+			}}
+			type="button"
+			style={{ "--tree-depth": `${depth}` }}
+			data-slot="mobile-workspace-tree-row"
+			data-kind={props.node.kind}
+			data-item-type={props.node.kind === "item" ? props.node.itemType : undefined}
+			data-active={props.node.active ? "true" : "false"}
+		>
+			<span class={styles.treeRowLead}>
+				<Icon size={16} strokeWidth={2} />
+				<span class={styles.treeLabel}>{props.node.label}</span>
+			</span>
+
+			<span class={styles.treeRowTrail}>
+				<Show when={props.node.meta}>
+					<span class={styles.treeMeta}>{props.node.meta}</span>
+				</Show>
+				<Show when={hasChildren}>
+					<ChevronRight size={14} strokeWidth={2} class={styles.treeChevron} />
+				</Show>
+			</span>
+		</button>
+	);
+};
+
+export const StaticRow = (props: { item: SidebarItem }): JSX.Element => {
+	const Icon = props.item.icon;
+
+	return (
+		<button classList={{ [styles.treeRow]: true, [styles.treeRowActive]: props.item.active ?? false }} type="button" style={{ "--tree-depth": "0" }} data-slot="mobile-workspace-static-row" data-active={props.item.active ? "true" : "false"}>
+			<span class={styles.treeRowLead}>
+				<Icon size={16} strokeWidth={2} />
+				<span class={styles.treeLabel}>{props.item.label}</span>
+			</span>
+			<span class={styles.treeRowTrail}>
+				<Show when={props.item.meta}>
+					<span class={styles.treeMeta}>{props.item.meta}</span>
+				</Show>
+				<ChevronRight size={14} strokeWidth={2} class={styles.treeChevron} />
+			</span>
+		</button>
+	);
+};
+
+export const WorkspaceStaticRow = (props: {
+	item: WorkspaceStaticItem;
+	onOpenActionSheet: (target: WorkspaceContextMenuTarget) => void;
+}): JSX.Element => {
+	const target = createWorkspaceStaticTarget(props.item);
+	const longPress = createLongPressGesture({
+		onLongPress: () => {
+			props.onOpenActionSheet(target);
+		},
+	});
+
+	return (
+		<li
+			class={styles.treeListItem}
+			data-slot="mobile-workspace-static-item"
+			data-target-kind={target.kind}
+			onContextMenu={(event): void => {
+				event.preventDefault();
+				props.onOpenActionSheet(target);
+			}}
+			{...longPress}
+		>
+			<StaticRow item={props.item} />
+		</li>
+	);
+};
+
+export const WorkspaceTreeBranch = (props: {
+	nodes: readonly WorkspaceTreeNode[];
+	depth?: number;
+	onOpenActionSheet: (target: WorkspaceContextMenuTarget) => void;
+}): JSX.Element => {
+	const depth = props.depth ?? 0;
+
+	return (
+		<For each={props.nodes}>
+			{(node): JSX.Element => {
+				const target = createWorkspaceTreeTarget(node);
+				const longPress = createLongPressGesture({
+					onLongPress: () => {
+						props.onOpenActionSheet(target);
+					},
+				});
+
+				return (
+					<li
+						class={styles.treeListItem}
+						data-slot="mobile-workspace-tree-item"
+						data-kind={node.kind}
+						data-item-type={node.kind === "item" ? node.itemType : undefined}
+						onContextMenu={(event): void => {
+							event.preventDefault();
+							props.onOpenActionSheet(target);
+						}}
+						{...longPress}
+					>
+						<TreeRow node={node} depth={depth} />
+
+						<Show when={node.children?.length}>
+							<ul class={styles.treeListNested}>
+								<WorkspaceTreeBranch nodes={node.children ?? []} depth={depth + 1} onOpenActionSheet={props.onOpenActionSheet} />
+							</ul>
+						</Show>
+					</li>
+				);
+			}}
+		</For>
+	);
+};

Frontend/src/components/workspace-navigation/MobileWorkspaceBrowser/MobileWorkspaceBrowser.tsx

@@ -0,0 +1,192 @@
+import { For, Show, type JSX } from "solid-js";
+import { Portal } from "solid-js/web";
+import { Plus, X } from "../../../lib/icons";
+import {
+	workspaceStaticItems,
+} from "../../app-shell/data/shell.data";
+import { WorkspaceMobileActionSheet } from "../WorkspaceMobileActionSheet/WorkspaceMobileActionSheet";
+import { useMobileWorkspaceBrowser } from "./MobileWorkspaceBrowser.hook";
+import { isDangerDialogState, type MobileWorkspaceBrowserProps } from "./MobileWorkspaceBrowser.data";
+import { WorkspaceStaticRow, WorkspaceTreeBranch } from "./MobileWorkspaceBrowser.parts";
+import styles from "./MobileWorkspaceBrowser.module.scss";
+
+export const MobileWorkspaceBrowser = (props: MobileWorkspaceBrowserProps): JSX.Element => {
+	const {
+		appShellData,
+		actionSheetTarget,
+		openActionSheet,
+		closeActionSheet,
+		dialogState,
+		dialogValue,
+		setDialogValue,
+		closeDialog,
+		submitDialog,
+		moveTarget,
+		moveDestinations,
+		closeMoveSheet,
+		handleMoveDestinationSelect,
+		workspaceTreeNodes,
+		handleActionSelect,
+		workspaceLongPress,
+		openWorkspaceActionSheet,
+	} = useMobileWorkspaceBrowser();
+
+	return (
+		<Show when={props.open}>
+			<div class={styles.browserLayer} data-ui="mobile-workspace-browser">
+				<section class={styles.sheet} aria-label="Mobile workspace browser" data-slot="mobile-workspace-sheet">
+					<header class={styles.sheetHeader} data-slot="mobile-workspace-header">
+						<div
+							class={styles.brandBlock}
+							data-slot="mobile-workspace-brand"
+							onContextMenu={(event): void => {
+								event.preventDefault();
+								openWorkspaceActionSheet();
+							}}
+							{...workspaceLongPress}
+						>
+							{/* Long-pressing the browser header exposes workspace-level actions on mobile. */}
+							<span class={styles.brandEyebrow}>Moku Work</span>
+							<strong class={styles.brandTitle}>{appShellData.activeProject().name}</strong>
+							<span class={styles.brandContext}>{appShellData.activeServer().name}</span>
+						</div>
+
+						<div class={styles.headerActions} data-slot="mobile-workspace-header-actions">
+							<button
+								class={styles.createButton}
+								type="button"
+								aria-label="Create"
+								data-slot="mobile-workspace-create"
+								onClick={openWorkspaceActionSheet}
+							>
+								<Plus size={16} strokeWidth={2.25} />
+								<span>Create</span>
+							</button>
+
+							<button class={styles.closeButton} type="button" aria-label="Close workspace browser" data-slot="mobile-workspace-close" onClick={props.onClose}>
+								<X size={18} strokeWidth={2} />
+							</button>
+						</div>
+					</header>
+
+					<div class={styles.sheetBody} data-slot="mobile-workspace-body">
+						<section class={styles.sectionBlock} data-slot="mobile-workspace-section" data-section-id="workspace">
+							<span class={styles.sectionLabel}>Workspace</span>
+							<ul class={styles.treeList} data-slot="mobile-workspace-list" data-section-id="workspace">
+								<For each={workspaceStaticItems}>
+									{(item): JSX.Element => <WorkspaceStaticRow item={item} onOpenActionSheet={openActionSheet} />}
+								</For>
+							</ul>
+						</section>
+
+						<section class={styles.sectionBlock} data-slot="mobile-workspace-section" data-section-id="items">
+							<span class={styles.sectionLabel}>Items</span>
+							<ul class={styles.treeList} data-slot="mobile-workspace-list" data-section-id="items">
+								<WorkspaceTreeBranch nodes={workspaceTreeNodes()} onOpenActionSheet={openActionSheet} />
+							</ul>
+						</section>
+					</div>
+				</section>
+
+				<WorkspaceMobileActionSheet target={actionSheetTarget()} onClose={closeActionSheet} onSelect={handleActionSelect} />
+
+				<Show when={moveTarget()}>
+					{(state): JSX.Element => (
+						<Portal>
+							<div class={styles.moveSheetLayer} data-ui="mobile-workspace-move-sheet">
+								<button class={styles.dialogBackdrop} type="button" aria-label="Close move sheet" onClick={closeMoveSheet} />
+								<section class={styles.moveSheet} aria-label={`Move ${state().label}`}>
+									<div class={styles.moveSheetHandle} aria-hidden="true" />
+									<div class={styles.moveSheetHeader}>
+										<div class={styles.moveSheetHeaderCopy}>
+											<span class={styles.moveSheetEyebrow}>Move {state().kind}</span>
+											<strong class={styles.moveSheetTitle}>{state().label}</strong>
+											<p class={styles.moveSheetMessage}>Choose a new location in the project tree.</p>
+										</div>
+									</div>
+
+									<div class={styles.moveSection}>
+										<span class={styles.moveSectionLabel}>Destination</span>
+										<div class={styles.moveDestinationList}>
+											<For each={moveDestinations()}>
+												{(destination): JSX.Element => (
+													<button
+														type="button"
+														class={styles.moveDestinationButton}
+														style={{ "--move-depth": `${destination.depth}` }}
+														onClick={(): void => handleMoveDestinationSelect(destination.id)}
+													>
+														<span class={styles.moveDestinationLabel}>{destination.label}</span>
+														<Show when={destination.meta}>
+															<span class={styles.moveDestinationMeta}>{destination.meta}</span>
+														</Show>
+													</button>
+												)}
+											</For>
+										</div>
+									</div>
+
+									<div class={styles.moveSheetFooter}>
+										<button class={styles.dialogSecondaryButton} type="button" onClick={closeMoveSheet}>
+											Cancel
+										</button>
+									</div>
+								</section>
+							</div>
+						</Portal>
+					)}
+				</Show>
+
+				<Show when={dialogState()}>
+					{(state): JSX.Element => (
+						<Portal>
+							<div class={styles.dialogLayer} data-ui="mobile-workspace-dialog">
+								<button class={styles.dialogBackdrop} type="button" aria-label="Close dialog" onClick={closeDialog} />
+								<section class={styles.dialogCard} aria-label={state().title}>
+									<div class={styles.dialogCopy}>
+										<strong class={styles.dialogTitle}>{state().title}</strong>
+										<p class={styles.dialogMessage}>{state().message}</p>
+									</div>
+
+									<Show when={state().kind === "text"}>
+										<input
+											class={styles.dialogInput}
+											type="text"
+											value={dialogValue()}
+											onInput={(event): void => {
+												setDialogValue(event.currentTarget.value);
+											}}
+											onKeyDown={(event): void => {
+												if (event.key === "Enter") {
+													event.preventDefault();
+													submitDialog();
+												}
+											}}
+											autofocus
+										/>
+									</Show>
+
+									<div class={styles.dialogActions}>
+										<button class={styles.dialogSecondaryButton} type="button" onClick={closeDialog}>
+											Cancel
+										</button>
+										<button
+											classList={{
+												[styles.dialogPrimaryButton]: true,
+												[styles.dialogDangerButton]: isDangerDialogState(state()),
+											}}
+											type="button"
+											onClick={submitDialog}
+										>
+											{state().confirmLabel}
+										</button>
+									</div>
+								</section>
+							</div>
+						</Portal>
+					)}
+				</Show>
+			</div>
+		</Show>
+	);
+};

Frontend/src/components/workspace-navigation/ProjectContextMenu/ProjectContextMenu.tsx

@@ -7,7 +7,7 @@ import {
 	type ProjectContextMenuAction,
 	type ProjectMenuTarget,
 	type WorkspaceContextMenuShortcut,
-} from "../data/shell.data";
+} from "../../app-shell/data/shell.data";
 import styles from "../WorkspaceContextMenu/WorkspaceContextMenu.module.scss";
 
 type ShortcutPlatform = "mac" | "windows";

Frontend/src/components/workspace-navigation/ProjectContextMenu/createProjectContextMenuController.ts

@@ -1,5 +1,5 @@
 import { createEffect, createSignal, onCleanup } from "solid-js";
-import type { ProjectMenuTarget } from "../data/shell.data";
+import type { ProjectMenuTarget } from "../../app-shell/data/shell.data";
 
 type ProjectContextMenuState = {
 	target: ProjectMenuTarget;

Frontend/src/components/workspace-navigation/ProjectSelector/ProjectSelector.data.ts

@@ -0,0 +1,144 @@
+// Path: Frontend/src/components/workspace-navigation/ProjectSelector/ProjectSelector.data.ts
+
+import type { JSX } from "solid-js";
+import type {
+	NavTreeAdapter,
+	NavTreeDropTarget,
+} from "../shared/navTreeDnd";
+import type { ProjectItem } from "../../app-shell/data/shell.data";
+
+export type ProjectSelectorProps = {
+	compact?: boolean;
+	isOpen: boolean;
+	onToggle: () => void;
+	onClose: () => void;
+};
+
+export type ProjectFolderNode = {
+	kind: "folder";
+	id: string;
+	path: string;
+	label: string;
+	meta?: string;
+	children: ProjectTreeNode[];
+};
+
+export type ProjectLeafNode = {
+	kind: "project";
+	item: ProjectItem;
+};
+
+export type ProjectTreeNode = ProjectFolderNode | ProjectLeafNode;
+
+export type PersistedProjectFolderRecord = {
+	id: string;
+	path: string;
+	label: string;
+	children: PersistedProjectFolderRecord[];
+};
+
+export type ProjectFoldersResponse = {
+	data?: {
+		folders?: PersistedProjectFolderRecord[];
+		renamedFolder?: PersistedProjectFolderRecord;
+		movedFolder?: PersistedProjectFolderRecord;
+		previousFolderId?: string;
+		previousFolderPath?: string;
+	};
+	error?: string;
+	message?: string;
+};
+
+export type PendingProjectFolderDraft = {
+	parentId: string | null;
+	depth: number;
+};
+
+export type PendingProjectFolderRename = {
+	folderId: string;
+	depth: number;
+};
+
+export type ProjectDragTarget = NavTreeDropTarget;
+
+export type ProjectDragState = {
+	draggedNodeId: string;
+	dropTarget: ProjectDragTarget | null;
+};
+
+export type DragGhostPosition = {
+	x: number;
+	y: number;
+};
+
+export type ProjectFolderBranchProps = {
+	nodes: readonly ProjectTreeNode[];
+	depth: number;
+	parentId: string | null;
+	selectedProjectId: string;
+	isFolderCollapsed: (folderId: string) => boolean;
+	onToggleFolder: (folderId: string) => void;
+	onSelectProject: (projectId: string) => void;
+	onOpenFolderMenu: (event: MouseEvent, folder: ProjectFolderNode) => void;
+	onOpenProjectMenu: (event: MouseEvent, item: ProjectItem) => void;
+	onNodePointerDown: (event: PointerEvent, nodeId: string) => void;
+	onNodePointerMove: (event: PointerEvent, parentId: string | null, index: number, node: ProjectTreeNode) => void;
+	pendingFolderDraft: PendingProjectFolderDraft | null;
+	pendingFolderName: string;
+	onPendingFolderNameChange: (value: string) => void;
+	onSubmitPendingFolder: () => void;
+	onCancelPendingFolder: () => void;
+	pendingFolderRename: PendingProjectFolderRename | null;
+	pendingFolderRenameName: string;
+	onPendingFolderRenameChange: (value: string) => void;
+	onSubmitPendingFolderRename: () => void;
+	onCancelPendingFolderRename: () => void;
+	dragState: ProjectDragState | null;
+	isTreeClickSuppressed: () => boolean;
+};
+
+export const LONG_PRESS_MS = 320;
+
+export const getProjectTreeNodeId = (node: ProjectTreeNode): string =>
+	node.kind === "folder" ? node.id : node.item.id;
+
+export const buildPersistedFolderNodes = (folders: readonly PersistedProjectFolderRecord[] = []): ProjectTreeNode[] =>
+	folders.map((folder) => ({
+		kind: "folder",
+		id: folder.id,
+		path: folder.path,
+		label: folder.label,
+		children: buildPersistedFolderNodes(folder.children ?? []),
+	}));
+
+export const buildProjectTree = (
+	items: readonly ProjectItem[],
+	folders: readonly PersistedProjectFolderRecord[] = [],
+): ProjectTreeNode[] => [
+	...items.map((item) => ({
+		kind: "project" as const,
+		item,
+	})),
+	...buildPersistedFolderNodes(folders),
+];
+
+export const countProjectFolderSiblingsBeforeIndex = (
+	siblings: readonly ProjectTreeNode[],
+	index: number,
+): number => siblings.slice(0, index).filter((node) => node.kind === "folder").length;
+
+export const readPersistedFolders = (body: ProjectFoldersResponse): PersistedProjectFolderRecord[] =>
+	Array.isArray(body.data?.folders) ? body.data.folders : [];
+
+export const projectTreeAdapter: NavTreeAdapter<ProjectTreeNode> = {
+	getNodeId: getProjectTreeNodeId,
+	isBranchNode: (node) => node.kind === "folder",
+	getChildren: (node) => (node.kind === "folder" ? node.children : []),
+	withChildren: (node, children) =>
+		node.kind === "folder"
+			? {
+				...node,
+				children: [...children],
+			}
+			: node,
+};

