Merge branch 'Features/Frontend/Future-Model-Prep'

Frontend/src/app.tsx

@@ -3,6 +3,7 @@
 import type { JSX } from "solid-js";
 import { AppShell } from "./components/shell/AppShell/AppShell";
 import "./styles/main.scss";
+import "./styles/user-overrides.scss";
 
 const App = (): JSX.Element => {
 	return <AppShell />;

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

@@ -79,7 +79,7 @@ export const AppShell = (): JSX.Element => {
 	};
 
 	return (
-		<div class={styles.shell}>
+		<div class={styles.shell} data-ui="app-shell">
 			<TopBar
 				theme={themeState()}
 				onToggleTheme={toggleTheme}
@@ -96,15 +96,18 @@ export const AppShell = (): JSX.Element => {
 					[styles.bodyRailCollapsed]: isRailCollapsed(),
 					[styles.bodySidebarCollapsed]: isSidebarCollapsed(),
 				}}
+				data-slot="shell-body"
+				data-rail-collapsed={isRailCollapsed() ? "true" : "false"}
+				data-sidebar-collapsed={isSidebarCollapsed() ? "true" : "false"}
 			>
 				{/* Left server rail */}
-				<div class={styles.railColumn}>
+				<div class={styles.railColumn} data-slot="rail-column">
 					<LeftRail collapsed={isRailCollapsed()} />
 				</div>
 
 				{/* Sidebar + main workspace frame */}
-				<div class={styles.workspaceRegion}>
-					<div class={styles.sidebarColumn}>
+				<div class={styles.workspaceRegion} data-slot="workspace-region">
+					<div class={styles.sidebarColumn} data-slot="sidebar-column">
 						<WorkspaceSidebar
 							collapsed={isSidebarCollapsed()}
 							railCollapsed={isRailCollapsed()}
@@ -114,7 +117,7 @@ export const AppShell = (): JSX.Element => {
 						/>
 					</div>
 
-					<div class={styles.workspaceMain}>
+					<div class={styles.workspaceMain} data-slot="workspace-main">
 						{/* On mobile, top-bar menus become full workspace views instead of popovers. */}
 						<Show
 							when={isMobileViewport() && activeMobileWorkspaceView() !== null}
@@ -127,7 +130,7 @@ export const AppShell = (): JSX.Element => {
 								/>
 							}
 						>
-							<div class={styles.mobileWorkspaceView}>
+							<div class={styles.mobileWorkspaceView} data-slot="mobile-workspace-view" data-view={activeMobileWorkspaceView() ?? undefined}>
 								<Show when={activeMobileWorkspaceView() === "notifications"}>
 									<NotificationsMenu id="mobile-workspace-notifications" onSelect={closeMobileWorkspaceView} variant="workspace" />
 								</Show>
@@ -140,7 +143,7 @@ export const AppShell = (): JSX.Element => {
 				</div>
 
 				{/* Floating server dock overlay */}
-				<div class={styles.sidebarDock}>
+				<div class={styles.sidebarDock} data-slot="sidebar-dock">
 					<ServerDock />
 				</div>
 			</div>

Frontend/src/components/shell/MobileWorkspaceBrowser/MobileWorkspaceBrowser.module.scss

@@ -30,6 +30,12 @@
     border-bottom: 1px solid color-mix(in srgb, var(--color-border) 84%, transparent);
   }
 
+  .headerActions {
+    display: inline-flex;
+    align-items: center;
+    gap: var(--space-2);
+  }
+
   .brandBlock {
     min-width: 0;
     display: grid;
@@ -74,6 +80,22 @@
     color: var(--color-text-subtle);
   }
 
+  .createButton {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    gap: var(--space-2);
+    min-height: var(--control-size-md);
+    padding: 0 var(--space-3);
+    border: 1px solid color-mix(in srgb, var(--color-border-strong, var(--color-border)) 82%, transparent);
+    border-radius: 999px;
+    background: color-mix(in srgb, var(--color-surface) 94%, var(--color-canvas) 6%);
+    color: var(--color-text);
+    box-shadow: var(--shadow-soft);
+    font: inherit;
+    font-weight: var(--font-weight-semibold);
+  }
+
   .sheetBody {
     min-height: 0;
     display: grid;

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

@@ -1,6 +1,22 @@
-import { For, Show, type JSX } from "solid-js";
-import { ChevronRight, X } from "../../../lib/icons";
-import { activeProject, activeServer, workspaceStaticItems, workspaceTree, type SidebarItem, type WorkspaceTreeNode } from "../data/shell.data";
+import { For, Show, createSignal, type JSX } from "solid-js";
+import { ChevronRight, Plus, X } from "../../../lib/icons";
+import { createLongPressGesture } from "../createLongPressGesture";
+import {
+	activeProject,
+	activeServer,
+	createWorkspaceStaticTarget,
+	createWorkspaceSurfaceTarget,
+	createWorkspaceTreeTarget,
+	getWorkspaceNodeIcon,
+	workspaceStaticItems,
+	workspaceTree,
+	type SidebarItem,
+	type WorkspaceContextMenuAction,
+	type WorkspaceContextMenuTarget,
+	type WorkspaceStaticItem,
+	type WorkspaceTreeNode,
+} from "../data/shell.data";
+import { WorkspaceMobileActionSheet } from "../WorkspaceMobileActionSheet/WorkspaceMobileActionSheet";
 import styles from "./MobileWorkspaceBrowser.module.scss";
 
 type MobileWorkspaceBrowserProps = {
@@ -10,33 +26,37 @@ type MobileWorkspaceBrowserProps = {
 
 const TreeRow = (props: { node: WorkspaceTreeNode; depth?: number }): JSX.Element => {
 	const depth = props.depth ?? 0;
-	const Icon = props.node.icon;
+	const Icon = getWorkspaceNodeIcon(props.node);
 	const hasChildren = (props.node.children?.length ?? 0) > 0;
 
 	return (
-		<li class={styles.treeListItem}>
-			<button classList={{ [styles.treeRow]: true, [styles.treeRowActive]: props.node.active ?? false, [styles.treeRowBranch]: hasChildren }} type="button" style={{ "--tree-depth": `${depth}` }}>
-				<span class={styles.treeRowLead}>
-					<Icon size={16} strokeWidth={2} />
-					<span class={styles.treeLabel}>{props.node.label}</span>
-				</span>
+		<button
+			classList={{
+				[styles.treeRow]: true,
+				[styles.treeRowActive]: props.node.active ?? false,
+				[styles.treeRowBranch]: hasChildren,
+			}}
+			type="button"
+			style={{ "--tree-depth": `${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>
-
-			<Show when={hasChildren}>
-				<ul class={styles.treeListNested}>
-					<For each={props.node.children}>{(child): JSX.Element => <TreeRow node={child} depth={depth + 1} />}</For>
-				</ul>
-			</Show>
-		</li>
+			<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>
 	);
 };
 
@@ -44,68 +64,184 @@ const StaticRow = (props: { item: SidebarItem }): JSX.Element => {
 	const Icon = props.item.icon;
 
 	return (
-		<li class={styles.treeListItem}>
-			<button classList={{ [styles.treeRow]: true, [styles.treeRowActive]: props.item.active ?? false }} type="button" style={{ "--tree-depth": "0" }}>
-				<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>
+		<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 [actionSheetTarget, setActionSheetTarget] = createSignal<WorkspaceContextMenuTarget | null>(null);
 	const sectionNodes = workspaceTree.filter((node) => (node.children?.length ?? 0) > 0);
 	const looseNodes = workspaceTree.filter((node) => (node.children?.length ?? 0) === 0);
+	const workspaceTarget = createWorkspaceSurfaceTarget(activeProject);
+	const openActionSheet = (target: WorkspaceContextMenuTarget): void => {
+		setActionSheetTarget(target);
+	};
+	const closeActionSheet = (): void => {
+		setActionSheetTarget(null);
+	};
+	const openWorkspaceActionSheet = (): void => {
+		openActionSheet(workspaceTarget);
+	};
+
+	const handleActionSelect = (_action: WorkspaceContextMenuAction, _target: WorkspaceContextMenuTarget): void => {
+		// Mobile first pass only establishes the action-sheet IA and long-press behavior.
+	};
+
+	const workspaceLongPress = createLongPressGesture({
+		onLongPress: openWorkspaceActionSheet,
+	});
 
 	return (
 		<Show when={props.open}>
-			<div class={styles.browserLayer}>
-				<section class={styles.sheet} aria-label="Mobile workspace browser">
-					<header class={styles.sheetHeader}>
-						<div class={styles.brandBlock}>
+			<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}>{activeProject.name}</strong>
 							<span class={styles.brandContext}>{activeServer.name}</span>
 						</div>
 
