feat: Enhance sidebar navigation with collapsible sections and state management

- Added support for collapsible navigation sections in the sidebar, allowing users to expand or collapse sections based on their preferences.
- Integrated the collapsed state management into the app store for persistence across sessions.
- Updated the sidebar component to conditionally render the header based on the selected sidebar style.
- Ensured synchronization of collapsed section states with user settings for a consistent experience.

apps/ui/src/hooks/use-settings-migration.ts

@@ -699,6 +699,7 @@ export function hydrateStoreFromSettings(settings: GlobalSettings): void {
     fontFamilyMono: settings.fontFamilyMono ?? null,
     sidebarOpen: settings.sidebarOpen ?? true,
     sidebarStyle: settings.sidebarStyle ?? 'unified',
+    collapsedNavSections: settings.collapsedNavSections ?? {},
     chatHistoryOpen: settings.chatHistoryOpen ?? false,
     maxConcurrency: settings.maxConcurrency ?? DEFAULT_MAX_CONCURRENCY,
     autoModeByWorktree: restoredAutoModeByWorktree,