Frontend/src/components/workspace-navigation/ProjectSelector/ProjectSelector.hook.ts

@@ -0,0 +1,671 @@
+// Path: Frontend/src/components/workspace-navigation/ProjectSelector/ProjectSelector.hook.ts
+
+import { createEffect, createSignal, onCleanup, onMount } from "solid-js";
+import { useAppShellData } from "../../app-shell/data/app-shell.context";
+import {
+	createProjectFolderTarget,
+	createProjectSurfaceTarget,
+	createProjectTarget,
+	type ProjectItem,
+	type ProjectMenuTarget,
+} from "../../app-shell/data/shell.data";
+import {
+	collectBranchNodeIds,
+	findTreeNodeDepth,
+	findTreeNodeLocation,
+	getPointerRelativeY,
+	isUuidString,
+	moveTreeNode,
+	resolveTreeDropTarget,
+} from "../shared/navTreeDnd";
+import { createProjectContextMenuController } from "../ProjectContextMenu/createProjectContextMenuController";
+import {
+	LONG_PRESS_MS,
+	buildProjectTree,
+	countProjectFolderSiblingsBeforeIndex,
+	projectTreeAdapter,
+	readPersistedFolders,
+	type DragGhostPosition,
+	type PendingProjectFolderDraft,
+	type PendingProjectFolderRename,
+	type PersistedProjectFolderRecord,
+	type ProjectDragState,
+	type ProjectFolderNode,
+	type ProjectSelectorProps,
+	type ProjectTreeNode,
+} from "./ProjectSelector.data";
+import {
+	createProjectFolderRequest,
+	deleteProjectFolderRequest,
+	fetchProjectFolders,
+	isValidProjectFolderProjectId,
+	moveProjectFolderRequest,
+	renameProjectFolderRequest,
+} from "./projectFolders.api";
+
+export const useProjectSelector = (props: ProjectSelectorProps) => {
+	const appShellData = useAppShellData();
+	const [selectedProject, setSelectedProject] = createSignal(appShellData.activeProject());
+	const [drawerTop, setDrawerTop] = createSignal<number>(0);
+	const [collapsedFolderIds, setCollapsedFolderIds] = createSignal<readonly string[]>([]);
+	const [persistedFolders, setPersistedFolders] = createSignal<readonly PersistedProjectFolderRecord[]>([]);
+	const [projectTreeNodes, setProjectTreeNodes] = createSignal<ProjectTreeNode[]>(buildProjectTree(appShellData.projectItems(), persistedFolders()));
+	const [pendingFolderDraft, setPendingFolderDraft] = createSignal<PendingProjectFolderDraft | null>(null);
+	const [pendingFolderName, setPendingFolderName] = createSignal("");
+	const [pendingFolderRename, setPendingFolderRename] = createSignal<PendingProjectFolderRename | null>(null);
+	const [pendingFolderRenameName, setPendingFolderRenameName] = createSignal("");
+	const [dragState, setDragState] = createSignal<ProjectDragState | null>(null);
+	const [dragGhostPosition, setDragGhostPosition] = createSignal<DragGhostPosition>({ x: 0, y: 0 });
+	const [suppressNextTreeClick, setSuppressNextTreeClick] = createSignal(false);
+	let rootRef: HTMLDivElement | undefined;
+	let triggerRef: HTMLButtonElement | undefined;
+	let contextMenuRef: HTMLDivElement | undefined;
+	let longPressTimer: number | undefined;
+	let suppressClickTimer: number | undefined;
+	let lastSelectedProjectId: string | null = null;
+	let latestPersistedFoldersRequest = 0;
+	const contextMenu = createProjectContextMenuController();
+
+	const setRootRef = (element: HTMLDivElement | undefined): void => {
+		rootRef = element;
+	};
+
+	const setTriggerRef = (element: HTMLButtonElement | undefined): void => {
+		triggerRef = element;
+	};
+
+	const setContextMenuElement = (element: HTMLDivElement | undefined): void => {
+		contextMenuRef = element;
+		if (element) {
+			contextMenu.setMenuRef(element);
+		}
+	};
+
+	const clearLongPressTimer = (): void => {
+		if (longPressTimer !== undefined) {
+			window.clearTimeout(longPressTimer);
+			longPressTimer = undefined;
+		}
+	};
+
+	const updateDragGhostPosition = (x: number, y: number): void => {
+		setDragGhostPosition({ x: x + 18, y: y + 18 });
+	};
+
+	const draggedNode = (): ProjectTreeNode | null => {
+		const currentDragState = dragState();
+		if (!currentDragState) {
+			return null;
+		}
+
+		return findTreeNodeLocation(projectTreeNodes(), currentDragState.draggedNodeId, projectTreeAdapter)?.node ?? null;
+	};
+
+	const draggedNodeMeta = (): string => {
+		const node = draggedNode();
+		if (!node) {
+			return "";
+		}
+
+		return node.kind === "folder" ? "Folder" : "Project";
+	};
+
+	const suppressTreeClickTemporarily = (): void => {
+		setSuppressNextTreeClick(true);
+
+		if (suppressClickTimer !== undefined) {
+			window.clearTimeout(suppressClickTimer);
+		}
+
+		suppressClickTimer = window.setTimeout(() => {
+			setSuppressNextTreeClick(false);
+			suppressClickTimer = undefined;
+		}, 80);
+	};
+
+	const isFolderCollapsed = (folderId: string): boolean => collapsedFolderIds().includes(folderId);
+
+	const toggleFolder = (folderId: string): void => {
+		setCollapsedFolderIds((current) => (current.includes(folderId) ? current.filter((id) => id !== folderId) : [...current, folderId]));
+	};
+
+	const syncProjectTree = (): void => {
+		const nextTree = buildProjectTree(appShellData.projectItems(), persistedFolders());
+		const availableFolderIds = new Set(collectBranchNodeIds(nextTree, projectTreeAdapter));
+
+		setProjectTreeNodes(nextTree);
+		setCollapsedFolderIds((current) => current.filter((folderId) => availableFolderIds.has(folderId)));
+	};
+
+	const resetProjectTreeInteractionState = (): void => {
+		setCollapsedFolderIds([]);
+		setPendingFolderDraft(null);
+		setPendingFolderName("");
+		setPendingFolderRename(null);
+		setPendingFolderRenameName("");
+		setDragState(null);
+	};
+
+	const folderIds = (): string[] => collectBranchNodeIds(projectTreeNodes(), projectTreeAdapter);
+
+	const expandAllFolders = (): void => {
+		setCollapsedFolderIds([]);
+	};
+
+	const collapseAllFolders = (): void => {
+		setCollapsedFolderIds(folderIds());
+	};
+
+	const totalFolderCount = (): number => folderIds().length;
+
+	const areAllFoldersCollapsed = (): boolean => {
+		const folderCount = totalFolderCount();
+		return folderCount > 0 && collapsedFolderIds().length >= folderCount;
+	};
+
+	const toggleAllFolders = (): void => {
+		if (areAllFoldersCollapsed()) {
+			expandAllFolders();
+			return;
+		}
+
+		collapseAllFolders();
+	};
+
+	const loadPersistedFolders = async (projectId: string): Promise<void> => {
+		const requestId = latestPersistedFoldersRequest + 1;
+		latestPersistedFoldersRequest = requestId;
+
+		if (!isValidProjectFolderProjectId(projectId) || !isUuidString(projectId)) {
+			setPersistedFolders([]);
+			return;
+		}
+
+		try {
+			const body = await fetchProjectFolders(projectId);
+
+			if (requestId !== latestPersistedFoldersRequest) {
+				return;
+			}
+
+			setPersistedFolders(readPersistedFolders(body));
+		} catch (error) {
+			if (requestId !== latestPersistedFoldersRequest) {
+				return;
+			}
+
+			console.error(error);
+			setPersistedFolders([]);
+		}
+	};
+
+	createEffect(() => {
+		setSelectedProject(appShellData.activeProject());
+	});
+
+	createEffect(() => {
+		syncProjectTree();
+	});
+
+	createEffect(() => {
+		const projectId = selectedProject().id;
+
+		if (lastSelectedProjectId === null) {
+			lastSelectedProjectId = projectId;
+			return;
+		}
+
+		if (projectId === lastSelectedProjectId) {
+			return;
+		}
+
+		lastSelectedProjectId = projectId;
+		resetProjectTreeInteractionState();
+	});
+
+	createEffect(() => {
+		void loadPersistedFolders(selectedProject().id);
+	});
+
+	onMount(() => {
+		if (triggerRef) {
+			const updateDrawerTop = (): void => {
+				if (!triggerRef) {
+					return;
+				}
+
+				setDrawerTop(triggerRef.offsetTop + triggerRef.offsetHeight + 8);
+			};
+
+			updateDrawerTop();
+
+			const observer = new ResizeObserver(() => {
+				updateDrawerTop();
+			});
+
+			observer.observe(triggerRef);
+			window.addEventListener("resize", updateDrawerTop);
+
+			onCleanup(() => {
+				observer.disconnect();
+				window.removeEventListener("resize", updateDrawerTop);
+			});
+		}
+
+		const handlePointerDown = (event: PointerEvent): void => {
+			if (!props.isOpen || !rootRef) {
+				return;
+			}
+
+			const target = event.target;
+
+			if (target instanceof Node && rootRef.contains(target)) {
+				return;
+			}
+
+			if (target instanceof Node && contextMenuRef?.contains(target)) {
+				return;
+			}
+
+			props.onClose();
+		};
+
+		const handlePointerUp = (): void => {
+			clearLongPressTimer();
+
+			const nextDragState = dragState();
+
+			if (!nextDragState?.dropTarget) {
+				if (nextDragState) {
+					suppressTreeClickTemporarily();
+				}
+				setDragState(null);
+				return;
+			}
+
+			suppressTreeClickTemporarily();
+
+			const currentNodes = projectTreeNodes();
+			const draggedLocation = findTreeNodeLocation(currentNodes, nextDragState.draggedNodeId, projectTreeAdapter);
+			const canPersistMove = isUuidString(selectedProject().id);
+			const draggedFolderPath = draggedLocation?.node.kind === "folder" ? draggedLocation.node.path : null;
+			const previewNodes = moveTreeNode(currentNodes, nextDragState.draggedNodeId, nextDragState.dropTarget, projectTreeAdapter);
+			const previewLocation = findTreeNodeLocation(previewNodes, nextDragState.draggedNodeId, projectTreeAdapter);
+			const persistedParentLocation = previewLocation?.parentId ? findTreeNodeLocation(previewNodes, previewLocation.parentId, projectTreeAdapter) : null;
+			const persistedParentFolderPath = persistedParentLocation?.node.kind === "folder" ? persistedParentLocation.node.path : null;
+			const previewSiblings = previewLocation?.parentId ? persistedParentLocation?.node.kind === "folder" ? persistedParentLocation.node.children : [] : previewNodes;
+			const targetIndex = previewLocation ? countProjectFolderSiblingsBeforeIndex(previewSiblings, previewLocation.index) : 0;
+
+			if (canPersistMove && draggedLocation?.node.kind === "folder" && draggedFolderPath && (!previewLocation?.parentId || persistedParentLocation?.node.kind === "folder")) {
+				void movePersistedFolder(
+					draggedFolderPath,
+					persistedParentFolderPath,
+					draggedLocation.node.id,
+					persistedParentLocation?.node.kind === "folder" ? persistedParentLocation.node.id : null,
+					targetIndex,
+				);
+			} else {
+				setProjectTreeNodes((current) => moveTreeNode(current, nextDragState.draggedNodeId, nextDragState.dropTarget!, projectTreeAdapter));
+			}
+
+			setDragState(null);
+		};
+
+		const handleEscape = (event: KeyboardEvent): void => {
+			if (event.key !== "Escape") {
+				return;
+			}
+
+			clearLongPressTimer();
+
+			if (dragState()) {
+				setDragState(null);
+				return;
+			}
+
+			if (!props.isOpen) {
+				return;
+			}
+
+			props.onClose();
+			triggerRef?.focus();
+		};
+
+		const handlePointerMove = (event: PointerEvent): void => {
+			if (!dragState()) {
+				return;
+			}
+
+			updateDragGhostPosition(event.clientX, event.clientY);
+		};
+
+		document.addEventListener("pointerdown", handlePointerDown);
+		window.addEventListener("pointerup", handlePointerUp);
+		window.addEventListener("pointercancel", handlePointerUp);
+		window.addEventListener("pointermove", handlePointerMove);
+		window.addEventListener("keydown", handleEscape);
+
+		onCleanup(() => {
+			clearLongPressTimer();
+			if (suppressClickTimer !== undefined) {
+				window.clearTimeout(suppressClickTimer);
+			}
+			document.removeEventListener("pointerdown", handlePointerDown);
+			window.removeEventListener("pointerup", handlePointerUp);
+			window.removeEventListener("pointercancel", handlePointerUp);
+			window.removeEventListener("pointermove", handlePointerMove);
+			window.removeEventListener("keydown", handleEscape);
+		});
+	});
+
+	const toggleOpen = (): void => {
+		if (!props.isOpen) {
+			props.onToggle();
+			return;
+		}
+
+		props.onClose();
+	};
+
+	const selectProject = (projectId: string): void => {
+		const location = findTreeNodeLocation(projectTreeNodes(), projectId, projectTreeAdapter);
+
+		if (!location || location.node.kind !== "project") {
+			return;
+		}
+
+		setSelectedProject({ id: location.node.item.id, name: location.node.item.name });
+		props.onClose();
+	};
+
+	const beginFolderDraft = (parentId: string | null, depth: number): void => {
+		if (parentId) {
+			setCollapsedFolderIds((current) => current.filter((id) => id !== parentId));
+		}
+
+		setPendingFolderRename(null);
+		setPendingFolderRenameName("");
+		setPendingFolderName("");
+		setPendingFolderDraft({ parentId, depth });
+	};
+
+	const beginFolderRename = (folderId: string, label: string, depth: number): void => {
+		setPendingFolderDraft(null);
+		setPendingFolderName("");
+		setPendingFolderRename({ folderId, depth });
+		setPendingFolderRenameName(label);
+	};
+
+	const resolveFolderPath = (folderId: string): string | null => {
+		const location = findTreeNodeLocation(projectTreeNodes(), folderId, projectTreeAdapter);
+		return location && location.node.kind === "folder" ? location.node.path : null;
+	};
+
+	const submitPendingFolder = async (): Promise<void> => {
+		const name = pendingFolderName().trim();
+		const draft = pendingFolderDraft();
+		const projectId = selectedProject().id;
+
+		if (!draft) {
+			return;
+		}
+
+		if (!name) {
+			setPendingFolderDraft(null);
+			setPendingFolderName("");
+			return;
+		}
+
+		if (!isUuidString(projectId)) {
+			cancelPendingFolder();
+			return;
+		}
+
+		const parentFolderPath = draft.parentId ? resolveFolderPath(draft.parentId) : null;
+		if (draft.parentId && !parentFolderPath) {
+			cancelPendingFolder();
+			return;
+		}
+
+		try {
+			const body = await createProjectFolderRequest(projectId, name, parentFolderPath);
+
+			setPersistedFolders(readPersistedFolders(body));
+			setPendingFolderDraft(null);
+			setPendingFolderName("");
+		} catch (error) {
+			console.error(error);
+		}
+	};
+
+	const deletePersistedFolder = async (folderId: string): Promise<void> => {
+		const projectId = selectedProject().id;
+		if (!folderId || !isUuidString(projectId)) {
+			return;
+		}
+
+		const folderPath = resolveFolderPath(folderId);
+		if (!folderPath) {
+			return;
+		}
+
+		try {
+			const body = await deleteProjectFolderRequest(projectId, folderPath);
+
+			setPersistedFolders(readPersistedFolders(body));
+			setCollapsedFolderIds((current) => current.filter((id) => id !== folderId));
+		} catch (error) {
+			console.error(error);
+		}
+	};
+
+	const movePersistedFolder = async (
+		folderPath: string,
+		parentFolderPath: string | null,
+		folderStableId: string,
+		parentStableId: string | null,
+		targetIndex: number,
+	): Promise<void> => {
+		const projectId = selectedProject().id;
+		if (!folderPath || !folderStableId || !isUuidString(projectId)) {
+			return;
+		}
+
+		try {
+			const body = await moveProjectFolderRequest(projectId, {
+				folderId: folderPath,
+				folderNodeId: folderStableId,
+				parentFolderId: parentFolderPath,
+				parentNodeId: parentStableId,
+				targetIndex,
+			});
+
+			setPersistedFolders(readPersistedFolders(body));
+		} catch (error) {
+			console.error(error);
+		}
+	};
+
+	const submitPendingFolderRename = async (): Promise<void> => {
+		const draft = pendingFolderRename();
+		const name = pendingFolderRenameName().trim();
+		const projectId = selectedProject().id;
+
+		if (!draft) {
+			return;
+		}
+
+		if (!name) {
+			setPendingFolderRename(null);
+			setPendingFolderRenameName("");
+			return;
+		}
+
+		if (!isUuidString(projectId)) {
+			cancelPendingFolderRename();
+			return;
+		}
+
+		const folderPath = resolveFolderPath(draft.folderId);
+		if (!folderPath) {
+			cancelPendingFolderRename();
+			return;
+		}
+
+		try {
+			const body = await renameProjectFolderRequest(projectId, folderPath, name);
+
+			setPersistedFolders(readPersistedFolders(body));
+			setPendingFolderRename(null);
+			setPendingFolderRenameName("");
+		} catch (error) {
+			console.error(error);
+		}
+	};
+
+	const cancelPendingFolder = (): void => {
+		setPendingFolderDraft(null);
+		setPendingFolderName("");
+	};
+
+	const cancelPendingFolderRename = (): void => {
+		setPendingFolderRename(null);
+		setPendingFolderRenameName("");
+	};
+
+	const handleContextActionSelect = (action: { id: string; label: string }, target: ProjectMenuTarget): void => {
+		switch (action.id) {
+			case "new-folder":
+				switch (target.kind) {
+					case "surface":
+						beginFolderDraft(null, 0);
+						return;
+					case "folder":
+						beginFolderDraft(target.id, (findTreeNodeDepth(projectTreeNodes(), target.id, projectTreeAdapter) ?? 0) + 1);
+						return;
+					case "project": {
+						const parentId = findTreeNodeLocation(projectTreeNodes(), target.id, projectTreeAdapter)?.parentId ?? null;
+						beginFolderDraft(parentId, parentId ? (findTreeNodeDepth(projectTreeNodes(), parentId, projectTreeAdapter) ?? 0) + 1 : 0);
+						return;
+					}
+				}
+				return;
+			case "delete-folder":
+				if (target.kind === "folder") {
+					void deletePersistedFolder(target.id);
+				}
+				return;
+			case "rename-folder":
+				if (target.kind === "folder") {
+					beginFolderRename(target.id, target.label, findTreeNodeDepth(projectTreeNodes(), target.id, projectTreeAdapter) ?? 0);
+				}
+				return;
+			default:
+				return;
+		}
+	};
+
+	const handleSurfaceContextMenu = (event: MouseEvent): void => {
+		event.stopPropagation();
+		contextMenu.openMenu(event, createProjectSurfaceTarget("Projects"));
+	};
+
+	const openRootCreateMenu = (element: HTMLElement): void => {
+		contextMenu.openMenuFromElement(element, createProjectSurfaceTarget("Projects"));
+	};
+
+	const treeControlLabel = (): string => (areAllFoldersCollapsed() ? "Expand all folders" : "Collapse all folders");
+
+	const handleNodePointerDown = (event: PointerEvent, nodeId: string): void => {
+		if (event.button !== 0 || pendingFolderDraft()) {
+			return;
+		}
+
+		updateDragGhostPosition(event.clientX, event.clientY);
+		clearLongPressTimer();
+		longPressTimer = window.setTimeout(() => {
+			suppressTreeClickTemporarily();
+			setDragState({ draggedNodeId: nodeId, dropTarget: null });
+		}, LONG_PRESS_MS);
+	};
+
+	const handleNodePointerMove = (event: PointerEvent, parentId: string | null, index: number, node: ProjectTreeNode): void => {
+		const nextDragState = dragState();
+
+		if (!nextDragState || nextDragState.draggedNodeId === (node.kind === "folder" ? node.id : node.item.id)) {
+			return;
+		}
+
+		const relativeY = getPointerRelativeY(event);
+		if (relativeY === null) {
+			return;
+		}
+
+		setDragState({
+			...nextDragState,
+			dropTarget: resolveTreeDropTarget({
+				parentId,
+				index,
+				node,
+				relativeY,
+				adapter: projectTreeAdapter,
+			}),
+		});
+	};
+
+	const openFolderMenu = (event: MouseEvent, folder: ProjectFolderNode): void => {
+		event.stopPropagation();
+		contextMenu.openMenu(event, createProjectFolderTarget(folder.id, folder.label));
+	};
+
+	const openProjectMenu = (event: MouseEvent, item: ProjectItem): void => {
+		event.stopPropagation();
+		contextMenu.openMenu(event, createProjectTarget(item));
+	};
+
+	const contextMenuPosition = () => {
+		const state = contextMenu.menuState();
+		return state ? { x: state.x, y: state.y } : null;
+	};
+
+	return {
+		selectedProject,
+		drawerTop,
+		setRootRef,
+		setTriggerRef,
+		setContextMenuElement,
+		toggleOpen,
+		handleSurfaceContextMenu,
+		openRootCreateMenu,
+		treeControlLabel,
+		toggleAllFolders,
+		totalFolderCount,
+		areAllFoldersCollapsed,
+		projectTreeNodes,
+		isFolderCollapsed,
+		toggleFolder,
+		selectProject,
+		openFolderMenu,
+		openProjectMenu,
+		handleNodePointerDown,
+		handleNodePointerMove,
+		pendingFolderDraft,
+		pendingFolderName,
+		setPendingFolderName,
+		submitPendingFolder,
+		cancelPendingFolder,
+		pendingFolderRename,
+		pendingFolderRenameName,
+		setPendingFolderRenameName,
+		submitPendingFolderRename,
+		cancelPendingFolderRename,
+		dragState,
+		suppressNextTreeClick,
+		contextMenu,
+		contextMenuPosition,
+		handleContextActionSelect,
+		draggedNode,
+		dragGhostPosition,
+		draggedNodeMeta,
+	};
+};