-						<button class={styles.closeButton} type="button" aria-label="Close workspace browser" onClick={props.onClose}>
-							<X size={18} strokeWidth={2} />
-						</button>
+						<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}>
-						<section class={styles.sectionBlock}>
+					<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}>
-								<For each={workspaceStaticItems}>{(item): JSX.Element => <StaticRow item={item} />}</For>
+							<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}>
+						<section class={styles.sectionBlock} data-slot="mobile-workspace-section" data-section-id="items">
 							<span class={styles.sectionLabel}>Items</span>
-							<ul class={styles.treeList}>
-								<For each={sectionNodes}>{(node): JSX.Element => <TreeRow node={node} />}</For>
+							<ul class={styles.treeList} data-slot="mobile-workspace-list" data-section-id="items">
+								<WorkspaceTreeBranch nodes={sectionNodes} onOpenActionSheet={openActionSheet} />
 							</ul>
 						</section>
 
 						<Show when={looseNodes.length > 0}>
-							<section class={styles.sectionBlock}>
+							<section class={styles.sectionBlock} data-slot="mobile-workspace-section" data-section-id="more">
 								<span class={styles.sectionLabel}>More</span>
-								<ul class={styles.treeList}>
-									<For each={looseNodes}>{(node): JSX.Element => <TreeRow node={node} />}</For>
+								<ul class={styles.treeList} data-slot="mobile-workspace-list" data-section-id="more">
+									<WorkspaceTreeBranch nodes={looseNodes} onOpenActionSheet={openActionSheet} />
 								</ul>
 							</section>
 						</Show>
 					</div>
 				</section>
+
+				<WorkspaceMobileActionSheet
+					target={actionSheetTarget()}
+					onClose={closeActionSheet}
+					onSelect={handleActionSelect}
+				/>
 			</div>
 		</Show>
 	);

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

@@ -6,12 +6,12 @@ import styles from "./ServerDock.module.scss";
 
 export const ServerDock = (): JSX.Element => {
 	return (
-		<section class={styles.panel} aria-label="Server dock">
-			<div class={styles.identity}>
+		<section class={styles.panel} aria-label="Server dock" data-ui="server-dock" data-server-kind={activeServer.kind}>
+			<div class={styles.identity} data-slot="server-dock-identity">
 				<div class={styles.glyph} aria-hidden="true">
 					{activeServer.abbreviation}
 				</div>
-				<div class={styles.copy}>
+				<div class={styles.copy} data-slot="server-dock-copy">
 					<span class={styles.name}>{activeServer.name}</span>
 					<Show
 						when={activeServer.kind === "organization"}
@@ -26,13 +26,13 @@ export const ServerDock = (): JSX.Element => {
 			</div>
 
 			<Show when={activeServer.dockActions.length > 0}>
-				<div class={styles.actions}>
+				<div class={styles.actions} data-slot="server-dock-actions">
 					<For each={activeServer.dockActions}>
 						{(item): JSX.Element => {
 							const Icon = item.icon;
 
 							return (
-								<button type="button" class={styles.action} aria-label={item.label} title={item.label}>
+								<button type="button" class={styles.action} aria-label={item.label} title={item.label} data-slot="server-dock-action" data-action-id={item.id}>
 									<Icon size={16} strokeWidth={2} />
 									<span class={styles.actionLabel}>{item.label}</span>
 								</button>

Frontend/src/components/shell/TopBar/NotificationsMenu.tsx

@@ -27,9 +27,11 @@ export const NotificationsMenu = (props: NotificationsMenuProps): JSX.Element =>
 			role="menu"
 			aria-label="Notifications"
 			ref={props.menuRef}
+			data-ui="notifications-menu"
+			data-variant={variant}
 		>
-			<div class={styles.header}>
-				<div class={styles.headerCopy}>
+			<div class={styles.header} data-slot="notifications-header">
+				<div class={styles.headerCopy} data-slot="notifications-header-copy">
 					<strong class={styles.title}>Notifications</strong>
 					<span class={styles.subtitle}>
 						{unreadNotificationCount > 0
@@ -45,7 +47,7 @@ export const NotificationsMenu = (props: NotificationsMenuProps): JSX.Element =>
 				</Show>
 			</div>
 
-			<div class={styles.listWrap}>
+			<div class={styles.listWrap} data-slot="notifications-body">
 				<Show when={!hasNotifications}>
 					<div class={styles.stateCard}>
 						<span class={styles.stateIcon} aria-hidden="true">
@@ -67,12 +69,12 @@ export const NotificationsMenu = (props: NotificationsMenuProps): JSX.Element =>
 				</Show>
 
 				<Show when={unreadItems.length > 0}>
-					<section class={styles.section} aria-label="Unread notifications">
+					<section class={styles.section} aria-label="Unread notifications" data-slot="notifications-section" data-section-id="unread">
 						<span class={styles.sectionLabel}>Unread</span>
-						<div class={styles.list}>
+						<div class={styles.list} data-slot="notifications-list" data-section-id="unread">
 							<For each={unreadItems}>
 								{(item): JSX.Element => (
-									<button type="button" role="menuitem" classList={{ [styles.item]: true, [styles.itemUnread]: true }} onClick={props.onSelect}>
+									<button type="button" role="menuitem" classList={{ [styles.item]: true, [styles.itemUnread]: true }} data-slot="notification-item" data-state="unread" onClick={props.onSelect}>
 										<span class={styles.itemMarker} aria-hidden="true" />
 										<div class={styles.itemBody}>
 											<span class={styles.itemTitle}>{item.title}</span>
@@ -87,12 +89,12 @@ export const NotificationsMenu = (props: NotificationsMenuProps): JSX.Element =>
 				</Show>
 
 				<Show when={earlierItems.length > 0}>
-					<section class={styles.section} aria-label="Earlier notifications">
+					<section class={styles.section} aria-label="Earlier notifications" data-slot="notifications-section" data-section-id="earlier">
 						<span class={styles.sectionLabel}>Earlier</span>
-						<div class={styles.list}>
+						<div class={styles.list} data-slot="notifications-list" data-section-id="earlier">
 							<For each={earlierItems}>
 								{(item): JSX.Element => (
-									<button type="button" role="menuitem" class={styles.item} onClick={props.onSelect}>
+									<button type="button" role="menuitem" class={styles.item} data-slot="notification-item" data-state="read" onClick={props.onSelect}>
 										<span class={styles.itemMarkerMuted} aria-hidden="true" />
 										<div class={styles.itemBody}>
 											<span class={styles.itemTitle}>{item.title}</span>
@@ -107,7 +109,7 @@ export const NotificationsMenu = (props: NotificationsMenuProps): JSX.Element =>
 				</Show>
 			</div>
 
-			<div class={styles.footer}>
+			<div class={styles.footer} data-slot="notifications-footer">
 				<button type="button" role="menuitem" class={styles.footerAction} onClick={props.onSelect}>
 					<Settings size={16} strokeWidth={2} />
 					<span>Notification settings</span>

Frontend/src/components/shell/TopBar/ProfileMenu.tsx

@@ -23,8 +23,10 @@ export const ProfileMenu = (props: ProfileMenuProps): JSX.Element => {
 			role="menu"
 			aria-label="Profile menu"
 			ref={props.menuRef}
+			data-ui="profile-menu"
+			data-variant={variant}
 		>
-			<div class={styles.summary}>
+			<div class={styles.summary} data-slot="profile-summary">
 				<div class={styles.avatar} aria-hidden="true">
 					<span class={styles.avatarRing} />
 					<span class={styles.avatarCore}>
@@ -40,10 +42,10 @@ export const ProfileMenu = (props: ProfileMenuProps): JSX.Element => {
 				</div>
 			</div>
 
