feat(shared-ui, manacore/web): cross-app navigation enhancement (3 phases)

Phase 1: Enhanced App Drawer in PillNavigation
- appNavigationStore: localStorage-backed favorites, recents, usage counts
- AppDrawer: replaces PillDropdown for apps with search, favorites, recents, grid
- All apps using PillNavigation get this automatically

Phase 2: Cmd+K Command Palette (GlobalSpotlight)
- GlobalSpotlight: modal with app search, quick actions, keyboard navigation
- useGlobalSpotlight: Cmd+K / Ctrl+K keyboard listener
- Integrated into PillNavigation via optional spotlightActions prop

Phase 3: Improved /home page
- AppRow: horizontal scrollable app row for favorites/recents with pin toggle
- ActivityFeed: cross-app timeline (completed tasks, upcoming events, contacts)
- Replaced hardcoded 3-category layout with dynamic favorites, recents, activity
  feed, and usage-frequency sorted app grid

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared-ui/src/navigation/appNavigationStore.svelte.ts

@@ -0,0 +1,142 @@
+/**
+ * App Navigation Store
+ *
+ * Tracks favorite apps, recently visited apps, and usage counts.
+ * Persists to localStorage for cross-session retention.
+ * Pattern follows recentInputHistory.ts
+ */
+
+const STORAGE_KEY_FAVORITES = 'mana-app-favorites';
+const STORAGE_KEY_RECENT = 'mana-app-recent';
+const STORAGE_KEY_USAGE = 'mana-app-usage-counts';
+const MAX_RECENT = 8;
+
+export interface RecentAppEntry {
+	id: string;
+	timestamp: number;
+}
+
+// --- Standalone functions (non-reactive) ---
+
+export function getFavoriteApps(): string[] {
+	if (typeof window === 'undefined') return [];
+	try {
+		const stored = localStorage.getItem(STORAGE_KEY_FAVORITES);
+		return stored ? JSON.parse(stored) : [];
+	} catch {
+		return [];
+	}
+}
+
+export function getRecentApps(): RecentAppEntry[] {
+	if (typeof window === 'undefined') return [];
+	try {
+		const stored = localStorage.getItem(STORAGE_KEY_RECENT);
+		return stored ? JSON.parse(stored) : [];
+	} catch {
+		return [];
+	}
+}
+
+export function getUsageCounts(): Record<string, number> {
+	if (typeof window === 'undefined') return {};
+	try {
+		const stored = localStorage.getItem(STORAGE_KEY_USAGE);
+		return stored ? JSON.parse(stored) : {};
+	} catch {
+		return {};
+	}
+}
+
+export function toggleFavoriteApp(appId: string): void {
+	if (typeof window === 'undefined') return;
+	try {
+		const current = getFavoriteApps();
+		const index = current.indexOf(appId);
+		if (index >= 0) {
+			current.splice(index, 1);
+		} else {
+			current.push(appId);
+		}
+		localStorage.setItem(STORAGE_KEY_FAVORITES, JSON.stringify(current));
+	} catch {
+		// Ignore storage errors
+	}
+}
+
+export function recordAppVisit(appId: string): void {
+	if (typeof window === 'undefined') return;
+	try {
+		// Update recent apps
+		const recent = getRecentApps();
+		const filtered = recent.filter((r) => r.id !== appId);
+		const updated = [{ id: appId, timestamp: Date.now() }, ...filtered].slice(0, MAX_RECENT);
+		localStorage.setItem(STORAGE_KEY_RECENT, JSON.stringify(updated));
+
+		// Update usage counts
+		const counts = getUsageCounts();
+		counts[appId] = (counts[appId] || 0) + 1;
+		localStorage.setItem(STORAGE_KEY_USAGE, JSON.stringify(counts));
+	} catch {
+		// Ignore storage errors
+	}
+}
+
+export function clearRecentApps(): void {
+	if (typeof window === 'undefined') return;
+	try {
+		localStorage.removeItem(STORAGE_KEY_RECENT);
+	} catch {
+		// Ignore storage errors
+	}
+}
+
+// --- Reactive Svelte 5 store ---
+
+export function createAppNavigationStore() {
+	let favorites = $state<string[]>(getFavoriteApps());
+	let recentApps = $state<RecentAppEntry[]>(getRecentApps());
+	let usageCounts = $state<Record<string, number>>(getUsageCounts());
+
+	function refresh() {
+		favorites = getFavoriteApps();
+		recentApps = getRecentApps();
+		usageCounts = getUsageCounts();
+	}
+
+	function toggleFavorite(appId: string) {
+		toggleFavoriteApp(appId);
+		refresh();
+	}
+
+	function isFavorite(appId: string): boolean {
+		return favorites.includes(appId);
+	}
+
+	function visit(appId: string) {
+		recordAppVisit(appId);
+		refresh();
+	}
+
+	function clearRecent() {
+		clearRecentApps();
+		refresh();
+	}
+
+	return {
+		get favorites() {
+			return favorites;
+		},
+		get recentApps() {
+			return recentApps;
+		},
+		get usageCounts() {
+			return usageCounts;
+		},
+		toggleFavorite,
+		isFavorite,
+		recordAppVisit: visit,
+		clearRecent,
+		refresh,
+	};
+}