Frontend/src/components/workspace-navigation/ProjectSelector/ProjectSelector.parts.tsx

@@ -0,0 +1,213 @@
+// Path: Frontend/src/components/workspace-navigation/ProjectSelector/ProjectSelector.parts.tsx
+
+import { For, Show, type JSX } from "solid-js";
+import { ChevronRight, Folder, LayoutGrid } from "../../../lib/icons";
+import type { ProjectItem } from "../../app-shell/data/shell.data";
+import {
+	getProjectTreeNodeId,
+	type PendingProjectFolderDraft,
+	type PendingProjectFolderRename,
+	type ProjectDragState,
+	type ProjectFolderBranchProps,
+	type ProjectFolderNode,
+	type ProjectTreeNode,
+} from "./ProjectSelector.data";
+import styles from "./ProjectSelector.module.scss";
+
+export const ProjectFolderDraftRow = (props: {
+	depth: number;
+	value: string;
+	onInput: (value: string) => void;
+	onSubmit: () => void;
+	onCancel: () => void;
+}): JSX.Element => {
+	let inputRef: HTMLInputElement | undefined;
+
+	queueMicrotask(() => inputRef?.focus());
+
+	return (
+		<li>
+			<div class={styles.treeInputRow} style={{ "--tree-depth": String(props.depth) }}>
+				<Folder class={styles.icon} size={18} strokeWidth={2} />
+				<input
+					ref={inputRef}
+					type="text"
+					class={styles.treeInput}
+					value={props.value}
+					placeholder="Folder name"
+					onInput={(event): void => props.onInput(event.currentTarget.value)}
+					onBlur={props.onSubmit}
+					onKeyDown={(event): void => {
+						if (event.key === "Enter") {
+							event.preventDefault();
+							event.currentTarget.blur();
+							return;
+						}
+
+						if (event.key === "Escape") {
+							event.preventDefault();
+							props.onCancel();
+							event.currentTarget.blur();
+						}
+					}}
+				/>
+			</div>
+		</li>
+	);
+};
+
+export const ProjectFolderBranch = (props: ProjectFolderBranchProps): JSX.Element => (
+	<ul class={styles.treeList} role="list">
+		<Show when={props.nodes.length === 0 && props.pendingFolderDraft?.parentId !== props.parentId}>
+			<li>
+				<div class={styles.treeEmptySlot} style={{ "--tree-depth": String(props.depth) }} />
+			</li>
+		</Show>
+
+		<For each={props.nodes}>
+			{(node, indexAccessor): JSX.Element => {
+				const nodeId = (): string => getProjectTreeNodeId(node);
+				const isDraggedNode = (): boolean => props.dragState?.draggedNodeId === nodeId();
+				const dropIntent = (): "before" | "after" | "inside" | null => {
+					if (props.dragState?.dropTarget?.targetNodeId !== nodeId()) {
+						return null;
+					}
+
+					return props.dragState.dropTarget.intent;
+				};
+
+				if (node.kind === "folder") {
+					const isCollapsed = (): boolean => props.isFolderCollapsed(node.id);
+					const isRenaming = (): boolean => props.pendingFolderRename?.folderId === node.id;
+
+					return (
+						<li>
+							<Show
+								when={isRenaming()}
+								fallback={
+									<button
+										type="button"
+										classList={{
+											[styles.treeItem]: true,
+											[styles.treeItemFolder]: true,
+											[styles.treeItemDragging]: isDraggedNode(),
+											[styles.treeItemDropBefore]: dropIntent() === "before",
+											[styles.treeItemDropAfter]: dropIntent() === "after",
+											[styles.treeItemDropInside]: dropIntent() === "inside",
+										}}
+										style={{ "--tree-depth": String(props.depth) }}
+										aria-expanded={!isCollapsed()}
+										onClick={() => {
+											if (props.dragState || props.isTreeClickSuppressed()) {
+												return;
+											}
+
+											props.onToggleFolder(node.id);
+										}}
+										onContextMenu={(event): void => props.onOpenFolderMenu(event, node)}
+										onPointerDown={(event): void => props.onNodePointerDown(event, node.id)}
+										onPointerMove={(event): void => props.onNodePointerMove(event, props.parentId, indexAccessor(), node)}
+										onPointerEnter={(event): void => props.onNodePointerMove(event, props.parentId, indexAccessor(), node)}
+									>
+										<ChevronRight
+											classList={{
+												[styles.folderChevron]: true,
+												[styles.folderChevronOpen]: !isCollapsed(),
+											}}
+											size={16}
+											strokeWidth={2}
+										/>
+										<Folder class={styles.icon} size={18} strokeWidth={2} />
+										<span class={styles.label}>{node.label}</span>
+										<Show when={node.meta}>
+											<span class={styles.itemMeta}>{node.meta}</span>
+										</Show>
+									</button>
+								}
+							>
+								<ProjectFolderDraftRow
+									depth={props.pendingFolderRename?.depth ?? props.depth}
+									value={props.pendingFolderRenameName}
+									onInput={props.onPendingFolderRenameChange}
+									onSubmit={props.onSubmitPendingFolderRename}
+									onCancel={props.onCancelPendingFolderRename}
+								/>
+							</Show>
+
+							<Show when={!isCollapsed() && ((node.children?.length ?? 0) > 0 || props.pendingFolderDraft?.parentId === node.id)}>
+								<ProjectFolderBranch
+									nodes={node.children}
+									depth={props.depth + 1}
+									parentId={node.id}
+									selectedProjectId={props.selectedProjectId}
+									isFolderCollapsed={props.isFolderCollapsed}
+									onToggleFolder={props.onToggleFolder}
+									onSelectProject={props.onSelectProject}
+									onOpenFolderMenu={props.onOpenFolderMenu}
+									onOpenProjectMenu={props.onOpenProjectMenu}
+									onNodePointerDown={props.onNodePointerDown}
+									onNodePointerMove={props.onNodePointerMove}
+									pendingFolderDraft={props.pendingFolderDraft}
+									pendingFolderName={props.pendingFolderName}
+									onPendingFolderNameChange={props.onPendingFolderNameChange}
+									onSubmitPendingFolder={props.onSubmitPendingFolder}
+									onCancelPendingFolder={props.onCancelPendingFolder}
+									pendingFolderRename={props.pendingFolderRename}
+									pendingFolderRenameName={props.pendingFolderRenameName}
+									onPendingFolderRenameChange={props.onPendingFolderRenameChange}
+									onSubmitPendingFolderRename={props.onSubmitPendingFolderRename}
+									onCancelPendingFolderRename={props.onCancelPendingFolderRename}
+									dragState={props.dragState}
+									isTreeClickSuppressed={props.isTreeClickSuppressed}
+								/>
+							</Show>
+						</li>
+					);
+				}
+
+				return (
+					<li>
+						<button
+							type="button"
+							classList={{
+								[styles.treeItem]: true,
+								[styles.treeItemActive]: props.selectedProjectId === node.item.id,
+								[styles.treeItemDragging]: isDraggedNode(),
+								[styles.treeItemDropBefore]: dropIntent() === "before",
+								[styles.treeItemDropAfter]: dropIntent() === "after",
+							}}
+							style={{ "--tree-depth": String(props.depth) }}
+							onClick={(): void => {
+								if (props.dragState || props.isTreeClickSuppressed()) {
+									return;
+								}
+
+								props.onSelectProject(node.item.id);
+							}}
+							onContextMenu={(event): void => props.onOpenProjectMenu(event, node.item)}
+							onPointerDown={(event): void => props.onNodePointerDown(event, node.item.id)}
+							onPointerMove={(event): void => props.onNodePointerMove(event, props.parentId, indexAccessor(), node)}
+							onPointerEnter={(event): void => props.onNodePointerMove(event, props.parentId, indexAccessor(), node)}
+						>
+							<LayoutGrid class={styles.icon} size={18} strokeWidth={2} />
+							<span class={styles.label}>{node.item.name}</span>
+							<Show when={node.item.meta}>
+								<span class={styles.itemMeta}>{node.item.meta}</span>
+							</Show>
+						</button>
+					</li>
+				);
+			}}
+		</For>
+
+		<Show when={props.pendingFolderDraft?.parentId === props.parentId}>
+			<ProjectFolderDraftRow
+				depth={props.pendingFolderDraft?.depth ?? props.depth}
+				value={props.pendingFolderName}
+				onInput={props.onPendingFolderNameChange}
+				onSubmit={props.onSubmitPendingFolder}
+				onCancel={props.onCancelPendingFolder}
+			/>
+		</Show>
+	</ul>
+);