-			<div class={styles.sections}>
+			<div class={styles.sections} data-slot="profile-sections">
 				<For each={profileMenuSections}>
 					{(section): JSX.Element => (
-						<div class={styles.section}>
+						<div class={styles.section} data-slot="profile-section" data-section-id={section.id}>
 							<For each={section.items}>
 								{(item): JSX.Element => {
 									const Icon = item.icon;
@@ -52,11 +54,14 @@ export const ProfileMenu = (props: ProfileMenuProps): JSX.Element => {
 										<button
 											type="button"
 											role="menuitem"
-											classList={{
-												[styles.item]: true,
-												[styles.itemDanger]: item.tone === "danger",
-											}}
-											onClick={props.onSelect}
+										classList={{
+											[styles.item]: true,
+											[styles.itemDanger]: item.tone === "danger",
+										}}
+										data-slot="profile-action"
+										data-action-id={item.id}
+										data-tone={item.tone ?? "default"}
+										onClick={props.onSelect}
 										>
 											<span class={styles.itemIcon} aria-hidden="true">
 												<Icon size={16} strokeWidth={2} />

Frontend/src/components/shell/TopBar/TopBar.tsx

@@ -21,20 +21,20 @@ type TopBarProps = {
 
 export const TopBar = (props: TopBarProps): JSX.Element => {
 	return (
-		<header class={styles.topBar}>
-			<div class={styles.identity}>
+		<header class={styles.topBar} data-ui="top-bar">
+			<div class={styles.identity} data-slot="top-bar-identity">
 				<span class={styles.eyebrow}>Moku Work</span>
 				<DepartmentSelector />
 			</div>
 
-			<div class={styles.controls}>
-				<div class={styles.actions}>
+			<div class={styles.controls} data-slot="top-bar-controls">
+				<div class={styles.actions} data-slot="top-bar-actions">
 					<For each={topBarActions}>
 						{(item): JSX.Element => {
 							const Icon = item.icon;
 
 							return (
-								<button class={styles.actionButton} type="button" aria-label={item.label} title={item.label}>
+								<button class={styles.actionButton} type="button" aria-label={item.label} title={item.label} data-slot="top-bar-action" data-action-id={item.id}>
 									<Icon size={18} strokeWidth={2} />
 								</button>
 							);

Frontend/src/components/shell/WorkspaceContextMenu/WorkspaceContextMenu.module.scss

@@ -0,0 +1,194 @@
+.menu {
+	--context-menu-width: 13.5rem;
+	position: fixed;
+	width: min(var(--context-menu-width), calc(100vw - (var(--space-4) * 2)));
+	display: grid;
+	gap: 0;
+	padding: var(--space-1);
+	border: 1px solid color-mix(in srgb, var(--color-border-strong) 56%, transparent);
+	border-radius: calc(var(--radius-md) + (var(--space-1) / 2));
+	background: var(--color-surface);
+	box-shadow: var(--shadow-soft);
+	z-index: 2147483647;
+	user-select: none;
+}
+
+.header {
+	display: grid;
+	gap: calc(var(--space-1) / 2);
+	padding: var(--space-2) calc(var(--space-2) + (var(--space-1) / 2));
+}
+
+.eyebrow {
+	@include text-caption;
+	color: var(--color-text-muted);
+	text-transform: uppercase;
+	letter-spacing: 0.06em;
+}
+
+.title {
+	@include text-label;
+	color: var(--color-text);
+	font-weight: var(--font-weight-title);
+}
+
+.sectionList {
+	display: grid;
+	gap: 0;
+}
+
+.sectionListCompact {
+	gap: calc(var(--space-1) / 2);
+}
+
+.section {
+	display: grid;
+	gap: 0;
+}
+
+.section:first-child {
+	padding-top: calc(var(--space-1) / 2);
+}
+
+.section + .section {
+	margin-top: calc(var(--space-1) / 2);
+	padding-top: var(--space-2);
+	border-top: 1px solid color-mix(in srgb, var(--color-border) 78%, transparent);
+}
+
+.sectionLabel {
+	@include text-caption;
+	color: var(--color-text-subtle);
+	padding: 0 var(--space-2);
+	text-transform: uppercase;
+	letter-spacing: 0.04em;
+}
+
+.actionList {
+	display: grid;
+	gap: 0;
+}
+
+.actionItem {
+	position: relative;
+}
+
+.action {
+	width: 100%;
+	min-height: calc(var(--control-size-md) - var(--space-2));
+	display: inline-flex;
+	align-items: center;
+	justify-content: flex-start;
+	gap: var(--space-2);
+	padding: var(--space-2) calc(var(--space-2) + (var(--space-1) / 2));
+	border: 1px solid transparent;
+	border-radius: var(--radius-sm);
+	background: transparent;
+	color: var(--color-text);
+	text-align: left;
+	font-size: var(--font-size-label);
+	line-height: var(--line-height-label);
+	font-weight: var(--font-weight-label);
+	transition:
+		background var(--motion-duration-fast) var(--motion-ease-standard),
+		border-color var(--motion-duration-fast) var(--motion-ease-standard),
+		color var(--motion-duration-fast) var(--motion-ease-standard);
+}
+
+.actionCreate {
+	border-color: transparent;
+	background: transparent;
+	font-weight: var(--font-weight-title);
+	box-shadow: none;
+}
+
+.actionCreate:hover,
+.actionCreate:focus-visible,
+.actionCreate.actionSubmenuOpen {
+	background: color-mix(in srgb, var(--color-surface-hover) 82%, var(--color-surface));
+	border-color: color-mix(in srgb, var(--color-border) 72%, transparent);
+}
+
+.actionCreateIcon {
+	width: calc(var(--control-size-md) - var(--space-3));
+	height: calc(var(--control-size-md) - var(--space-3));
+	display: inline-flex;
+	align-items: center;
+	justify-content: center;
+	border-radius: var(--radius-sm);
+	background: color-mix(in srgb, var(--color-surface-hover) 72%, var(--color-surface));
+	color: var(--color-text);
+	box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-border) 74%, transparent);
+}
+
+.actionLabel {
+	min-width: 0;
+}
+
+.actionMeta {
+	margin-left: auto;
+	display: inline-flex;
+	align-items: center;
+	justify-content: flex-end;
+	gap: var(--space-2);
+	padding-left: var(--space-3);
+}
+
+.actionShortcut {
+	color: var(--color-text-muted);
+	font-size: var(--font-size-caption);
+	line-height: var(--line-height-caption);
+	font-weight: var(--font-weight-caption);
+	white-space: nowrap;
+}
+
+.actionChevron {
+	color: var(--color-text-subtle);
+	flex: 0 0 auto;
+}
+
+.actionSubmenuOpen {
+	background: color-mix(in srgb, var(--color-surface-hover) 82%, var(--color-surface));
+	border-color: color-mix(in srgb, var(--color-border-strong) 72%, transparent);
+}
+
+.action:hover,
+.action:focus-visible {
+	background: color-mix(in srgb, var(--color-surface-hover) 78%, var(--color-surface));
+	border-color: color-mix(in srgb, var(--color-border) 72%, transparent);
+}
+
+.actionDanger {
+	color: var(--color-danger-text, var(--color-text));
+}
+
+.actionDanger:hover,
+.actionDanger:focus-visible {
+	background: color-mix(in srgb, var(--color-danger-soft, var(--color-surface-hover)) 72%, transparent);
+	border-color: color-mix(in srgb, var(--color-danger-border, var(--color-border)) 72%, transparent);
+	color: var(--color-danger-text, var(--color-text));
+}
+
+.submenu {
+	position: absolute;
+	top: calc(var(--space-1) * -1);
+	left: calc(100% + var(--space-2));
+	width: min(var(--context-menu-width), calc(100vw - (var(--space-4) * 2)));
+	padding: var(--space-1);
+	border: 1px solid color-mix(in srgb, var(--color-border-strong) 56%, transparent);
+	border-radius: calc(var(--radius-md) + (var(--space-1) / 2));
+	background: var(--color-surface);
+	box-shadow: var(--shadow-soft);
+	z-index: 2147483647;
+}
+
+.submenuList {
+	display: grid;
+	gap: var(--space-1);
+}
+
+@include respond-down(mobile) {
+	.menu {
+		display: none;
+	}
+}

