Feat: Add responsive workspace shell

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

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+// Path: Frontend/src/components/shell/MobileBottomNav/MobileBottomNav.tsx
+
+import { For, type JSX } from "solid-js";
+import { activeProject, activeServer, mobileBottomNavItems, type MobileBottomNavItem } from "../data/shell.data";
+import styles from "./MobileBottomNav.module.scss";
+
+type MobileBottomNavProps = {
+	isBrowseOpen: boolean;
+	onBrowseToggle: VoidFunction;
+};
+
+const MobileNavEntry = (props: {
+	item: MobileBottomNavItem;
+	isActive: boolean;
+	onSelect?: VoidFunction;
+}): JSX.Element => {
+	const Icon = props.item.icon;
+
+	return (
+		<button
+			type="button"
+			onClick={() => props.onSelect?.()}
+			classList={{
+				[styles.navButton]: true,
+				[styles.navButtonActive]: props.isActive,
+			}}
+			aria-current={props.isActive ? "page" : undefined}
+			aria-expanded={props.item.id === "browse" ? props.isActive : undefined}
+			aria-label={props.item.label}
+			title={props.item.label}
+		>
+			<span class={styles.iconWrap} aria-hidden="true">
+				<Icon size={18} strokeWidth={2} />
+			</span>
+
+			<span class={styles.label}>{props.item.label}</span>
+		</button>
+	);
+};
+
+export const MobileBottomNav = (props: MobileBottomNavProps): JSX.Element => {
+	return (
+		<nav class={styles.mobileNav} aria-label="Mobile workspace navigation">
+			<div class={styles.contextBar}>
+				<span class={styles.contextServer}>{activeServer.name}</span>
+				<span class={styles.contextDivider}>/</span>
+				<span class={styles.contextProject}>{activeProject.name}</span>
+			</div>
+
+			<div class={styles.navGrid}>
+				<For each={mobileBottomNavItems}>
+					{(item): JSX.Element => (
+						<MobileNavEntry
+							item={item}
+							isActive={item.id === "browse" ? props.isBrowseOpen : (item.active ?? false) && !props.isBrowseOpen}
+							onSelect={item.id === "browse" ? props.onBrowseToggle : undefined}
+						/>
+					)}
+				</For>
+			</div>
+		</nav>
+	);
+};