Frontend/src/components/workspace-navigation/ProjectSelector/ProjectSelector.tsx

@@ -0,0 +1,222 @@
+// Path: Frontend/src/components/workspace-navigation/ProjectSelector/ProjectSelector.tsx
+
+import { Show, type JSX } from "solid-js";
+import { Portal } from "solid-js/web";
+import { ChevronDown, ChevronRight, Folder, LayoutGrid, ListCollapse, Plus, UnfoldVertical } from "../../../lib/icons";
+import { ProjectContextMenu } from "../ProjectContextMenu/ProjectContextMenu";
+import { useProjectSelector } from "./ProjectSelector.hook";
+import { ProjectFolderBranch } from "./ProjectSelector.parts";
+import { type ProjectSelectorProps } from "./ProjectSelector.data";
+import styles from "./ProjectSelector.module.scss";
+
+export const ProjectSelector = (props: ProjectSelectorProps): JSX.Element => {
+	const {
+		selectedProject,
+		drawerTop,
+		setRootRef,
+		setTriggerRef,
+		setContextMenuElement,
+		toggleOpen,
+		handleSurfaceContextMenu,
+		openRootCreateMenu,
+		treeControlLabel,
+		toggleAllFolders,
+		totalFolderCount,
+		areAllFoldersCollapsed,
+		projectTreeNodes,
+		isFolderCollapsed,
+		toggleFolder,
+		selectProject,
+		openFolderMenu,
+		openProjectMenu,
+		handleNodePointerDown,
+		handleNodePointerMove,
+		pendingFolderDraft,
+		pendingFolderName,
+		setPendingFolderName,
+		submitPendingFolder,
+		cancelPendingFolder,
+		pendingFolderRename,
+		pendingFolderRenameName,
+		setPendingFolderRenameName,
+		submitPendingFolderRename,
+		cancelPendingFolderRename,
+		dragState,
+		suppressNextTreeClick,
+		contextMenu,
+		contextMenuPosition,
+		handleContextActionSelect,
+		draggedNode,
+		dragGhostPosition,
+		draggedNodeMeta,
+	} = useProjectSelector(props);
+
+	return (
+		<div
+			ref={setRootRef}
+			classList={{
+				[styles.root]: true,
+				[styles.rootCompact]: !!props.compact,
+				[styles.rootDragMode]: !!dragState(),
+			}}
+			style={{
+				"--project-drawer-top": `${drawerTop()}px`,
+			}}
+		>
+			<button
+				type="button"
+				ref={setTriggerRef}
+				classList={{
+					[styles.trigger]: true,
+					[styles.triggerCompact]: !!props.compact,
+					[styles.triggerOpen]: props.isOpen,
+				}}
+				aria-label={`Open project menu for ${selectedProject().name}`}
+				aria-expanded={props.isOpen}
+				aria-haspopup="menu"
+				title={selectedProject().name}
+				onClick={toggleOpen}
+			>
+				<span class={styles.triggerLead} aria-hidden="true">
+					<Folder size={18} strokeWidth={2} />
+				</span>
+				{!props.compact ? (
+					<span class={styles.triggerCopy}>
+						<span class={styles.eyebrow}>Projects</span>
+						<span class={styles.value}>{selectedProject().name}</span>
+					</span>
+				) : null}
+				<ChevronDown
+					classList={{
+						[styles.triggerIcon]: true,
+						[styles.triggerIconOpen]: props.isOpen,
+					}}
+					size={16}
+					strokeWidth={2}
+				/>
+			</button>
+
+			<Show when={props.isOpen}>
+				<>
+					<button
+						type="button"
+						classList={{
+							[styles.scrim]: true,
+							[styles.scrimOpen]: props.isOpen,
+						}}
+						aria-hidden={!props.isOpen}
+						tabIndex={props.isOpen ? 0 : -1}
+						onClick={props.onClose}
+					/>
+
+					<div
+						classList={{
+							[styles.drawer]: true,
+							[styles.drawerOpen]: props.isOpen,
+						}}
+						aria-hidden={!props.isOpen}
+						onContextMenu={handleSurfaceContextMenu}
+					>
+						<div class={styles.drawerBody}>
+							<div class={styles.treeSectionHeader}>
+								<Show when={!props.compact}>
+									<div class={styles.treeSectionLabel}>Projects</div>
+								</Show>
+
+								<div class={styles.treeControls}>
+									<button
+										type="button"
+										class={styles.treeControlButton}
+										onClick={(event): void => {
+											event.stopPropagation();
+											openRootCreateMenu(event.currentTarget);
+										}}
+										aria-label="Create in Projects"
+										title="Create"
+									>
+										<Plus size={16} strokeWidth={2.25} />
+									</button>
+									<button
+										type="button"
+										class={styles.treeControlButton}
+										onClick={toggleAllFolders}
+										aria-label={treeControlLabel()}
+										title={treeControlLabel()}
+										disabled={totalFolderCount() === 0}
+									>
+										<Show
+											when={areAllFoldersCollapsed()}
+											fallback={<ListCollapse size={16} strokeWidth={2} />}
+										>
+											<UnfoldVertical size={16} strokeWidth={2} />
+										</Show>
+									</button>
+								</div>
+							</div>
+
+							<ProjectFolderBranch
+								nodes={projectTreeNodes()}
+								depth={0}
+								parentId={null}
+								selectedProjectId={selectedProject().id}
+								isFolderCollapsed={isFolderCollapsed}
+								onToggleFolder={toggleFolder}
+								onSelectProject={selectProject}
+								onOpenFolderMenu={openFolderMenu}
+								onOpenProjectMenu={openProjectMenu}
+								onNodePointerDown={handleNodePointerDown}
+								onNodePointerMove={handleNodePointerMove}
+								pendingFolderDraft={pendingFolderDraft()}
+								pendingFolderName={pendingFolderName()}
+								onPendingFolderNameChange={setPendingFolderName}
+								onSubmitPendingFolder={submitPendingFolder}
+								onCancelPendingFolder={cancelPendingFolder}
+								pendingFolderRename={pendingFolderRename()}
+								pendingFolderRenameName={pendingFolderRenameName()}
+								onPendingFolderRenameChange={setPendingFolderRenameName}
+								onSubmitPendingFolderRename={submitPendingFolderRename}
+								onCancelPendingFolderRename={cancelPendingFolderRename}
+								dragState={dragState()}
+								isTreeClickSuppressed={suppressNextTreeClick}
+							/>
+						</div>
+					</div>
+				</>
+			</Show>
+
+			<ProjectContextMenu
+				target={contextMenu.menuState()?.target ?? null}
+				position={contextMenuPosition()}
+				menuRef={setContextMenuElement}
+				onClose={contextMenu.closeMenu}
+				onSelect={handleContextActionSelect}
+			/>
+
+			<Show when={draggedNode()} keyed>
+				{(node): JSX.Element => {
+					const GhostIcon = node.kind === "folder" ? Folder : LayoutGrid;
+
+					return (
+						<Portal>
+							<div class={styles.dragGhostLayer} aria-hidden="true">
+								<div
+									class={styles.dragGhost}
+									style={{
+										"--drag-ghost-x": `${dragGhostPosition().x}px`,
+										"--drag-ghost-y": `${dragGhostPosition().y}px`,
+									}}
+								>
+									<GhostIcon class={styles.icon} size={18} strokeWidth={2} />
+									<div class={styles.dragGhostCopy}>
+										<div class={styles.dragGhostTitle}>{node.kind === "folder" ? node.label : node.item.name}</div>
+										<div class={styles.dragGhostMeta}>{draggedNodeMeta()}</div>
+									</div>
+								</div>
+							</div>
+						</Portal>
+					);
+				}}
+			</Show>
+		</div>
+	);
+};

Frontend/src/components/workspace-navigation/ProjectSelector/projectFolders.api.ts

@@ -0,0 +1,109 @@
+import { resolveAPIBase } from "../../../lib/api";
+import type { ProjectFoldersResponse } from "./ProjectSelector.data";
+
+const readProjectFoldersResponse = async (response: Response): Promise<ProjectFoldersResponse> =>
+	(await response.json()) as ProjectFoldersResponse;
+
+export const isValidProjectFolderProjectId = (projectId: string): boolean =>
+	Boolean(projectId);
+
+export const fetchProjectFolders = async (projectId: string): Promise<ProjectFoldersResponse> => {
+	const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/folders`, {
+		headers: { Accept: "application/json" },
+	});
+	const body = await readProjectFoldersResponse(response);
+
+	if (!response.ok) {
+		throw new Error(body.message || "Failed to load project folders.");
+	}
+
+	return body;
+};
+
+export const createProjectFolderRequest = async (
+	projectId: string,
+	name: string,
+	parentFolderId: string | null,
+): Promise<ProjectFoldersResponse> => {
+	const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/folders`, {
+		method: "POST",
+		headers: {
+			Accept: "application/json",
+			"Content-Type": "application/json",
+		},
+		body: JSON.stringify({ name, parentFolderId }),
+	});
+	const body = await readProjectFoldersResponse(response);
+
+	if (!response.ok) {
+		throw new Error(body.message || "Failed to create project folder.");
+	}
+
+	return body;
+};
+
+export const deleteProjectFolderRequest = async (
+	projectId: string,
+	folderId: string,
+): Promise<ProjectFoldersResponse> => {
+	const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/folders?folderId=${encodeURIComponent(folderId)}`, {
+		method: "DELETE",
+		headers: { Accept: "application/json" },
+	});
+	const body = await readProjectFoldersResponse(response);
+
+	if (!response.ok) {
+		throw new Error(body.message || "Failed to delete project folder.");
+	}
+
+	return body;
+};
+
+export const moveProjectFolderRequest = async (
+	projectId: string,
+	payload: {
+		folderId: string;
+		folderNodeId: string;
+		parentFolderId: string | null;
+		parentNodeId: string | null;
+		targetIndex: number;
+	},
+): Promise<ProjectFoldersResponse> => {
+	const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/folders/move`, {
+		method: "PATCH",
+		headers: {
+			Accept: "application/json",
+			"Content-Type": "application/json",
+		},
+		body: JSON.stringify(payload),
+	});
+	const body = await readProjectFoldersResponse(response);
+
+	if (!response.ok) {
+		throw new Error(body.message || "Failed to move project folder.");
+	}
+
+	return body;
+};
+
+export const renameProjectFolderRequest = async (
+	projectId: string,
+	folderId: string,
+	name: string,
+): Promise<ProjectFoldersResponse> => {
+	const response = await fetch(`${resolveAPIBase()}/projects/${projectId}/folders`, {
+		method: "PATCH",
+		headers: {
+			Accept: "application/json",
+			"Content-Type": "application/json",
+		},
+		body: JSON.stringify({ folderId, name }),
+	});
+	const body = await readProjectFoldersResponse(response);
+
+	if (!response.ok) {
+		throw new Error(body.message || "Failed to rename project folder.");
+	}
+
+	return body;
+};

Frontend/src/components/workspace-navigation/WorkspaceContextMenu/WorkspaceContextMenu.tsx

@@ -7,7 +7,7 @@ import {
 	type WorkspaceContextMenuAction,
 	type WorkspaceContextMenuShortcut,
 	type WorkspaceContextMenuTarget,
-} from "../data/shell.data";
+} from "../../app-shell/data/shell.data";
 import styles from "./WorkspaceContextMenu.module.scss";
 
 type ShortcutPlatform = "mac" | "windows";

Frontend/src/components/workspace-navigation/WorkspaceContextMenu/createWorkspaceContextMenuController.ts

@@ -1,5 +1,5 @@
 import { createEffect, createSignal, onCleanup } from "solid-js";
-import type { WorkspaceContextMenuTarget } from "../data/shell.data";
+import type { WorkspaceContextMenuTarget } from "../../app-shell/data/shell.data";
 
 type WorkspaceContextMenuState = {
 	target: WorkspaceContextMenuTarget;

Frontend/src/components/workspace-navigation/WorkspaceMobileActionSheet/WorkspaceMobileActionSheet.tsx

@@ -7,7 +7,7 @@ import {
 	type WorkspaceContextMenuAction,
 	type WorkspaceContextMenuSection,
 	type WorkspaceContextMenuTarget,
-} from "../data/shell.data";
+} from "../../app-shell/data/shell.data";
 import styles from "./WorkspaceMobileActionSheet.module.scss";
 
 type WorkspaceMobileActionSheetProps = {

Frontend/src/components/workspace-navigation/WorkspaceSidebar/WorkspaceSidebar.data.ts

@@ -0,0 +1,57 @@
+// Path: Frontend/src/components/workspace-navigation/WorkspaceSidebar/WorkspaceSidebar.data.ts
+
+import type { NavTreeAdapter, NavTreeDropTarget } from "../shared/navTreeDnd";
+import type { WorkspaceTreeNode } from "../../app-shell/data/shell.data";
+
+export type WorkspaceSidebarProps = {
+	collapsed: boolean;
+	railCollapsed: boolean;
+	onToggleRailCollapse: () => void;
+};
+
+export type PendingWorkspaceFolderDraft = {
+	parentId: string | null;
+	depth: number;
+};
+
+export type WorkspaceDragTarget = NavTreeDropTarget;
+
+export type WorkspaceDragState = {
+	draggedNodeId: string;
+	dropTarget: WorkspaceDragTarget | null;
+};
+
+export type DragGhostPosition = {
+	x: number;
+	y: number;
+};
+
+export type PendingWorkspaceFolderRename = {
+	folderId: string;
+	depth: number;
+};
+
+export const LONG_PRESS_MS = 320;
+
+export const getWorkspaceTreeNodeId = (node: WorkspaceTreeNode): string => node.id;
+
+export const countWorkspaceFolderSiblingsBeforeIndex = (
+	siblings: readonly WorkspaceTreeNode[],
+	index: number,
+): number => siblings.slice(0, index).filter((node) => node.kind === "folder").length;
+
+export const workspaceTreeAdapter: NavTreeAdapter<WorkspaceTreeNode> = {
+	getNodeId: getWorkspaceTreeNodeId,
+	isBranchNode: (node) => node.kind === "folder",
+	getChildren: (node) => (node.kind === "folder" ? (node.children ?? []) : []),
+	withChildren: (node, children) =>
+		node.kind === "folder"
+			? {
+				...node,
+				children: [...children],
+			}
+			: node,
+};
+
+export const isContextMenuKeyboardTrigger = (event: KeyboardEvent): boolean =>
+	event.key === "ContextMenu" || (event.shiftKey && event.key === "F10");