Frontend/src/components/shell/WorkspaceContextMenu/WorkspaceContextMenu.tsx

@@ -0,0 +1,242 @@
+import { For, Show, createEffect, createMemo, createSignal, onMount, type JSX } from "solid-js";
+import { Portal } from "solid-js/web";
+import { ChevronRight, Plus } from "../../../lib/icons";
+import {
+	getWorkspaceContextMenuEyebrow,
+	getWorkspaceContextMenuSections,
+	type WorkspaceContextMenuAction,
+	type WorkspaceContextMenuShortcut,
+	type WorkspaceContextMenuTarget,
+} from "../data/shell.data";
+import styles from "./WorkspaceContextMenu.module.scss";
+
+type ShortcutPlatform = "mac" | "windows";
+
+type NavigatorWithUserAgentData = Navigator & {
+	userAgentData?: {
+		platform?: string;
+	};
+};
+
+type WorkspaceContextMenuPosition = {
+	x: number;
+	y: number;
+};
+
+type WorkspaceContextMenuProps = {
+	target: WorkspaceContextMenuTarget | null;
+	position: WorkspaceContextMenuPosition | null;
+	onClose: VoidFunction;
+	onSelect: (action: WorkspaceContextMenuAction, target: WorkspaceContextMenuTarget) => void;
+	menuRef: (element: HTMLDivElement) => void;
+};
+
+const getShortcutPlatform = (): ShortcutPlatform => {
+	if (typeof navigator === "undefined") {
+		return "mac";
+	}
+
+	const navigatorWithUserAgentData = navigator as NavigatorWithUserAgentData;
+
+	const platform =
+		typeof navigatorWithUserAgentData.userAgentData?.platform === "string"
+			? navigatorWithUserAgentData.userAgentData.platform
+			: navigator.platform;
+
+	return /mac|iphone|ipad|ipod/i.test(platform) ? "mac" : "windows";
+};
+
+const formatShortcut = (shortcut: WorkspaceContextMenuShortcut, platform: ShortcutPlatform): string => {
+	const keyLabel = (() => {
+		switch (shortcut.key) {
+			case "enter":
+				return platform === "mac" ? "↩" : "Enter";
+			case "delete":
+				return platform === "mac" ? "⌫" : "Del";
+			default:
+				return shortcut.key.toUpperCase();
+		}
+	})();
+
+	const modifierLabels =
+		shortcut.modifiers?.map((modifier) => {
+			switch (modifier) {
+				case "meta":
+					return platform === "mac" ? "⌘" : "Ctrl";
+				case "alt":
+					return platform === "mac" ? "⌥" : "Alt";
+				case "shift":
+					return platform === "mac" ? "⇧" : "Shift";
+			}
+		}) ?? [];
+
+	if (platform === "mac") {
+		return `${modifierLabels.join("")}${keyLabel}`;
+	}
+
+	return [...modifierLabels, keyLabel].join("+");
+};
+
+export const WorkspaceContextMenu = (props: WorkspaceContextMenuProps): JSX.Element => {
+	const [activeSubmenuActionId, setActiveSubmenuActionId] = createSignal<string | null>(null);
+	const [shortcutPlatform, setShortcutPlatform] = createSignal<ShortcutPlatform>("mac");
+	const sections = createMemo(() => (props.target ? getWorkspaceContextMenuSections(props.target) : []));
+	const handleActionSelect = (action: WorkspaceContextMenuAction, target: WorkspaceContextMenuTarget): void => {
+		props.onSelect(action, target);
+		props.onClose();
+	};
+	const menuState = createMemo<{
+		target: WorkspaceContextMenuTarget;
+		position: WorkspaceContextMenuPosition;
+	} | null>(() =>
+		props.target && props.position
+			? {
+				target: props.target,
+				position: props.position,
+			}
+			: null,
+	);
+	const showHeader = (): boolean => props.target?.kind !== "workspace";
+	const sectionHasLabel = createMemo(() => sections().some((section) => Boolean(section.label)));
+
+	onMount(() => {
+		setShortcutPlatform(getShortcutPlatform());
+	});
+
+	createEffect(() => {
+		void props.target;
+		setActiveSubmenuActionId(null);
+	});
+
+	return (
+		<Show when={menuState()}>
+			{(resolvedMenuState): JSX.Element => {
+				const target = resolvedMenuState().target;
+				const position = resolvedMenuState().position;
+
+				return (
+					<Portal>
+						<div
+							ref={props.menuRef}
+							class={styles.menu}
+							role="menu"
+							aria-label={`${target.label} context menu`}
+							data-ui="workspace-context-menu"
+							data-target-kind={target.kind}
+							data-item-type={target.kind === "item" ? target.itemType : undefined}
+							style={{
+								left: `${position.x}px`,
+								top: `${position.y}px`,
+							}}
+						>
+							<Show when={target.kind !== "workspace"}>
+								<header class={styles.header} data-slot="context-menu-header">
+									<span class={styles.eyebrow}>{getWorkspaceContextMenuEyebrow(target)}</span>
+									<strong class={styles.title}>{target.label}</strong>
+								</header>
+							</Show>
+
+							<div classList={{ [styles.sectionList]: true, [styles.sectionListCompact]: !sectionHasLabel() }} data-slot="context-menu-sections">
+								<For each={sections()}>
+									{(section): JSX.Element => (
+											<section class={styles.section} data-slot="context-menu-section" data-section-id={section.id}>
+												<Show when={section.label}>
+													<span class={styles.sectionLabel}>{section.label}</span>
+												</Show>
+
+												<div class={styles.actionList} data-slot="context-menu-action-list">
+													<For each={section.items}>
+														{(action): JSX.Element => {
+															const isSubmenuOpen = () => activeSubmenuActionId() === action.id;
+
+															return (
+														<div
+															class={styles.actionItem}
+															data-slot="context-menu-action-item"
+															data-action-id={action.id}
+															onMouseEnter={() => {
+																		setActiveSubmenuActionId(action.children ? action.id : null);
+																	}}
+																>
+															<button
+																type="button"
+																role="menuitem"
+																		classList={{
+																			[styles.action]: true,
+																			[styles.actionCreate]: action.id === "create",
+																	[styles.actionDanger]: action.tone === "danger",
+																	[styles.actionSubmenuOpen]: isSubmenuOpen(),
+																}}
+																data-slot="context-menu-action"
+																data-action-id={action.id}
+																data-tone={action.tone ?? "default"}
+															onClick={() => {
+																if (action.children) {
+																	setActiveSubmenuActionId(isSubmenuOpen() ? null : action.id);
+																	return;
+																}
+
+																handleActionSelect(action, target);
+															}}
+														>
+																		<Show when={action.id === "create"}>
+																			<span class={styles.actionCreateIcon} aria-hidden="true">
+																				<Plus size={14} strokeWidth={2.25} />
+																			</span>
+																		</Show>
+																		<span class={styles.actionLabel}>{action.label}</span>
+																		<div class={styles.actionMeta}>
+																			<Show when={action.shortcut}>
+																				<span class={styles.actionShortcut}>{formatShortcut(action.shortcut!, shortcutPlatform())}</span>
+																			</Show>
+																			<Show when={action.children}>
+																				<ChevronRight class={styles.actionChevron} size={16} strokeWidth={2} />
+																			</Show>
+																		</div>
+																	</button>
+
+																	<Show when={action.children && isSubmenuOpen()}>
+																<div class={styles.submenu} role="menu" aria-label={`${action.label} submenu`} data-slot="context-menu-submenu">
+																	<div class={styles.submenuList} data-slot="context-menu-submenu-list">
+																				<For each={action.children ?? []}>
+																					{(childAction): JSX.Element => (
+																			<button
+																				type="button"
+																				role="menuitem"
+																	classList={{
+																					[styles.action]: true,
+																					[styles.actionDanger]: childAction.tone === "danger",
+																				}}
+																				data-slot="context-menu-submenu-action"
+																				data-action-id={childAction.id}
+																				data-tone={childAction.tone ?? "default"}
+																				onClick={() => handleActionSelect(childAction, target)}
+																>
+																							<span class={styles.actionLabel}>{childAction.label}</span>
+																							<div class={styles.actionMeta}>
+																								<Show when={childAction.shortcut}>
+																									<span class={styles.actionShortcut}>{formatShortcut(childAction.shortcut!, shortcutPlatform())}</span>
+																								</Show>
+																							</div>
+																						</button>
+																					)}
+																				</For>
+																			</div>
+																		</div>
+																	</Show>
+																</div>
+															);
+														}}
+													</For>
+												</div>
+											</section>
+										)}
+								</For>
+							</div>
+						</div>
+					</Portal>
+				);
+			}}
+		</Show>
+	);
+};

Frontend/src/components/shell/WorkspaceContextMenu/createWorkspaceContextMenuController.ts

@@ -0,0 +1,134 @@
+import { createEffect, createSignal, onCleanup } from "solid-js";
+import type { WorkspaceContextMenuTarget } from "../data/shell.data";
+
+type WorkspaceContextMenuState = {
+	target: WorkspaceContextMenuTarget;
+	x: number;
+	y: number;
+};
+
+const readRootPixelToken = (name: string, fallback: number): number => {
+	if (typeof window === "undefined") {
+		return fallback;
+	}
+
+	const value = window.getComputedStyle(document.documentElement).getPropertyValue(name).trim();
+	const parsed = Number.parseFloat(value);
+
+	if (!Number.isFinite(parsed)) {
+		return fallback;
+	}
+
+	if (value.endsWith("px")) {
+		return parsed;
+	}
+
+	return parsed * 16;
+};
+
+const clampMenuPosition = (value: number, min: number, max: number): number => {
+	if (max <= min) {
+		return min;
+	}
+
+	return Math.min(Math.max(value, min), max);
+};
+
+export const createWorkspaceContextMenuController = () => {
+	const [menuState, setMenuState] = createSignal<WorkspaceContextMenuState | null>(null);
+	let menuRef: HTMLDivElement | undefined;
+
+	const closeMenu = (): void => {
+		setMenuState(null);
+	};
+
+	const repositionMenu = (): void => {
+		if (typeof window === "undefined" || !menuRef) {
+			return;
+		}
+
+		const current = menuState();
+
+		if (!current) {
+			return;
+		}
+
+		const viewportPadding = readRootPixelToken("--space-4", 16);
+		const rect = menuRef.getBoundingClientRect();
+		const nextX = clampMenuPosition(current.x, viewportPadding, window.innerWidth - rect.width - viewportPadding);
+		const nextY = clampMenuPosition(current.y, viewportPadding, window.innerHeight - rect.height - viewportPadding);
+
+		if (nextX === current.x && nextY === current.y) {
+			return;
+		}
+
+		setMenuState({ ...current, x: nextX, y: nextY });
+	};
+
+	const openMenu = (event: MouseEvent, target: WorkspaceContextMenuTarget): void => {
+		event.preventDefault();
+		setMenuState({ target, x: event.clientX, y: event.clientY });
+	};
+
+	const openMenuFromElement = (element: HTMLElement, target: WorkspaceContextMenuTarget): void => {
+		const rect = element.getBoundingClientRect();
+		setMenuState({
+			target,
+			x: rect.left + rect.width / 2,
+			y: rect.top + rect.height / 2,
+		});
+	};
+
+	createEffect(() => {
+		if (!menuState()) {
+			return;
+		}
+
+		if (typeof window === "undefined") {
+			return;
+		}
+
+		const frame = window.requestAnimationFrame(() => {
+			repositionMenu();
+		});
+
+		const handlePointerDown = (event: PointerEvent): void => {
+			if (!menuRef?.contains(event.target as Node)) {
+				closeMenu();
+			}
+		};
+
+		const handleKeyDown = (event: KeyboardEvent): void => {
+			if (event.key === "Escape") {
+				closeMenu();
+			}
+		};
+
+		const handleViewportChange = (): void => {
+			closeMenu();
+		};
+
+		document.addEventListener("pointerdown", handlePointerDown);
+		window.addEventListener("resize", handleViewportChange);
+		window.addEventListener("scroll", handleViewportChange, true);
+		window.addEventListener("keydown", handleKeyDown);
+
+		onCleanup(() => {
+			window.cancelAnimationFrame(frame);
+			document.removeEventListener("pointerdown", handlePointerDown);
+			window.removeEventListener("resize", handleViewportChange);
+			window.removeEventListener("scroll", handleViewportChange, true);
+			window.removeEventListener("keydown", handleKeyDown);
+		});
+	});
+
+	return {
+		menuState,
+		openMenu,
+		openMenuFromElement,
+		closeMenu,
+		setMenuRef: (element: HTMLDivElement): void => {
+			menuRef = element;
+		},
+	};
+};

Frontend/src/components/shell/WorkspaceMobileActionSheet/WorkspaceMobileActionSheet.module.scss

@@ -0,0 +1,146 @@
+.layer {
+	display: none;
+}
+
+@include respond-down(mobile) {
+	.layer {
+		position: fixed;
+		inset: 0;
+		display: block;
+		z-index: var(--z-modal);
+	}
+
+	.backdrop {
+		position: absolute;
+		inset: 0;
+		border: 0;
+		background: color-mix(in srgb, black 52%, transparent);
+	}
+
+	.sheet {
+		position: absolute;
+		right: 0;
+		bottom: 0;
+		left: 0;
+		max-height: calc(100dvh - (var(--space-12) * 2));
+		display: grid;
+		gap: var(--space-3);
+		padding: var(--space-3) var(--space-3) calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
+		border-top: 1px solid color-mix(in srgb, var(--color-border) 88%, transparent);
+		border-radius: var(--radius-xl) var(--radius-xl) 0 0;
+		background: var(--color-surface);
+		box-shadow: var(--shadow-strong);
+		overflow: auto;
+	}
+
+	.handle {
+		width: var(--space-10);
+		height: var(--space-1);
+		margin: 0 auto;
+		border-radius: var(--radius-pill);
+		background: color-mix(in srgb, var(--color-text-muted) 24%, transparent);
+	}
+
+	.header {
+		display: flex;
+		align-items: start;
+		justify-content: space-between;
+		gap: var(--space-3);
+		padding-bottom: var(--space-3);
+		border-bottom: 1px solid color-mix(in srgb, var(--color-border) 88%, transparent);
+	}
+
+	.headerCopy {
+		min-width: 0;
+		display: grid;
+		gap: calc(var(--space-1) / 2);
+	}
+
+	.eyebrow {
+		@include text-caption;
+		color: var(--color-text-muted);
+		text-transform: uppercase;
+		letter-spacing: 0.06em;
+	}
+
+	.title {
+		@include text-title;
+		color: var(--color-text);
+		font-weight: var(--font-weight-semibold);
+	}
+
+	.closeButton {
+		flex: 0 0 auto;
+		display: inline-flex;
+		align-items: center;
+		justify-content: center;
+		width: var(--control-size-md);
+		height: var(--control-size-md);
+		padding: 0;
+		border: 1px solid color-mix(in srgb, var(--color-border) 88%, transparent);
+		border-radius: var(--radius-pill);
+		background: color-mix(in srgb, var(--color-surface) 84%, var(--color-surface-elevated, var(--color-surface)) 16%);
+		color: var(--color-text-subtle);
+	}
+
+	.sectionList {
+		display: grid;
+		gap: var(--space-3);
+	}
+
+	.section {
+		display: grid;
+		gap: var(--space-2);
+	}
+
+	.section + .section {
+		padding-top: var(--space-3);
+		border-top: 1px solid color-mix(in srgb, var(--color-border) 92%, transparent);
+	}
+
+	.sectionLabel {
+		@include text-caption;
+		padding-inline: var(--space-1);
+		color: var(--color-text-muted);
+		text-transform: uppercase;
+		letter-spacing: 0.06em;
+	}
+
+	.actionList {
+		display: grid;
+		overflow: hidden;
+		border: 1px solid color-mix(in srgb, var(--color-border) 88%, transparent);
+		border-radius: var(--radius-lg);
+		background: color-mix(in srgb, var(--color-surface) 88%, var(--color-surface-elevated, var(--color-surface)) 12%);
+	}
+
+	.action {
+		min-width: 0;
+		width: 100%;
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		min-height: calc(var(--control-size-lg) + var(--space-2));
+		padding: 0 var(--space-3);
+		border: 0;
+		background: transparent;
+		color: var(--color-text);
+		text-align: left;
+	}
+
+	.action:active {
+		background: color-mix(in srgb, var(--color-text) 6%, transparent);
+	}
+
+	.action + .action {
+		border-top: 1px solid color-mix(in srgb, var(--color-border) 92%, transparent);
+	}
+
+	.actionLabel {
+		@include text-label;
+	}
+
+	.actionDanger {
+		color: var(--color-danger-text, var(--color-text));
+	}
+}