Frontend/src/components/workspace-navigation/WorkspaceSidebar/WorkspaceSidebar.hook.ts

@@ -0,0 +1,534 @@
+// Path: Frontend/src/components/workspace-navigation/WorkspaceSidebar/WorkspaceSidebar.hook.ts
+
+import { createEffect, createSignal, onCleanup, onMount } from "solid-js";
+import { useAppShellData } from "../../app-shell/data/app-shell.context";
+import {
+	createWorkspaceSurfaceTarget,
+	getWorkspaceItemTypeDefinition,
+	type WorkspaceContextMenuAction,
+	type WorkspaceContextMenuTarget,
+	type WorkspaceItemTypeId,
+	type WorkspaceTreeNode,
+} from "../../app-shell/data/shell.data";
+import {
+	collectBranchNodeIds,
+	findTreeNodeDepth,
+	findTreeNodeLocation,
+	getPointerRelativeY,
+	isUuidString,
+	moveTreeNode,
+	resolveTreeDropTarget,
+} from "../shared/navTreeDnd";
+import { useWorkspaceTreeData } from "../shared/useWorkspaceTreeData";
+import { createWorkspaceContextMenuController } from "../WorkspaceContextMenu/createWorkspaceContextMenuController";
+import {
+	countWorkspaceFolderSiblingsBeforeIndex,
+	getWorkspaceTreeNodeId,
+	LONG_PRESS_MS,
+	workspaceTreeAdapter,
+	type DragGhostPosition,
+	type PendingWorkspaceFolderDraft,
+	type PendingWorkspaceFolderRename,
+	type WorkspaceDragTarget,
+	type WorkspaceDragState,
+} from "./WorkspaceSidebar.data";
+
+export const useWorkspaceSidebar = () => {
+	const appShellData = useAppShellData();
+	const activeProject = () => appShellData.activeProject();
+	const [isProjectDrawerOpen, setIsProjectDrawerOpen] = createSignal(false);
+	const [collapsedFolderIds, setCollapsedFolderIds] = createSignal<readonly string[]>([]);
+	const [pendingFolderDraft, setPendingFolderDraft] = createSignal<PendingWorkspaceFolderDraft | null>(null);
+	const [pendingFolderName, setPendingFolderName] = createSignal("");
+	const [pendingFolderRename, setPendingFolderRename] = createSignal<PendingWorkspaceFolderRename | null>(null);
+	const [pendingFolderRenameName, setPendingFolderRenameName] = createSignal("");
+	const [dragState, setDragState] = createSignal<WorkspaceDragState | null>(null);
+	const [dragGhostPosition, setDragGhostPosition] = createSignal<DragGhostPosition>({ x: 0, y: 0 });
+	const [suppressNextTreeClick, setSuppressNextTreeClick] = createSignal(false);
+	let lastSelectedProjectId: string | null = null;
+	const {
+		workspaceTreeNodes,
+		setWorkspaceTreeNodes,
+		resolveFolderPath,
+		resolveItemPath,
+		createFolder,
+		renameFolder,
+		deleteFolder,
+		moveFolder,
+		createItem,
+		deleteItem,
+		moveItem,
+	} = useWorkspaceTreeData({
+		activeProjectId: () => activeProject()?.id ?? "",
+		fallbackWorkspaceTree: () => appShellData.workspaceTree(),
+	});
+	const contextMenu = createWorkspaceContextMenuController();
+	let longPressTimer: number | undefined;
+	let suppressClickTimer: number | undefined;
+	const sidebarContextMenuTarget = () => createWorkspaceSurfaceTarget(appShellData.activeProject());
+	const isFolderCollapsed = (folderId: string): boolean => collapsedFolderIds().includes(folderId);
+	const folderIds = (): string[] => collectBranchNodeIds(workspaceTreeNodes(), workspaceTreeAdapter);
+	const totalFolderCount = (): number => folderIds().length;
+	const areAllFoldersCollapsed = (): boolean => {
+		const count = totalFolderCount();
+		return count > 0 && collapsedFolderIds().length >= count;
+	};
+	const workspaceFolderToggleLabel = (): string =>
+		areAllFoldersCollapsed() ? "Expand all folders" : "Collapse all folders";
+	const toggleFolder = (folderId: string): void => {
+		setCollapsedFolderIds((current) =>
+			current.includes(folderId) ? current.filter((id) => id !== folderId) : [...current, folderId],
+		);
+	};
+	const expandAllFolders = (): void => {
+		setCollapsedFolderIds([]);
+	};
+	const collapseAllFolders = (): void => {
+		setCollapsedFolderIds(folderIds());
+	};
+	const toggleAllFolders = (): void => {
+		if (areAllFoldersCollapsed()) {
+			expandAllFolders();
+			return;
+		}
+
+		collapseAllFolders();
+	};
+	const resetWorkspaceTreeInteractionState = (): void => {
+		setCollapsedFolderIds([]);
+		setPendingFolderDraft(null);
+		setPendingFolderName("");
+		setPendingFolderRename(null);
+		setPendingFolderRenameName("");
+		setDragState(null);
+	};
+	const syncCollapsedFolderIds = (): void => {
+		const availableFolderIds = new Set(collectBranchNodeIds(workspaceTreeNodes(), workspaceTreeAdapter));
+		setCollapsedFolderIds((current) => current.filter((id) => availableFolderIds.has(id)));
+	};
+	const updateDragGhostPosition = (x: number, y: number): void => {
+		setDragGhostPosition({ x: x + 18, y: y + 18 });
+	};
+	const draggedNode = (): WorkspaceTreeNode | null => {
+		const currentDragState = dragState();
+		if (!currentDragState) {
+			return null;
+		}
+
+		return findTreeNodeLocation(workspaceTreeNodes(), currentDragState.draggedNodeId, workspaceTreeAdapter)?.node ?? null;
+	};
+	const draggedNodeMeta = (): string => {
+		const node = draggedNode();
+		if (!node) {
+			return "";
+		}
+
+		if (node.kind === "folder") {
+			return "Folder";
+		}
+
+		return getWorkspaceItemTypeDefinition(node.itemType).label;
+	};
+	const clearLongPressTimer = (): void => {
+		if (longPressTimer !== undefined) {
+			window.clearTimeout(longPressTimer);
+			longPressTimer = undefined;
+		}
+	};
+	const suppressTreeClickTemporarily = (): void => {
+		setSuppressNextTreeClick(true);
+
+		if (suppressClickTimer !== undefined) {
+			window.clearTimeout(suppressClickTimer);
+		}
+
+		suppressClickTimer = window.setTimeout(() => {
+			setSuppressNextTreeClick(false);
+			suppressClickTimer = undefined;
+		}, 80);
+	};
+
+	createEffect(() => {
+		syncCollapsedFolderIds();
+	});
+
+	createEffect(() => {
+		const projectId = activeProject()?.id ?? null;
+
+		if (lastSelectedProjectId === null) {
+			lastSelectedProjectId = projectId;
+			return;
+		}
+
+		if (projectId === lastSelectedProjectId) {
+			return;
+		}
+
+		lastSelectedProjectId = projectId;
+		resetWorkspaceTreeInteractionState();
+	});
+
+	onMount(() => {
+		const handlePointerMove = (event: PointerEvent): void => {
+			if (!dragState()) {
+				return;
+			}
+
+			updateDragGhostPosition(event.clientX, event.clientY);
+		};
+
+		const handlePointerUp = (): void => {
+			clearLongPressTimer();
+
+			const nextDragState = dragState();
+
+			if (!nextDragState?.dropTarget) {
+				if (nextDragState) {
+					suppressTreeClickTemporarily();
+				}
+				setDragState(null);
+				return;
+			}
+
+			suppressTreeClickTemporarily();
+
+			const currentNodes = workspaceTreeNodes();
+			const draggedLocation = findTreeNodeLocation(currentNodes, nextDragState.draggedNodeId, workspaceTreeAdapter);
+			const canPersistMove = isUuidString(activeProject()?.id ?? "");
+			const previewNodes = moveTreeNode(currentNodes, nextDragState.draggedNodeId, nextDragState.dropTarget as WorkspaceDragTarget, workspaceTreeAdapter);
+			const previewLocation = findTreeNodeLocation(previewNodes, nextDragState.draggedNodeId, workspaceTreeAdapter);
+			const persistedParentLocation = previewLocation?.parentId
+				? findTreeNodeLocation(previewNodes, previewLocation.parentId, workspaceTreeAdapter)
+				: null;
+			const previewSiblings = previewLocation?.parentId
+				? persistedParentLocation?.node.kind === "folder"
+					? persistedParentLocation.node.children ?? []
+					: []
+				: previewNodes;
+			const targetIndex = previewLocation
+				? countWorkspaceFolderSiblingsBeforeIndex(previewSiblings, previewLocation.index)
+				: 0;
+
+			if (
+				canPersistMove &&
+				draggedLocation?.node.kind === "folder" &&
+				(!previewLocation?.parentId || persistedParentLocation?.node.kind === "folder")
+			) {
+				void moveFolder(
+					draggedLocation.node.id,
+					persistedParentLocation?.node.kind === "folder" ? persistedParentLocation.node.id : null,
+					targetIndex,
+				);
+			} else if (
+				canPersistMove &&
+				draggedLocation?.node.kind === "item" &&
+				resolveItemPath(draggedLocation.node.id) &&
+				(!previewLocation?.parentId || persistedParentLocation?.node.kind === "folder")
+			) {
+				void moveItem(
+					draggedLocation.node.id,
+					persistedParentLocation?.node.kind === "folder" ? persistedParentLocation.node.id : null,
+					previewLocation?.index ?? 0,
+				);
+			} else {
+				setWorkspaceTreeNodes((current) =>
+					moveTreeNode(current, nextDragState.draggedNodeId, nextDragState.dropTarget as WorkspaceDragTarget, workspaceTreeAdapter),
+				);
+			}
+
+			setDragState(null);
+		};
+
+		const handleEscape = (event: KeyboardEvent): void => {
+			if (event.key !== "Escape") {
+				return;
+			}
+
+			clearLongPressTimer();
+
+			if (dragState()) {
+				setDragState(null);
+			}
+		};
+
+		window.addEventListener("pointerup", handlePointerUp);
+		window.addEventListener("pointercancel", handlePointerUp);
+		window.addEventListener("pointermove", handlePointerMove);
+		window.addEventListener("keydown", handleEscape);
+
+		onCleanup(() => {
+			clearLongPressTimer();
+			if (suppressClickTimer !== undefined) {
+				window.clearTimeout(suppressClickTimer);
+			}
+			window.removeEventListener("pointerup", handlePointerUp);
+			window.removeEventListener("pointercancel", handlePointerUp);
+			window.removeEventListener("pointermove", handlePointerMove);
+			window.removeEventListener("keydown", handleEscape);
+		});
+	});
+
+	const beginFolderDraft = (parentId: string | null, depth: number): void => {
+		if (parentId) {
+			setCollapsedFolderIds((current) => current.filter((id) => id !== parentId));
+		}
+
+		setPendingFolderRename(null);
+		setPendingFolderRenameName("");
+		setPendingFolderName("");
+		setPendingFolderDraft({ parentId, depth });
+	};
+
+	const beginFolderRename = (folderId: string, label: string, depth: number): void => {
+		setPendingFolderDraft(null);
+		setPendingFolderName("");
+		setPendingFolderRename({ folderId, depth });
+		setPendingFolderRenameName(label);
+	};
+
+	const submitPendingFolder = async (): Promise<void> => {
+		const name = pendingFolderName().trim();
+		const draft = pendingFolderDraft();
+		const projectId = activeProject()?.id ?? "";
+
+		if (!draft) {
+			return;
+		}
+
+		if (!name) {
+			setPendingFolderDraft(null);
+			setPendingFolderName("");
+			return;
+		}
+
+		if (!projectId || !isUuidString(projectId)) {
+			cancelPendingFolder();
+			return;
+		}
+
+		const parentFolderPath = draft.parentId ? resolveFolderPath(draft.parentId) : null;
+		if (draft.parentId && !parentFolderPath) {
+			cancelPendingFolder();
+			return;
+		}
+
+		const created = await createFolder(name, draft.parentId);
+		if (created) {
+			setPendingFolderDraft(null);
+			setPendingFolderName("");
+		}
+	};
+
+	const deletePersistedFolder = async (folderId: string): Promise<void> => {
+		const deleted = await deleteFolder(folderId);
+		if (deleted) {
+			setCollapsedFolderIds((current) => current.filter((id) => id !== folderId));
+		}
+	};
+
+	const submitPendingFolderRename = async (): Promise<void> => {
+		const draft = pendingFolderRename();
+		const name = pendingFolderRenameName().trim();
+		const projectId = activeProject()?.id ?? "";
+
+		if (!draft) {
+			return;
+		}
+
+		if (!name) {
+			setPendingFolderRename(null);
+			setPendingFolderRenameName("");
+			return;
+		}
+
+		if (!projectId || !isUuidString(projectId)) {
+			cancelPendingFolderRename();
+			return;
+		}
+
+		const folderPath = resolveFolderPath(draft.folderId);
+		if (!folderPath) {
+			cancelPendingFolderRename();
+			return;
+		}
+
+		const renamed = await renameFolder(draft.folderId, name);
+		if (renamed) {
+			setPendingFolderRename(null);
+			setPendingFolderRenameName("");
+		}
+	};
+
+	const cancelPendingFolder = (): void => {
+		setPendingFolderDraft(null);
+		setPendingFolderName("");
+	};
+
+	const cancelPendingFolderRename = (): void => {
+		setPendingFolderRename(null);
+		setPendingFolderRenameName("");
+	};
+
+	const handleHeaderActionClick = (actionId: string): void => {
+		switch (actionId) {
+			case "toggle-workspace-folders":
+				toggleAllFolders();
+				return;
+			case "search-workspace":
+			default:
+				return;
+		}
+	};
+
+	const openWorkspaceCreateMenu = (element: HTMLElement): void => {
+		contextMenu.openMenuFromElement(element, sidebarContextMenuTarget());
+	};
+
+	const resolveCreateItemType = (actionId: string): WorkspaceItemTypeId | null => {
+		switch (actionId) {
+			case "create-doc":
+				return "core.doc";
+			case "create-board":
+				return "core.board.kanban";
+			case "create-list-board":
+				return "core.board.list";
+			default:
+				return null;
+		}
+	};
+
+	const createPersistedItem = async (itemType: WorkspaceItemTypeId, parentId: string | null): Promise<void> => {
+		const definition = getWorkspaceItemTypeDefinition(itemType);
+		await createItem(definition.defaultCreateLabel, itemType, parentId);
+	};
+
+	const handleNodePointerDown = (event: PointerEvent, nodeId: string): void => {
+		if (event.button !== 0 || pendingFolderDraft()) {
+			return;
+		}
+
+		updateDragGhostPosition(event.clientX, event.clientY);
+		clearLongPressTimer();
+		longPressTimer = window.setTimeout(() => {
+			suppressTreeClickTemporarily();
+			setDragState({ draggedNodeId: nodeId, dropTarget: null });
+		}, LONG_PRESS_MS);
+	};
+
+	const handleNodePointerMove = (
+		event: PointerEvent,
+		parentId: string | null,
+		index: number,
+		node: WorkspaceTreeNode,
+	): void => {
+		const nextDragState = dragState();
+
+		if (!nextDragState || nextDragState.draggedNodeId === getWorkspaceTreeNodeId(node)) {
+			return;
+		}
+
+		const relativeY = getPointerRelativeY(event);
+		if (relativeY === null) {
+			return;
+		}
+
+		setDragState({
+			...nextDragState,
+			dropTarget: resolveTreeDropTarget({
+				parentId,
+				index,
+				node,
+				relativeY,
+				adapter: workspaceTreeAdapter,
+			}),
+		});
+	};
+
+	const handleContextActionSelect = (action: WorkspaceContextMenuAction, target: WorkspaceContextMenuTarget): void => {
+		const createItemType = resolveCreateItemType(action.id);
+		if (createItemType) {
+			switch (target.kind) {
+				case "workspace":
+				case "home":
+					void createPersistedItem(createItemType, null);
+					return;
+				case "folder":
+					void createPersistedItem(createItemType, target.id);
+					return;
+				case "settings":
+				case "item":
+					return;
+			}
+		}
+
+		switch (action.id) {
+			case "new-folder":
+				switch (target.kind) {
+					case "workspace":
+					case "home":
+						beginFolderDraft(null, 0);
+						return;
+					case "folder":
+						beginFolderDraft(target.id, (findTreeNodeDepth(workspaceTreeNodes(), target.id, workspaceTreeAdapter) ?? 0) + 1);
+						return;
+					case "settings":
+					case "item":
+						return;
+				}
+				return;
+			case "delete-folder":
+				if (target.kind === "folder") {
+					void deletePersistedFolder(target.id);
+				}
+				return;
+			case "rename-folder":
+				if (target.kind === "folder") {
+					beginFolderRename(target.id, target.label, findTreeNodeDepth(workspaceTreeNodes(), target.id, workspaceTreeAdapter) ?? 0);
+				}
+				return;
+			case "delete-doc":
+			case "delete-board":
+			case "delete-list-board":
+				if (target.kind === "item") {
+					void deleteItem(target.id);
+				}
+				return;
+			default:
+				return;
+		}
+	};
+
+	return {
+		activeProject,
+		contextMenu,
+		sidebarContextMenuTarget,
+		isProjectDrawerOpen,
+		setIsProjectDrawerOpen,
+		workspaceTreeNodes,
+		isFolderCollapsed,
+		pendingFolderDraft,
+		pendingFolderName,
+		setPendingFolderName,
+		submitPendingFolder,
+		cancelPendingFolder,
+		pendingFolderRename,
+		pendingFolderRenameName,
+		setPendingFolderRenameName,
+		submitPendingFolderRename,
+		cancelPendingFolderRename,
+		handleNodePointerDown,
+		handleNodePointerMove,
+		dragState,
+		suppressNextTreeClick,
+		draggedNode,
+		dragGhostPosition,
+		draggedNodeMeta,
+		workspaceFolderToggleLabel,
+		areAllFoldersCollapsed,
+		totalFolderCount,
+		handleHeaderActionClick,
+		openWorkspaceCreateMenu,
+		handleContextActionSelect,
+		toggleFolder,
+	};
+};

Frontend/src/components/workspace-navigation/WorkspaceSidebar/WorkspaceSidebar.parts.tsx

@@ -0,0 +1,287 @@
+// Path: Frontend/src/components/workspace-navigation/WorkspaceSidebar/WorkspaceSidebar.parts.tsx
+
+import { For, Show, type JSX } from "solid-js";
+import { ChevronRight, Folder } from "../../../lib/icons";
+import {
+	createWorkspaceStaticTarget,
+	createWorkspaceTreeTarget,
+	getWorkspaceNodeIcon,
+	type WorkspaceContextMenuTarget,
+	type WorkspaceStaticItem,
+	type WorkspaceTreeNode,
+} from "../../app-shell/data/shell.data";
+import {
+	isContextMenuKeyboardTrigger,
+	type PendingWorkspaceFolderDraft,
+	type PendingWorkspaceFolderRename,
+	type WorkspaceDragState,
+	type WorkspaceDragTarget,
+} from "./WorkspaceSidebar.data";
+import styles from "./WorkspaceSidebar.module.scss";
+
+export const FolderDraftRow = (props: {
+	depth: number;
+	value: string;
+	onInput: (value: string) => void;
+	onSubmit: () => void;
+	onCancel: () => void;
+}): JSX.Element => {
+	let inputRef: HTMLInputElement | undefined;
+
+	queueMicrotask(() => inputRef?.focus());
+
+	return (
+		<li>
+			<div class={styles.treeInputRow} style={{ "--tree-depth": String(props.depth) }}>
+				<Folder class={styles.icon} size={18} strokeWidth={2} />
+				<input
+					ref={inputRef}
+					type="text"
+					class={styles.treeInput}
+					value={props.value}
+					placeholder="Folder name"
+					onInput={(event): void => props.onInput(event.currentTarget.value)}
+					onBlur={props.onSubmit}
+					onKeyDown={(event): void => {
+						if (event.key === "Enter") {
+							event.preventDefault();
+							event.currentTarget.blur();
+							return;
+						}
+
+						if (event.key === "Escape") {
+							event.preventDefault();
+							props.onCancel();
+							event.currentTarget.blur();
+						}
+					}}
+				/>
+			</div>
+		</li>
+	);
+};
+
+export const WorkspaceHomeEntry = (props: {
+	item: WorkspaceStaticItem;
+	onOpenContextMenu: (event: MouseEvent, target: WorkspaceContextMenuTarget) => void;
+	onOpenContextMenuFromKeyboard: (element: HTMLElement, target: WorkspaceContextMenuTarget) => void;
+}): JSX.Element => {
+	const Icon = props.item.icon;
+	const target = createWorkspaceStaticTarget(props.item);
+
+	return (
+		<li>
+			<button
+				type="button"
+				classList={{
+					[styles.navItem]: true,
+					[styles.navItemActive]: !!props.item.active,
+				}}
+				aria-current={props.item.active ? "page" : undefined}
+				aria-label={props.item.label}
+				title={props.item.label}
+				data-slot="workspace-static-item"
+				data-target-kind={target.kind}
+				data-active={props.item.active ? "true" : "false"}
+				onContextMenu={(event): void => {
+					event.stopPropagation();
+					props.onOpenContextMenu(event, target);
+				}}
+				onKeyDown={(event): void => {
+					if (!isContextMenuKeyboardTrigger(event)) {
+						return;
+					}
+
+					event.preventDefault();
+					props.onOpenContextMenuFromKeyboard(event.currentTarget, target);
+				}}
+			>
+				<Icon class={styles.icon} size={18} strokeWidth={2} />
+				<span class={styles.label}>{props.item.label}</span>
+				<Show when={props.item.meta}>
+					<span class={styles.itemMeta}>{props.item.meta}</span>
+				</Show>
+			</button>
+		</li>
+	);
+};
+
+export const WorkspaceTreeBranch = (props: {
+	nodes: readonly WorkspaceTreeNode[];
+	parentId?: string | null;
+	depth?: number;
+	isFolderCollapsed: (folderId: string) => boolean;
+	onToggleFolder: (folderId: string) => void;
+	pendingFolderDraft: PendingWorkspaceFolderDraft | null;
+	pendingFolderName: string;
+	onPendingFolderNameChange: (value: string) => void;
+	onSubmitPendingFolder: () => void;
+	onCancelPendingFolder: () => void;
+	pendingFolderRename: PendingWorkspaceFolderRename | null;
+	pendingFolderRenameName: string;
+	onPendingFolderRenameChange: (value: string) => void;
+	onSubmitPendingFolderRename: () => void;
+	onCancelPendingFolderRename: () => void;
+	onOpenContextMenu: (event: MouseEvent, target: WorkspaceContextMenuTarget) => void;
+	onOpenContextMenuFromKeyboard: (element: HTMLElement, target: WorkspaceContextMenuTarget) => void;
+	onNodePointerDown: (event: PointerEvent, nodeId: string) => void;
+	onNodePointerMove: (event: PointerEvent, parentId: string | null, index: number, node: WorkspaceTreeNode) => void;
+	dragState: WorkspaceDragState | null;
+	isTreeClickSuppressed: () => boolean;
+}): JSX.Element => {
+	const depth = () => props.depth ?? 0;
+	const parentId = () => props.parentId ?? null;
+
+	return (
+		<ul class={styles.treeList} role="list">
+			<Show when={props.nodes.length === 0 && props.pendingFolderDraft?.parentId !== parentId()}>
+				<li>
+					<div class={styles.treeEmptySlot} style={{ "--tree-depth": String(depth()) }} />
+				</li>
+			</Show>
+			<For each={props.nodes}>
+				{(node, indexAccessor): JSX.Element => {
+					const Icon = getWorkspaceNodeIcon(node);
+					const target = createWorkspaceTreeTarget(node);
+					const isCollapsed = (): boolean => (node.kind === "folder" ? props.isFolderCollapsed(node.id) : false);
+					const isRenaming = (): boolean => props.pendingFolderRename?.folderId === node.id;
+					const isDraggedNode = (): boolean => props.dragState?.draggedNodeId === node.id;
+					const dropIntent = (): WorkspaceDragTarget["intent"] | null => {
+						if (props.dragState?.dropTarget?.targetNodeId !== node.id) {
+							return null;
+						}
+
+						return props.dragState.dropTarget.intent;
+					};
+
+					return (
+						<li>
+							<Show
+								when={node.kind === "folder" && isRenaming()}
+								fallback={
+									<button
+										type="button"
+										classList={{
+											[styles.treeItem]: true,
+											[styles.treeItemActive]: !!node.active,
+											[styles.treeItemFolder]: node.kind === "folder",
+											[styles.treeItemDragging]: isDraggedNode(),
+											[styles.treeItemDropBefore]: dropIntent() === "before",
+											[styles.treeItemDropAfter]: dropIntent() === "after",
+											[styles.treeItemDropInside]: dropIntent() === "inside",
+										}}
+										style={{ "--tree-depth": String(depth()) }}
+										aria-expanded={node.kind === "folder" ? !isCollapsed() : undefined}
+										aria-current={node.active ? "page" : undefined}
+										aria-label={node.label}
+										title={node.label}
+										data-slot="workspace-tree-item"
+										data-kind={node.kind}
+										data-item-type={node.kind === "item" ? node.itemType : undefined}
+										data-active={node.active ? "true" : "false"}
+										onClick={(): void => {
+											if (props.dragState || props.isTreeClickSuppressed()) {
+												return;
+											}
+
+											if (node.kind !== "folder") {
+												return;
+											}
+
+											props.onToggleFolder(node.id);
+										}}
+										onContextMenu={(event): void => {
+											event.stopPropagation();
+											props.onOpenContextMenu(event, target);
+										}}
+										onPointerDown={(event): void => props.onNodePointerDown(event, node.id)}
+										onPointerMove={(event): void =>
+											props.onNodePointerMove(event, parentId(), indexAccessor(), node)
+										}
+										onPointerEnter={(event): void =>
+											props.onNodePointerMove(event, parentId(), indexAccessor(), node)
+										}
+										onKeyDown={(event): void => {
+											if (!isContextMenuKeyboardTrigger(event)) {
+												return;
+											}
+
+											event.preventDefault();
+											props.onOpenContextMenuFromKeyboard(event.currentTarget, target);
+										}}
+									>
+										<Show when={node.kind === "folder"}>
+											<ChevronRight
+												classList={{
+													[styles.folderChevron]: true,
+													[styles.folderChevronOpen]: !isCollapsed(),
+												}}
+												size={16}
+												strokeWidth={2}
+											/>
+										</Show>
+										<Icon class={styles.icon} size={18} strokeWidth={2} />
+										<span class={styles.label}>{node.label}</span>
+										<Show when={node.meta}>
+											<span class={styles.itemMeta}>{node.meta}</span>
+										</Show>
+									</button>
+								}
+							>
+								<FolderDraftRow
+									depth={props.pendingFolderRename?.depth ?? depth()}
+									value={props.pendingFolderRenameName}
+									onInput={props.onPendingFolderRenameChange}
+									onSubmit={props.onSubmitPendingFolderRename}
+									onCancel={props.onCancelPendingFolderRename}
+								/>
+							</Show>
+
+							<Show
+								when={
+									node.kind === "folder" &&
+									!isCollapsed() &&
+									(((node.children?.length ?? 0) > 0) || props.pendingFolderDraft?.parentId === node.id)
+								}
+							>
+								<WorkspaceTreeBranch
+									nodes={node.children ?? []}
+									parentId={node.id}
+									depth={depth() + 1}
+									isFolderCollapsed={props.isFolderCollapsed}
+									onToggleFolder={props.onToggleFolder}
+									pendingFolderDraft={props.pendingFolderDraft}
+									pendingFolderName={props.pendingFolderName}
+									onPendingFolderNameChange={props.onPendingFolderNameChange}
+									onSubmitPendingFolder={props.onSubmitPendingFolder}
+									onCancelPendingFolder={props.onCancelPendingFolder}
+									pendingFolderRename={props.pendingFolderRename}
+									pendingFolderRenameName={props.pendingFolderRenameName}
+									onPendingFolderRenameChange={props.onPendingFolderRenameChange}
+									onSubmitPendingFolderRename={props.onSubmitPendingFolderRename}
+									onCancelPendingFolderRename={props.onCancelPendingFolderRename}
+									onOpenContextMenu={props.onOpenContextMenu}
+									onOpenContextMenuFromKeyboard={props.onOpenContextMenuFromKeyboard}
+									onNodePointerDown={props.onNodePointerDown}
+									onNodePointerMove={props.onNodePointerMove}
+									dragState={props.dragState}
+									isTreeClickSuppressed={props.isTreeClickSuppressed}
+								/>
+							</Show>
+						</li>
+					);
+				}}
+			</For>
+
+			<Show when={props.pendingFolderDraft && props.pendingFolderDraft.parentId === parentId()}>
+				<FolderDraftRow
+					depth={props.pendingFolderDraft?.depth ?? depth()}
+					value={props.pendingFolderName}
+					onInput={props.onPendingFolderNameChange}
+					onSubmit={props.onSubmitPendingFolder}
+					onCancel={props.onCancelPendingFolder}
+				/>
+			</Show>
+		</ul>
+	);
+};

Frontend/src/components/workspace-navigation/WorkspaceSidebar/WorkspaceSidebar.tsx