Frontend/src/components/shell/WorkspaceMobileActionSheet/WorkspaceMobileActionSheet.tsx

@@ -0,0 +1,134 @@
+import { For, Show, createMemo, type JSX } from "solid-js";
+import { Portal } from "solid-js/web";
+import { X } from "../../../lib/icons";
+import {
+	getWorkspaceContextMenuEyebrow,
+	getWorkspaceContextMenuSections,
+	type WorkspaceContextMenuAction,
+	type WorkspaceContextMenuSection,
+	type WorkspaceContextMenuTarget,
+} from "../data/shell.data";
+import styles from "./WorkspaceMobileActionSheet.module.scss";
+
+type WorkspaceMobileActionSheetProps = {
+	target: WorkspaceContextMenuTarget | null;
+	onClose: VoidFunction;
+	onSelect: (action: WorkspaceContextMenuAction, target: WorkspaceContextMenuTarget) => void;
+};
+
+type FlattenedActionSection = {
+	id: string;
+	label?: string;
+	items: readonly WorkspaceContextMenuAction[];
+};
+
+const flattenMobileSections = (
+	sections: readonly WorkspaceContextMenuSection[],
+): readonly FlattenedActionSection[] => {
+	// Mobile uses a flat action-sheet model, so desktop flyout groups become
+	// standalone labeled sections instead of nested menus.
+	return sections.flatMap((section) => {
+		const directActions = section.items.filter((action) => !action.children?.length);
+		const nestedSections = section.items
+			.filter((action) => action.children?.length)
+			.map((action) => ({
+				id: `${section.id}-${action.id}`,
+				label: action.label,
+				items: action.children ?? [],
+			}));
+
+		const flattenedSections: FlattenedActionSection[] = [];
+
+		if (directActions.length > 0) {
+			flattenedSections.push({
+				id: section.id,
+				label: section.label,
+				items: directActions,
+			});
+		}
+
+		return [...flattenedSections, ...nestedSections];
+	});
+};
+
+export const WorkspaceMobileActionSheet = (props: WorkspaceMobileActionSheetProps): JSX.Element => {
+	const sheetState = createMemo(() => {
+		if (!props.target) {
+			return null;
+		}
+
+		return {
+			target: props.target,
+			sections: flattenMobileSections(getWorkspaceContextMenuSections(props.target)),
+		};
+	});
+
+	const handleActionSelect = (action: WorkspaceContextMenuAction, target: WorkspaceContextMenuTarget): void => {
+		props.onSelect(action, target);
+		props.onClose();
+	};
+
+	return (
+		<Show when={sheetState()}>
+			{(sheetState): JSX.Element => {
+				const target = sheetState().target;
+				const sections = sheetState().sections;
+
+				return (
+					<Portal>
+					<div class={styles.layer} data-ui="workspace-mobile-action-sheet" data-target-kind={target.kind} data-item-type={target.kind === "item" ? target.itemType : undefined}>
+						<button class={styles.backdrop} type="button" aria-label="Close action sheet" data-slot="mobile-action-sheet-backdrop" onClick={props.onClose} />
+
+						<section class={styles.sheet} aria-label={`${target.label} actions`} data-slot="mobile-action-sheet-panel">
+							<div class={styles.handle} data-slot="mobile-action-sheet-handle" aria-hidden="true" />
+
+							<header class={styles.header} data-slot="mobile-action-sheet-header">
+								<div class={styles.headerCopy} data-slot="mobile-action-sheet-header-copy">
+										<span class={styles.eyebrow}>{getWorkspaceContextMenuEyebrow(target)}</span>
+										<strong class={styles.title}>{target.label}</strong>
+									</div>
+
+								<button class={styles.closeButton} type="button" aria-label="Close action sheet" data-slot="mobile-action-sheet-close" onClick={props.onClose}>
+										<X size={18} strokeWidth={2} />
+									</button>
+								</header>
+
+							<div class={styles.sectionList} data-slot="mobile-action-sheet-sections">
+									<For each={sections}>
+										{(section): JSX.Element => (
+											<section class={styles.section} data-slot="mobile-action-sheet-section" data-section-id={section.id}>
+												<Show when={section.label}>
+													<span class={styles.sectionLabel}>{section.label}</span>
+												</Show>
+
+												<div class={styles.actionList} data-slot="mobile-action-sheet-action-list">
+													<For each={section.items}>
+														{(action): JSX.Element => (
+															<button
+																type="button"
+																classList={{
+																	[styles.action]: true,
+																	[styles.actionDanger]: action.tone === "danger",
+																}}
+																data-slot="mobile-action-sheet-action"
+																data-action-id={action.id}
+																data-tone={action.tone ?? "default"}
+																onClick={() => handleActionSelect(action, target)}
+															>
+																<span class={styles.actionLabel}>{action.label}</span>
+															</button>
+														)}
+													</For>
+												</div>
+											</section>
+										)}
+									</For>
+								</div>
+							</section>
+						</div>
+					</Portal>
+				);
+			}}
+		</Show>
+	);
+};

Frontend/src/components/shell/WorkspaceSidebar/WorkspaceSidebar.tsx

@@ -1,9 +1,24 @@
 // Path: Frontend/src/components/shell/WorkspaceSidebar/WorkspaceSidebar.tsx
 
-import { For, Show, createSignal, type JSX } from "solid-js";
+import { For, Show, createMemo, createSignal, type JSX } from "solid-js";
 import { ChevronLeft, ChevronRight } from "../../../lib/icons";
 import { ProjectSelector } from "../ProjectSelector/ProjectSelector";
-import { workspaceSidebarHeaderActions, workspaceStaticItems, workspaceTree, type SidebarItem, type WorkspaceTreeNode } from "../data/shell.data";
+import {
+	activeProject,
+	createWorkspaceStaticTarget,
+	createWorkspaceSurfaceTarget,
+	createWorkspaceTreeTarget,
+	getWorkspaceNodeIcon,
+	workspaceSidebarHeaderActions,
+	workspaceStaticItems,
+	workspaceTree,
+	type WorkspaceContextMenuAction,
+	type WorkspaceContextMenuTarget,
+	type WorkspaceStaticItem,
+	type WorkspaceTreeNode,
+} from "../data/shell.data";
+import { WorkspaceContextMenu } from "../WorkspaceContextMenu/WorkspaceContextMenu";
+import { createWorkspaceContextMenuController } from "../WorkspaceContextMenu/createWorkspaceContextMenuController";
 import styles from "./WorkspaceSidebar.module.scss";
 
 type WorkspaceSidebarProps = {
@@ -12,8 +27,15 @@ type WorkspaceSidebarProps = {
 	onToggleRailCollapse: () => void;
 };
 
-const WorkspaceHomeEntry = (props: { item: SidebarItem }): JSX.Element => {
+const isContextMenuKeyboardTrigger = (event: KeyboardEvent): boolean => event.key === "ContextMenu" || (event.shiftKey && event.key === "F10");
+
+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>
@@ -26,6 +48,21 @@ const WorkspaceHomeEntry = (props: { item: SidebarItem }): JSX.Element => {
 				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>
@@ -37,14 +74,20 @@ const WorkspaceHomeEntry = (props: { item: SidebarItem }): JSX.Element => {
 	);
 };
 
-const WorkspaceTreeBranch = (props: { nodes: readonly WorkspaceTreeNode[]; depth?: number }): JSX.Element => {
+const WorkspaceTreeBranch = (props: {
+	nodes: readonly WorkspaceTreeNode[];
+	depth?: number;
+	onOpenContextMenu: (event: MouseEvent, target: WorkspaceContextMenuTarget) => void;
+	onOpenContextMenuFromKeyboard: (element: HTMLElement, target: WorkspaceContextMenuTarget) => void;
+}): JSX.Element => {
 	const depth = () => props.depth ?? 0;
 
 	return (
 		<ul class={styles.treeList} role="list">
 			<For each={props.nodes}>
 				{(node): JSX.Element => {
-					const Icon = node.icon;
+					const Icon = getWorkspaceNodeIcon(node);
+					const target = createWorkspaceTreeTarget(node);
 
 					return (
 						<li>
@@ -59,6 +102,22 @@ const WorkspaceTreeBranch = (props: { nodes: readonly WorkspaceTreeNode[]; depth
 								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"}
+								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}>{node.label}</span>
@@ -68,7 +127,12 @@ const WorkspaceTreeBranch = (props: { nodes: readonly WorkspaceTreeNode[]; depth
 							</button>
 
 							<Show when={node.children?.length}>
-								<WorkspaceTreeBranch nodes={node.children ?? []} depth={depth() + 1} />
+								<WorkspaceTreeBranch
+									nodes={node.children ?? []}
+									depth={depth() + 1}
+									onOpenContextMenu={props.onOpenContextMenu}
+									onOpenContextMenuFromKeyboard={props.onOpenContextMenuFromKeyboard}
+								/>
 							</Show>
 						</li>
 					);
@@ -78,86 +142,136 @@ const WorkspaceTreeBranch = (props: { nodes: readonly WorkspaceTreeNode[]; depth
 	);
 };
 
-export const WorkspaceSidebar = (props: WorkspaceSidebarProps): JSX.Element => {
+	export const WorkspaceSidebar = (props: WorkspaceSidebarProps): JSX.Element => {
 	const [isProjectDrawerOpen, setIsProjectDrawerOpen] = createSignal(false);
+	const contextMenu = createWorkspaceContextMenuController();
 	const railToggleLabel = (): string => (props.railCollapsed ? "Expand server rail" : "Collapse server rail");
+	const sidebarContextMenuTarget = createWorkspaceSurfaceTarget(activeProject);
+	const contextMenuTarget = createMemo(() => contextMenu.menuState()?.target ?? null);
+	const contextMenuPosition = createMemo(() => {
+		const state = contextMenu.menuState();
+
+		return state
+			? {
+				x: state.x,
+				y: state.y,
+			}
+			: null;
+	});
+
+	const handleContextActionSelect = (_action: WorkspaceContextMenuAction, _target: WorkspaceContextMenuTarget): void => {
+		// Initial implementation only establishes the menu IA and placement.
+	};
 
 	return (
-		<aside
-			classList={{
-				[styles.sidebar]: true,
-				[styles.sidebarCollapsed]: props.collapsed,
-			}}
-			aria-label="Left workspace sidebar"
-		>
-			<div
+		<>
+			<aside
 				classList={{
-					[styles.header]: true,
-					[styles.headerDrawerOpen]: isProjectDrawerOpen(),
+					[styles.sidebar]: true,
+					[styles.sidebarCollapsed]: props.collapsed,
+				}}
+				aria-label="Left workspace sidebar"
+				data-ui="workspace-sidebar"
+				data-collapsed={props.collapsed ? "true" : "false"}
+				onContextMenu={(event): void => {
+					contextMenu.openMenu(event, sidebarContextMenuTarget);
 				}}
 			>
-				<div class={styles.headerActions}>
-					<button
-						type="button"
-						classList={{
-							[styles.headerActionButton]: true,
-							[styles.headerCollapseButton]: true,
-						}}
-						aria-label={railToggleLabel()}
-						title={railToggleLabel()}
-						onClick={props.onToggleRailCollapse}
-					>
-						{props.railCollapsed ? <ChevronRight size={16} strokeWidth={2} /> : <ChevronLeft size={16} strokeWidth={2} />}
-					</button>
+				<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 Icon = action.icon;
+						<For each={workspaceSidebarHeaderActions}>
+							{(action): JSX.Element => {
+								const Icon = action.icon;
 
-							return (
-								<button type="button" class={styles.headerActionButton} aria-label={action.label} title={action.label}>
-									<Icon size={16} strokeWidth={2} />
-								</button>
-							);
-						}}
-					</For>
+								return (
+									<button type="button" class={styles.headerActionButton} aria-label={action.label} title={action.label} data-slot="workspace-sidebar-header-action" data-action-id={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 class={styles.headerControls}>
-					<ProjectSelector
-						compact={props.collapsed}
-						isOpen={isProjectDrawerOpen()}
-						onToggle={(): void => {
-							setIsProjectDrawerOpen(true);
-						}}
-						onClose={(): void => {
-							setIsProjectDrawerOpen(false);
-						}}
-					/>
-				</div>
-			</div>
-
-			<div
-				classList={{
-					[styles.section]: true,
-					[styles.sectionHidden]: isProjectDrawerOpen(),
-				}}
-			>
-				<Show when={!props.collapsed}>
-					<span class={styles.sectionLabel}>Workspace</span>
-				</Show>
-				<div class={styles.navScroller}>
-					<ul class={styles.navList} role="list">
-						<For each={workspaceStaticItems}>{(item): JSX.Element => <WorkspaceHomeEntry item={item} />}</For>
-					</ul>
-
+				<div
+					classList={{
+						[styles.section]: true,
+						[styles.sectionHidden]: isProjectDrawerOpen(),
+					}}
+					data-slot="workspace-sidebar-section"
+				>
 					<Show when={!props.collapsed}>
-						<div class={styles.treeSectionLabel}>Items</div>
+						<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>
 
-					<WorkspaceTreeBranch nodes={workspaceTree} />
+						<Show when={!props.collapsed}>
+							<div class={styles.treeSectionLabel}>Items</div>
+						</Show>
+
+						<div data-slot="workspace-tree-root">
+						<WorkspaceTreeBranch
+							nodes={workspaceTree}
+							onOpenContextMenu={contextMenu.openMenu}
+							onOpenContextMenuFromKeyboard={contextMenu.openMenuFromElement}
+						/>
+						</div>
+					</div>
 				</div>
-			</div>
-		</aside>
+			</aside>
+
+			<WorkspaceContextMenu
+				target={contextMenuTarget()}
+				position={contextMenuPosition()}
+				menuRef={contextMenu.setMenuRef}
+				onClose={contextMenu.closeMenu}
+				onSelect={handleContextActionSelect}
+			/>
+		</>
 	);
 };