@@ -0,0 +1,250 @@
+// Path: Frontend/src/components/workspace-navigation/WorkspaceSidebar/WorkspaceSidebar.tsx
+
+import { For, Show, type JSX } from "solid-js";
+import { Portal } from "solid-js/web";
+import { ChevronLeft, ChevronRight, ListCollapse, Plus, UnfoldVertical } from "../../../lib/icons";
+import { ProjectSelector } from "../ProjectSelector/ProjectSelector";
+import {
+	getWorkspaceNodeIcon,
+	workspaceSidebarHeaderActions,
+	workspaceStaticItems,
+} from "../../app-shell/data/shell.data";
+import { WorkspaceContextMenu } from "../WorkspaceContextMenu/WorkspaceContextMenu";
+import type { WorkspaceSidebarProps } from "./WorkspaceSidebar.data";
+import { useWorkspaceSidebar } from "./WorkspaceSidebar.hook";
+import { WorkspaceHomeEntry, WorkspaceTreeBranch } from "./WorkspaceSidebar.parts";
+import styles from "./WorkspaceSidebar.module.scss";
+
+export const WorkspaceSidebar = (props: WorkspaceSidebarProps): JSX.Element => {
+	const railToggleLabel = (): string => (props.railCollapsed ? "Expand server rail" : "Collapse server rail");
+	const {
+		contextMenu,
+		sidebarContextMenuTarget,
+		isProjectDrawerOpen,
+		setIsProjectDrawerOpen,
+		workspaceTreeNodes,
+		isFolderCollapsed,
+		pendingFolderDraft,
+		pendingFolderName,
+		setPendingFolderName,
+		submitPendingFolder,
+		cancelPendingFolder,
+		pendingFolderRename,
+		pendingFolderRenameName,
+		setPendingFolderRenameName,
+		submitPendingFolderRename,
+		cancelPendingFolderRename,
+		handleNodePointerDown,
+		handleNodePointerMove,
+		dragState,
+		suppressNextTreeClick,
+		draggedNode,
+		dragGhostPosition,
+		draggedNodeMeta,
+		workspaceFolderToggleLabel,
+		areAllFoldersCollapsed,
+		totalFolderCount,
+		handleHeaderActionClick,
+		openWorkspaceCreateMenu,
+		handleContextActionSelect,
+		toggleFolder,
+	} = useWorkspaceSidebar();
+
+	return (
+		<>
+			<aside
+				classList={{
+					[styles.sidebar]: true,
+					[styles.sidebarCollapsed]: props.collapsed,
+					[styles.sidebarDragMode]: !!dragState(),
+				}}
+				aria-label="Left workspace sidebar"
+				data-ui="workspace-sidebar"
+				data-collapsed={props.collapsed ? "true" : "false"}
+				onContextMenu={(event): void => {
+					contextMenu.openMenu(event, sidebarContextMenuTarget());
+				}}
+			>
+				<div
+					classList={{
+						[styles.header]: true,
+						[styles.headerDrawerOpen]: isProjectDrawerOpen(),
+					}}
+					data-slot="workspace-sidebar-header"
+					data-drawer-open={isProjectDrawerOpen() ? "true" : "false"}
+				>
+					<div class={styles.headerActions} data-slot="workspace-sidebar-header-actions">
+						<button
+							type="button"
+							classList={{
+								[styles.headerActionButton]: true,
+								[styles.headerCollapseButton]: true,
+							}}
+							aria-label={railToggleLabel()}
+							title={railToggleLabel()}
+							data-slot="workspace-sidebar-rail-toggle"
+							onClick={props.onToggleRailCollapse}
+						>
+							{props.railCollapsed ? <ChevronRight size={16} strokeWidth={2} /> : <ChevronLeft size={16} strokeWidth={2} />}
+						</button>
+
+					<For each={workspaceSidebarHeaderActions}>
+						{(action): JSX.Element => {
+							const label =
+								action.id === "toggle-workspace-folders"
+										? workspaceFolderToggleLabel()
+										: action.label;
+							const Icon =
+								action.id === "toggle-workspace-folders"
+										? areAllFoldersCollapsed()
+											? UnfoldVertical
+											: ListCollapse
+										: action.icon;
+
+							return (
+								<button
+									type="button"
+									class={styles.headerActionButton}
+									aria-label={label}
+									title={label}
+									data-slot="workspace-sidebar-header-action"
+									data-action-id={action.id}
+									disabled={action.id === "toggle-workspace-folders" && totalFolderCount() === 0}
+									onClick={(): void => handleHeaderActionClick(action.id)}
+									>
+										<Icon size={16} strokeWidth={2} />
+									</button>
+								);
+							}}
+						</For>
+					</div>
+
+					<div class={styles.headerControls} data-slot="workspace-sidebar-header-controls">
+						<ProjectSelector
+							compact={props.collapsed}
+							isOpen={isProjectDrawerOpen()}
+							onToggle={(): void => {
+								setIsProjectDrawerOpen(true);
+							}}
+							onClose={(): void => {
+								setIsProjectDrawerOpen(false);
+							}}
+						/>
+					</div>
+				</div>
+
+				<div
+					classList={{
+						[styles.section]: true,
+						[styles.sectionHidden]: isProjectDrawerOpen(),
+					}}
+					data-slot="workspace-sidebar-section"
+				>
+					<Show when={!props.collapsed}>
+						<span class={styles.sectionLabel}>Workspace</span>
+					</Show>
+					<div class={styles.navScroller} data-slot="workspace-sidebar-nav-scroller">
+						<ul class={styles.navList} role="list" data-slot="workspace-static-list">
+							<For each={workspaceStaticItems}>
+								{(item): JSX.Element => (
+									<WorkspaceHomeEntry
+										item={item}
+										onOpenContextMenu={contextMenu.openMenu}
+										onOpenContextMenuFromKeyboard={contextMenu.openMenuFromElement}
+									/>
+								)}
+							</For>
+						</ul>
+
+						<Show when={!props.collapsed}>
+							<div class={styles.treeSectionHeader}>
+								<div class={styles.treeSectionLabel}>Items</div>
+								<div class={styles.treeControls}>
+									<button
+										type="button"
+										class={styles.treeControlButton}
+										onClick={(event): void => {
+											event.stopPropagation();
+											openWorkspaceCreateMenu(event.currentTarget);
+										}}
+										aria-label="Create in Items"
+										title="Create"
+									>
+										<Plus size={16} strokeWidth={2.25} />
+									</button>
+								</div>
+							</div>
+						</Show>
+
+						<div data-slot="workspace-tree-root">
+							<WorkspaceTreeBranch
+								nodes={workspaceTreeNodes()}
+								parentId={null}
+								isFolderCollapsed={isFolderCollapsed}
+								onToggleFolder={toggleFolder}
+								pendingFolderDraft={pendingFolderDraft()}
+								pendingFolderName={pendingFolderName()}
+								onPendingFolderNameChange={setPendingFolderName}
+								onSubmitPendingFolder={submitPendingFolder}
+								onCancelPendingFolder={cancelPendingFolder}
+								pendingFolderRename={pendingFolderRename()}
+								pendingFolderRenameName={pendingFolderRenameName()}
+								onPendingFolderRenameChange={setPendingFolderRenameName}
+								onSubmitPendingFolderRename={submitPendingFolderRename}
+								onCancelPendingFolderRename={cancelPendingFolderRename}
+								onOpenContextMenu={contextMenu.openMenu}
+								onOpenContextMenuFromKeyboard={contextMenu.openMenuFromElement}
+								onNodePointerDown={handleNodePointerDown}
+								onNodePointerMove={handleNodePointerMove}
+								dragState={dragState()}
+								isTreeClickSuppressed={suppressNextTreeClick}
+							/>
+						</div>
+					</div>
+				</div>
+			</aside>
+
+			<WorkspaceContextMenu
+				target={contextMenu.menuState()?.target ?? null}
+				position={(() => {
+					const state = contextMenu.menuState();
+					return state
+						? {
+							x: state.x,
+							y: state.y,
+						}
+						: null;
+				})()}
+				menuRef={contextMenu.setMenuRef}
+				onClose={contextMenu.closeMenu}
+				onSelect={handleContextActionSelect}
+			/>
+
+			<Show when={draggedNode()} keyed>
+				{(node): JSX.Element => {
+					const GhostIcon = getWorkspaceNodeIcon(node);
+
+					return (
+						<Portal>
+							<div class={styles.dragGhostLayer} aria-hidden="true">
+								<div
+									class={styles.dragGhost}
+									style={{
+										"--drag-ghost-x": `${dragGhostPosition().x}px`,
+										"--drag-ghost-y": `${dragGhostPosition().y}px`,
+									}}
+								>
+									<GhostIcon class={styles.icon} size={18} strokeWidth={2} />
+									<div class={styles.dragGhostCopy}>
+										<div class={styles.dragGhostTitle}>{node.label}</div>
+										<div class={styles.dragGhostMeta}>{draggedNodeMeta()}</div>
+									</div>
+								</div>
+							</div>
+						</Portal>
+					);
+				}}
+			</Show>
+		</>
+	);
+};

Frontend/src/components/workspace-navigation/WorkspaceTopBar/WorkspaceTopBar.module.scss

@@ -0,0 +1,81 @@
+.workspaceTopBar {
+  width: 100%;
+  display: grid;
+  grid-template-columns: auto minmax(0, 1fr) auto;
+  align-items: center;
+  gap: var(--space-2);
+  min-height: calc(var(--control-size-md) - var(--space-3));
+  padding: var(--space-5) var(--space-6) 0;
+}
+
+.workspaceTopBarStart,
+.workspaceTopBarEnd {
+  min-width: calc(var(--control-size-md) - 0.5rem);
+  display: inline-flex;
+  align-items: center;
+}
+
+.workspaceTopBarEnd {
+  justify-content: flex-end;
+}
+
+.workspaceTopBarCenter {
+  min-width: 0;
+  display: flex;
+  justify-content: center;
+}
+
+.workspaceBreadcrumb {
+  @include text-caption;
+  min-width: 0;
+  color: var(--color-text-muted);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.workspaceCollapseButton {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: calc(var(--control-size-md) - 0.5rem);
+  height: calc(var(--control-size-md) - 0.5rem);
+  border: 1px solid color-mix(in srgb, var(--color-border-strong) 44%, transparent);
+  border-radius: var(--radius-pill);
+  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
+  color: var(--color-text-muted);
+  box-shadow: var(--shadow-soft);
+  transition:
+    background 160ms var(--easing-standard),
+    color 160ms var(--easing-standard),
+    border-color 160ms var(--easing-standard),
+    transform 180ms var(--easing-standard);
+}
+
+.workspaceCollapseButton:hover,
+.workspaceCollapseButton:focus-visible {
+  background: var(--color-surface-hover);
+  border-color: var(--color-border);
+  color: var(--color-text);
+}
+
+.workspaceCollapseButton:hover {
+  transform: translateY(-1px);
+}
+
+@include respond-down(mobile) {
+  .workspaceTopBar {
+    grid-template-columns: minmax(0, 1fr);
+    padding: var(--space-4) var(--space-4) 0;
+  }
+
+  .workspaceTopBarStart,
+  .workspaceTopBarEnd,
+  .workspaceCollapseButton {
+    display: none;
+  }
+
+  .workspaceTopBarCenter {
+    justify-content: flex-start;
+  }
+}

Frontend/src/components/workspace-navigation/WorkspaceTopBar/WorkspaceTopBar.tsx

@@ -0,0 +1,29 @@
+import { type JSX } from "solid-js";
+import { ChevronLeft, ChevronRight } from "../../../lib/icons";
+import styles from "./WorkspaceTopBar.module.scss";
+
+type WorkspaceTopBarProps = {
+	sidebarCollapsed: boolean;
+	breadcrumb: string;
+	onToggleSidebarCollapse: () => void;
+};
+
+export const WorkspaceTopBar = (props: WorkspaceTopBarProps): JSX.Element => {
+	const sidebarToggleLabel = (): string => (props.sidebarCollapsed ? "Expand left workspace sidebar" : "Collapse left workspace sidebar");
+
+	return (
+		<div class={styles.workspaceTopBar} data-slot="workspace-top-bar">
+			<div class={styles.workspaceTopBarStart} data-slot="workspace-top-bar-start">
+				<button type="button" class={styles.workspaceCollapseButton} aria-label={sidebarToggleLabel()} title={sidebarToggleLabel()} data-slot="workspace-sidebar-toggle" onClick={props.onToggleSidebarCollapse}>
+					{props.sidebarCollapsed ? <ChevronRight size={16} strokeWidth={2} /> : <ChevronLeft size={16} strokeWidth={2} />}
+				</button>
+			</div>
+
+			<div class={styles.workspaceTopBarCenter} data-slot="workspace-top-bar-center">
+				<span class={styles.workspaceBreadcrumb}>{props.breadcrumb}</span>
+			</div>
+
+			<div class={styles.workspaceTopBarEnd} data-slot="workspace-top-bar-end" aria-hidden="true" />
+		</div>
+	);
+};