Frontend/src/components/shell/createLongPressGesture.ts

@@ -0,0 +1,73 @@
+import type { JSX } from "solid-js";
+
+type PointerHandler = NonNullable<JSX.DOMAttributes<Element>["onPointerDown"]>;
+
+type LongPressGestureOptions = {
+	onLongPress: () => void;
+	delay?: number;
+	movementThreshold?: number;
+};
+
+type LongPressGestureHandlers = {
+	onPointerDown: PointerHandler;
+	onPointerMove: PointerHandler;
+	onPointerUp: PointerHandler;
+	onPointerCancel: PointerHandler;
+	onPointerLeave: PointerHandler;
+};
+
+export const createLongPressGesture = (options: LongPressGestureOptions): LongPressGestureHandlers => {
+	let timeoutId: number | undefined;
+	let originX = 0;
+	let originY = 0;
+
+	const delay = options.delay ?? 420;
+	const movementThreshold = options.movementThreshold ?? 10;
+
+	const clearPendingLongPress = (): void => {
+		if (typeof timeoutId === "number") {
+			window.clearTimeout(timeoutId);
+			timeoutId = undefined;
+		}
+	};
+
+	const onPointerDown: PointerHandler = (event): void => {
+		// Mobile long-press should only respond to the primary touch/pen pointer.
+		if (event.pointerType === "mouse" || !event.isPrimary) {
+			return;
+		}
+
+		originX = event.clientX;
+		originY = event.clientY;
+		clearPendingLongPress();
+		timeoutId = window.setTimeout(() => {
+			timeoutId = undefined;
+			options.onLongPress();
+		}, delay);
+	};
+
+	const onPointerMove: PointerHandler = (event): void => {
+		if (typeof timeoutId !== "number") {
+			return;
+		}
+
+		const deltaX = Math.abs(event.clientX - originX);
+		const deltaY = Math.abs(event.clientY - originY);
+
+		if (deltaX > movementThreshold || deltaY > movementThreshold) {
+			clearPendingLongPress();
+		}
+	};
+
+	const onPointerUp: PointerHandler = (): void => {
+		clearPendingLongPress();
+	};
+
+	return {
+		onPointerDown,
+		onPointerMove,
+		onPointerUp,
+		onPointerCancel: onPointerUp,
+		onPointerLeave: onPointerUp,
+	};
+};

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

@@ -82,16 +82,50 @@ export type SidebarItem = {
 	meta?: string;
 };
 
-export type WorkspaceTreeNode = {
+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;
 	label: string;
-	kind: "folder" | "board" | "doc";
+	kind: "folder";
 	icon: ShellIcon;
 	active?: boolean;
 	meta?: string;
 	children?: readonly WorkspaceTreeNode[];
 };
 
+export type WorkspaceItemNode = {
+	id: 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;
@@ -111,6 +145,159 @@ export type MobileBottomNavItem = {
 	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;
@@ -190,12 +377,13 @@ export const departmentItems: readonly DepartmentItem[] = [
 
 // Sidebar and topbar scaffold data
 // These static entries stay pinned in both desktop and mobile workspace navigation.
-export const workspaceStaticItems: readonly SidebarItem[] = [
-	{ id: "home", label: "Home", icon: Home, active: true },
-	{ id: "workspace-settings", label: "Settings", icon: Settings },
+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, boards, and docs are first-class siblings.
+// 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",
@@ -203,16 +391,16 @@ export const workspaceTree: readonly WorkspaceTreeNode[] = [
 		kind: "folder",
 		icon: Folder,
 		children: [
-			{ id: "roadmap-board", label: "Roadmap", kind: "board", icon: LayoutGrid, active: true },
-			{ id: "launch-brief", label: "Launch Brief", kind: "doc", icon: FileText },
+			{ 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: "doc", icon: FileText },
-					{ id: "signals-board", label: "Signals", kind: "board", icon: LayoutGrid, meta: "2" },
+					{ id: "interviews-doc", label: "Interviews", kind: "item", itemType: "core.doc" },
+					{ id: "signals-board", label: "Signals", kind: "item", itemType: "core.board.kanban", meta: "2" },
 				],
 			},
 		],
@@ -223,11 +411,11 @@ export const workspaceTree: readonly WorkspaceTreeNode[] = [
 		kind: "folder",
 		icon: Folder,
 		children: [
-			{ id: "system-doc", label: "Design System", kind: "doc", icon: FileText },
-			{ id: "review-board", label: "Review Queue", kind: "board", icon: LayoutGrid },
+			{ 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: "doc", icon: FileText },
+	{ id: "general-notes", label: "General Notes", kind: "item", itemType: "core.doc" },
 ] as const;
 
 export const workspaceSidebarHeaderActions: readonly SidebarHeaderAction[] = [
@@ -240,6 +428,111 @@ export const mobileBottomNavItems: readonly MobileBottomNavItem[] = [
 	{ 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: "duplicate-folder", label: "Duplicate", shortcut: { modifiers: ["meta"], key: "d" } },
+						{ 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: `duplicate-${actionPrefix}`, label: "Duplicate", shortcut: { modifiers: ["meta"], key: "d" } },
+						{ id: `move-${actionPrefix}`, label: "Move", shortcut: { modifiers: ["meta"], key: "m" } },
+						{ id: `delete-${actionPrefix}`, label: "Delete", shortcut: { modifiers: ["meta"], key: "delete" }, tone: "danger" },
+					],
+				},
+			] as const;
+		}
+	}
+};
+
 export const topBarActions: readonly TopBarAction[] = [
 	{ id: "search", label: "Search", icon: Search },
 ] as const;

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

@@ -39,28 +39,29 @@ export const WorkspaceHome = (props: WorkspaceHomeProps): JSX.Element => {
 	const breadcrumb = (): string => `${activeServer.name} / ${activeProject.name} / Home`;
 
 	return (
-		<main class={styles.viewport}>
-			<div class={styles.workspaceTopBar}>
-				<div class={styles.workspaceTopBarStart}>
+		<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}>
+				<div class={styles.workspaceTopBarCenter} data-slot="workspace-home-top-bar-center">
 					<span class={styles.workspaceBreadcrumb}>{breadcrumb()}</span>
 				</div>
 
-				<div class={styles.workspaceTopBarEnd} aria-hidden="true" />
+				<div class={styles.workspaceTopBarEnd} data-slot="workspace-home-top-bar-end" aria-hidden="true" />
 			</div>
 
-			<section class={styles.hero}>
+			<section class={styles.hero} data-slot="workspace-home-hero">
 				<span class={styles.eyebrow}>Server home</span>
 				<h1 class={styles.title}>{activeServer.name} is ready for its first real shell.</h1>
 				<p class={styles.description}>
@@ -68,10 +69,10 @@ export const WorkspaceHome = (props: WorkspaceHomeProps): JSX.Element => {
 				</p>
 			</section>
 
-			<section class={styles.grid} aria-label="Shell checkpoints">
+			<section class={styles.grid} aria-label="Shell checkpoints" data-slot="workspace-home-grid">
 				<For each={shellCheckpointCards}>
 					{(card): JSX.Element => (
-						<article class={styles.card}>
+						<article class={styles.card} data-slot="workspace-home-card">
 							<h2 class={styles.cardTitle}>{card.title}</h2>
 							<p class={styles.cardCopy}>{card.copy}</p>
 							<span class={styles.cardMeta}>{card.meta}</span>

Frontend/src/styles/user-overrides.scss

@@ -0,0 +1,41 @@
+/* Path: Frontend/src/styles/user-overrides.scss */
+
+/*
+	Optional global frontend override seam.
+
+	This file is imported after the core app styles so user or deployment-specific
+	overrides can layer on top without reshaping component code first.
+
+	Examples for later:
+	- import a tenant branding bundle
+	- apply a self-hosted custom theme
+	- override shared shell spacing or color tokens
+	- target stable `data-ui`, `data-slot`, or state attributes added in the app shell
+
+	You can either place raw overrides here directly or layer another stylesheet:
+
+	@use "./my-brand" as *;
+*/
+
+/*
+	Stable override hooks are intentionally exposed with global data attributes so
+	manual overrides do not depend on CSS module hash names.
+
+	Examples:
+
+	[data-ui="top-bar"] {
+		backdrop-filter: blur(24px);
+	}
+
+	[data-ui="workspace-sidebar"] [data-slot="workspace-tree-item"][data-kind="item"] {
+		border-radius: 12px;
+	}
+
+	[data-ui="workspace-context-menu"] [data-action-id="delete"] {
+		letter-spacing: 0.01em;
+	}
+
+	[data-ui="notifications-menu"][data-variant="workspace"] {
+		max-width: none;
+	}
+*/