Frontend/src/components/workspace-navigation/shared/useWorkspaceTreeData.ts

@@ -0,0 +1,263 @@
+import { createEffect, createSignal, type Accessor, type Setter } from "solid-js";
+import type { WorkspaceItemTypeId, WorkspaceTreeNode } from "../../app-shell/data/shell.data";
+import {
+	buildPersistedWorkspaceTreeNodes,
+	findWorkspaceTreeNodeById,
+	readPersistedWorkspaceTreeNodes,
+} from "./workspaceTree.adapters";
+import {
+	createWorkspaceFolderRequest,
+	createWorkspaceItemRequest,
+	deleteWorkspaceFolderRequest,
+	deleteWorkspaceItemRequest,
+	fetchWorkspaceTree,
+	isValidWorkspaceProjectId,
+	moveWorkspaceFolderRequest,
+	moveWorkspaceItemRequest,
+	readWorkspaceMutationResponse,
+	renameWorkspaceFolderRequest,
+} from "./workspaceTree.api";
+import type {
+	PersistedWorkspaceTreeNodeRecord,
+	UseWorkspaceTreeDataOptions,
+	UseWorkspaceTreeDataResult,
+} from "./workspaceTree.types";
+
+export const useWorkspaceTreeData = (
+	options: UseWorkspaceTreeDataOptions,
+): UseWorkspaceTreeDataResult => {
+	const [persistedNodes, setPersistedNodes] = createSignal<readonly PersistedWorkspaceTreeNodeRecord[]>([]);
+	const [workspaceTreeNodes, setWorkspaceTreeNodes] = createSignal<readonly WorkspaceTreeNode[]>(
+		options.fallbackWorkspaceTree(),
+	);
+	let latestPersistedTreeRequest = 0;
+
+	const syncWorkspaceTree = (): void => {
+		const nextTree = options.activeProjectId()
+			? buildPersistedWorkspaceTreeNodes(persistedNodes())
+			: options.fallbackWorkspaceTree();
+
+		setWorkspaceTreeNodes(nextTree);
+	};
+
+	const loadPersistedTree = async (projectId: string): Promise<boolean> => {
+		const requestId = latestPersistedTreeRequest + 1;
+		latestPersistedTreeRequest = requestId;
+
+		if (!isValidWorkspaceProjectId(projectId)) {
+			setPersistedNodes([]);
+			return false;
+		}
+
+		try {
+			const body = await fetchWorkspaceTree(projectId);
+
+			if (requestId !== latestPersistedTreeRequest) {
+				return false;
+			}
+
+			if (body.error) {
+				throw new Error(body.message || "Failed to load project tree.");
+			}
+
+			setPersistedNodes(readPersistedWorkspaceTreeNodes(body));
+			return true;
+		} catch (error) {
+			if (requestId !== latestPersistedTreeRequest) {
+				return false;
+			}
+
+			console.error(error);
+			setPersistedNodes([]);
+			return false;
+		}
+	};
+
+	const resolveFolderPath = (folderId: string): string | null => {
+		const node = findWorkspaceTreeNodeById(workspaceTreeNodes(), folderId);
+		return node?.kind === "folder" ? node.path ?? null : null;
+	};
+
+	const resolveItemPath = (itemId: string): string | null => {
+		const node = findWorkspaceTreeNodeById(workspaceTreeNodes(), itemId);
+		return node?.kind === "item" ? node.path ?? null : null;
+	};
+
+	const refreshAfterMutation = async (projectId: string, response: Response): Promise<boolean> => {
+		const body = await readWorkspaceMutationResponse(response);
+		if (!response.ok) {
+			throw new Error(body.message || "Failed to persist project tree mutation.");
+		}
+
+		return loadPersistedTree(projectId);
+	};
+
+	const createFolder = async (name: string, parentId: string | null): Promise<boolean> => {
+		const projectId = options.activeProjectId();
+		if (!isValidWorkspaceProjectId(projectId)) {
+			return false;
+		}
+
+		const parentFolderPath = parentId ? resolveFolderPath(parentId) : null;
+		if (parentId && !parentFolderPath) {
+			return false;
+		}
+
+		try {
+			const response = await createWorkspaceFolderRequest(projectId, name, parentFolderPath);
+
+			return refreshAfterMutation(projectId, response);
+		} catch (error) {
+			console.error(error);
+			return false;
+		}
+	};
+
+	const renameFolder = async (folderId: string, name: string): Promise<boolean> => {
+		const projectId = options.activeProjectId();
+		const folderPath = resolveFolderPath(folderId);
+		if (!isValidWorkspaceProjectId(projectId) || !folderPath) {
+			return false;
+		}
+
+		try {
+			const response = await renameWorkspaceFolderRequest(projectId, folderPath, name);
+
+			return refreshAfterMutation(projectId, response);
+		} catch (error) {
+			console.error(error);
+			return false;
+		}
+	};
+
+	const deleteFolder = async (folderId: string): Promise<boolean> => {
+		const projectId = options.activeProjectId();
+		const folderPath = resolveFolderPath(folderId);
+		if (!isValidWorkspaceProjectId(projectId) || !folderPath) {
+			return false;
+		}
+
+		try {
+			const response = await deleteWorkspaceFolderRequest(projectId, folderPath);
+
+			return refreshAfterMutation(projectId, response);
+		} catch (error) {
+			console.error(error);
+			return false;
+		}
+	};
+
+	const moveFolder = async (folderId: string, parentId: string | null, targetIndex: number): Promise<boolean> => {
+		const projectId = options.activeProjectId();
+		const folderPath = resolveFolderPath(folderId);
+		const parentFolderPath = parentId ? resolveFolderPath(parentId) : null;
+		if (!isValidWorkspaceProjectId(projectId) || !folderPath) {
+			return false;
+		}
+
+		try {
+			const response = await moveWorkspaceFolderRequest(
+				projectId,
+				folderPath,
+				folderId,
+				parentFolderPath,
+				parentId,
+				targetIndex,
+			);
+
+			return refreshAfterMutation(projectId, response);
+		} catch (error) {
+			console.error(error);
+			return false;
+		}
+	};
+
+	const createItem = async (
+		name: string,
+		itemType: WorkspaceItemTypeId,
+		parentId: string | null,
+	): Promise<boolean> => {
+		const projectId = options.activeProjectId();
+		if (!isValidWorkspaceProjectId(projectId)) {
+			return false;
+		}
+
+		const parentFolderPath = parentId ? resolveFolderPath(parentId) : null;
+		if (parentId && !parentFolderPath) {
+			return false;
+		}
+
+		try {
+			const response = await createWorkspaceItemRequest(projectId, name, itemType, parentFolderPath);
+
+			return refreshAfterMutation(projectId, response);
+		} catch (error) {
+			console.error(error);
+			return false;
+		}
+	};
+
+	const deleteItem = async (itemId: string): Promise<boolean> => {
+		const projectId = options.activeProjectId();
+		const itemPath = resolveItemPath(itemId);
+		if (!isValidWorkspaceProjectId(projectId) || !itemPath) {
+			return false;
+		}
+
+		try {
+			const response = await deleteWorkspaceItemRequest(projectId, itemPath);
+
+			return refreshAfterMutation(projectId, response);
+		} catch (error) {
+			console.error(error);
+			return false;
+		}
+	};
+
+	const moveItem = async (itemId: string, parentId: string | null, targetIndex: number): Promise<boolean> => {
+		const projectId = options.activeProjectId();
+		const itemPath = resolveItemPath(itemId);
+		const parentFolderPath = parentId ? resolveFolderPath(parentId) : null;
+		if (!isValidWorkspaceProjectId(projectId) || !itemPath) {
+			return false;
+		}
+
+		try {
+			const response = await moveWorkspaceItemRequest(
+				projectId,
+				itemPath,
+				itemId,
+				parentFolderPath,
+				parentId,
+				targetIndex,
+			);
+
+			return refreshAfterMutation(projectId, response);
+		} catch (error) {
+			console.error(error);
+			return false;
+		}
+	};
+
+	createEffect(() => {
+		syncWorkspaceTree();
+	});
+
+	createEffect(() => {
+		void loadPersistedTree(options.activeProjectId());
+	});
+
+	return {
+		workspaceTreeNodes,
+		setWorkspaceTreeNodes,
+		resolveFolderPath,
+		resolveItemPath,
+		createFolder,
+		renameFolder,
+		deleteFolder,
+		moveFolder,
+		createItem,
+		deleteItem,
+		moveItem,
+	};
+};

Frontend/src/components/workspace-navigation/shared/workspaceTree.adapters.ts

@@ -0,0 +1,50 @@
+import { Folder } from "../../../lib/icons";
+import type { WorkspaceTreeNode } from "../../app-shell/data/shell.data";
+import type { PersistedWorkspaceTreeNodeRecord, WorkspaceTreeResponse } from "./workspaceTree.types";
+
+export const buildPersistedWorkspaceTreeNodes = (
+	nodes: readonly PersistedWorkspaceTreeNodeRecord[],
+): WorkspaceTreeNode[] =>
+	nodes.map((node) =>
+		node.kind === "folder"
+			? {
+				id: node.id,
+				path: node.path,
+				label: node.label,
+				kind: "folder",
+				icon: Folder,
+				children: buildPersistedWorkspaceTreeNodes(node.children ?? []),
+			}
+			: {
+				id: node.id,
+				path: node.path,
+				label: node.label,
+				kind: "item",
+				itemType: node.itemType ?? "core.board.kanban",
+			}
+	);
+
+export const readPersistedWorkspaceTreeNodes = (body: WorkspaceTreeResponse): PersistedWorkspaceTreeNodeRecord[] =>
+	Array.isArray(body.data?.nodes) ? body.data.nodes : [];
+
+export const findWorkspaceTreeNodeById = (
+	nodes: readonly WorkspaceTreeNode[],
+	nodeId: string,
+): WorkspaceTreeNode | null => {
+	for (const node of nodes) {
+		if (node.id === nodeId) {
+			return node;
+		}
+
+		if (node.kind !== "folder") {
+			continue;
+		}
+
+		const nestedMatch = findWorkspaceTreeNodeById(node.children ?? [], nodeId);
+		if (nestedMatch) {
+			return nestedMatch;
+		}
+	}
+
+	return null;
+};

Frontend/src/components/workspace-navigation/shared/workspaceTree.api.ts

@@ -0,0 +1,129 @@
+import { resolveAPIBase } from "../../../lib/api";
+import { isUuidString } from "./navTreeDnd";
+import type { WorkspaceItemTypeId } from "../../app-shell/data/shell.data";
+import type { WorkspaceMutationResponse, WorkspaceTreeResponse } from "./workspaceTree.types";
+
+export const isValidWorkspaceProjectId = (projectId: string): boolean => Boolean(projectId) && isUuidString(projectId);
+
+const requestWorkspaceTree = async (path: string, init?: RequestInit): Promise<Response> =>
+	fetch(`${resolveAPIBase()}${path}`, init);
+
+export const fetchWorkspaceTree = async (projectId: string): Promise<WorkspaceTreeResponse> => {
+	const response = await requestWorkspaceTree(`/projects/${projectId}/tree`, {
+		headers: {
+			Accept: "application/json",
+		},
+	});
+
+	return (await response.json()) as WorkspaceTreeResponse;
+};
+
+export const readWorkspaceMutationResponse = async (response: Response): Promise<WorkspaceMutationResponse> =>
+	(await response.json()) as WorkspaceMutationResponse;
+
+export const createWorkspaceFolderRequest = (projectId: string, name: string, parentFolderId: string | null): Promise<Response> =>
+	requestWorkspaceTree(`/projects/${projectId}/tree/folders`, {
+		method: "POST",
+		headers: {
+			Accept: "application/json",
+			"Content-Type": "application/json",
+		},
+		body: JSON.stringify({
+			name,
+			parentFolderId,
+		}),
+	});
+
+export const renameWorkspaceFolderRequest = (projectId: string, folderId: string, name: string): Promise<Response> =>
+	requestWorkspaceTree(`/projects/${projectId}/tree/folders`, {
+		method: "PATCH",
+		headers: {
+			Accept: "application/json",
+			"Content-Type": "application/json",
+		},
+		body: JSON.stringify({
+			folderId,
+			name,
+		}),
+	});
+
+export const deleteWorkspaceFolderRequest = (projectId: string, folderId: string): Promise<Response> =>
+	requestWorkspaceTree(`/projects/${projectId}/tree/folders?folderId=${encodeURIComponent(folderId)}`, {
+		method: "DELETE",
+		headers: {
+			Accept: "application/json",
+		},
+	});
+
+export const moveWorkspaceFolderRequest = (
+	projectId: string,
+	folderId: string,
+	folderNodeId: string,
+	parentFolderId: string | null,
+	parentNodeId: string | null,
+	targetIndex: number,
+): Promise<Response> =>
+	requestWorkspaceTree(`/projects/${projectId}/tree/folders/move`, {
+		method: "PATCH",
+		headers: {
+			Accept: "application/json",
+			"Content-Type": "application/json",
+		},
+		body: JSON.stringify({
+			folderId,
+			folderNodeId,
+			parentFolderId,
+			parentNodeId,
+			targetIndex,
+		}),
+	});
+
+export const createWorkspaceItemRequest = (
+	projectId: string,
+	name: string,
+	itemType: WorkspaceItemTypeId,
+	parentFolderId: string | null,
+): Promise<Response> =>
+	requestWorkspaceTree(`/projects/${projectId}/tree/items`, {
+		method: "POST",
+		headers: {
+			Accept: "application/json",
+			"Content-Type": "application/json",
+		},
+		body: JSON.stringify({
+			name,
+			itemType,
+			parentFolderId,
+		}),
+	});
+
+export const deleteWorkspaceItemRequest = (projectId: string, itemId: string): Promise<Response> =>
+	requestWorkspaceTree(`/projects/${projectId}/tree/items?itemId=${encodeURIComponent(itemId)}`, {
+		method: "DELETE",
+		headers: {
+			Accept: "application/json",
+		},
+	});
+
+export const moveWorkspaceItemRequest = (
+	projectId: string,
+	itemId: string,
+	itemNodeId: string,
+	parentFolderId: string | null,
+	parentNodeId: string | null,
+	targetIndex: number,
+): Promise<Response> =>
+	requestWorkspaceTree(`/projects/${projectId}/tree/items/move`, {
+		method: "PATCH",
+		headers: {
+			Accept: "application/json",
+			"Content-Type": "application/json",
+		},
+		body: JSON.stringify({
+			itemId,
+			itemNodeId,
+			parentFolderId,
+			parentNodeId,
+			targetIndex,
+		}),
+	});

Frontend/src/components/workspace-navigation/shared/workspaceTree.types.ts

@@ -0,0 +1,43 @@
+import type { Accessor, Setter } from "solid-js";
+import type { WorkspaceItemTypeId, WorkspaceTreeNode } from "../../app-shell/data/shell.data";
+
+export type PersistedWorkspaceTreeNodeRecord = {
+	id: string;
+	path: string;
+	label: string;
+	kind: "folder" | "item";
+	itemType?: string;
+	children?: PersistedWorkspaceTreeNodeRecord[];
+};
+
+export type WorkspaceTreeResponse = {
+	data?: {
+		nodes?: PersistedWorkspaceTreeNodeRecord[];
+	};
+	error?: string;
+	message?: string;
+};
+
+export type WorkspaceMutationResponse = {
+	error?: string;
+	message?: string;
+};
+
+export type UseWorkspaceTreeDataOptions = {
+	activeProjectId: Accessor<string>;
+	fallbackWorkspaceTree: Accessor<readonly WorkspaceTreeNode[]>;
+};
+
+export type UseWorkspaceTreeDataResult = {
+	workspaceTreeNodes: Accessor<readonly WorkspaceTreeNode[]>;
+	setWorkspaceTreeNodes: Setter<readonly WorkspaceTreeNode[]>;
+	resolveFolderPath: (folderId: string) => string | null;
+	resolveItemPath: (itemId: string) => string | null;
+	createFolder: (name: string, parentId: string | null) => Promise<boolean>;
+	renameFolder: (folderId: string, name: string) => Promise<boolean>;
+	deleteFolder: (folderId: string) => Promise<boolean>;
+	moveFolder: (folderId: string, parentId: string | null, targetIndex: number) => Promise<boolean>;
+	createItem: (name: string, itemType: WorkspaceItemTypeId, parentId: string | null) => Promise<boolean>;
+	deleteItem: (itemId: string) => Promise<boolean>;
+	moveItem: (itemId: string, parentId: string | null, targetIndex: number) => Promise<boolean>;
+};

Frontend/src/entry-client.tsx

@@ -3,7 +3,7 @@
 // @refresh reload
 import { mount, StartClient } from "@solidjs/start/client";
 import type { JSX } from "solid-js";
-import { initializeThemeRuntime } from "./theme/runtime";
+import { initializeThemeRuntime } from "./helper/themeRuntime";
 
 const getAppRoot = (): HTMLElement => {
 	const appRoot = document.getElementById("app");

Frontend/src/entry-server.tsx

@@ -3,7 +3,7 @@
 // @refresh reload
 import type { JSX } from "solid-js";
 import { createHandler, StartServer } from "@solidjs/start/server";
-import { DEFAULT_THEME, THEME_STORAGE_KEY } from "./theme/runtime";
+import { DEFAULT_THEME, THEME_STORAGE_KEY } from "./helper/themeRuntime";
 import { THEME_MODE_NAMES } from "./theme/schema";
 
 const themeBootstrapScript = `

Frontend/src/helper/createLongPressGesture.ts

@@ -1,3 +1,5 @@
+// Path: Frontend/src/helper/createLongPressGesture.ts
+
 import type { JSX } from "solid-js";
 
 type PointerHandler = NonNullable<JSX.DOMAttributes<Element>["onPointerDown"]>;

Frontend/src/helper/themeRuntime.ts

@@ -1,7 +1,13 @@
-// Path: Frontend/src/theme/runtime.ts
+// Path: Frontend/src/helper/themeRuntime.ts
 
-import { defaultThemePresetMeta, defaultThemePresetPath, resolveThemePresetPath } from "./presets";
-import { createCssVariableMap, isThemeModeName, validateThemeDefinition, type ThemeDefinition, type ThemeModeName } from "./schema";
+import { defaultThemePresetMeta, defaultThemePresetPath, resolveThemePresetPath } from "../theme/presets";
+import {
+	createCssVariableMap,
+	isThemeModeName,
+	validateThemeDefinition,
+	type ThemeDefinition,
+	type ThemeModeName,
+} from "../theme/schema";
 
 export type Theme = ThemeModeName;