refactor: rename features to room-based directory structure

- Rename features/dashboard → features/front_hall
- Update routes: /, /control-room, /parlor, /settings
- Update navigation to 4 rooms (removed chat tab - will be omnipresent dock)
- Add docs/UI_LAYOUT.md with wireframes and responsive specs
- Update ARCHITECTURE.md and PLAN.md to reflect room structure

Directory structure now mirrors "Rooms of the Estate" UI navigation:
- front_hall/ (dashboard)
- control_room/ (infrastructure - containers, stacks, etc.)
- parlor/ (home automation)
- library/ (future)
- study/ (future, hidden)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/shared/layouts/app_scaffold.dart

@@ -12,29 +12,27 @@ class AppScaffold extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    // TODO: Replace AdaptiveScaffold with custom layout per UI_LAYOUT.md
+    // - Header with room tabs (not bottom/rail nav)
+    // - Chat dock on right side
     return AdaptiveScaffold(
       selectedIndex: _selectedIndex(context),
       onSelectedIndexChange: (index) => _onNavSelected(context, index),
       destinations: const [
         NavigationDestination(
-          icon: Icon(Icons.dashboard_outlined),
-          selectedIcon: Icon(Icons.dashboard),
-          label: 'Dashboard',
-        ),
-        NavigationDestination(
-          icon: Icon(Icons.chat_outlined),
-          selectedIcon: Icon(Icons.chat),
-          label: 'Tatlock',
+          icon: Icon(Icons.door_front_door_outlined),
+          selectedIcon: Icon(Icons.door_front_door),
+          label: 'Front Hall',
         ),
         NavigationDestination(
           icon: Icon(Icons.dns_outlined),
           selectedIcon: Icon(Icons.dns),
-          label: 'Containers',
+          label: 'Control Room',
         ),
         NavigationDestination(
-          icon: Icon(Icons.home_outlined),
-          selectedIcon: Icon(Icons.home),
-          label: 'Housekeeping',
+          icon: Icon(Icons.weekend_outlined),
+          selectedIcon: Icon(Icons.weekend),
+          label: 'Parlor',
         ),
         NavigationDestination(
           icon: Icon(Icons.settings_outlined),
@@ -51,21 +49,19 @@ class AppScaffold extends StatelessWidget {
   int _selectedIndex(BuildContext context) {
     final location = GoRouterState.of(context).matchedLocation;
 
-    if (location.startsWith(AppRoutes.containers)) return 2;
-    if (location.startsWith(AppRoutes.chat)) return 1;
-    if (location.startsWith(AppRoutes.housekeeping)) return 3;
-    if (location.startsWith(AppRoutes.settings)) return 4;
-    return 0; // Dashboard
+    if (location.startsWith(AppRoutes.controlRoom)) return 1;
+    if (location.startsWith(AppRoutes.parlor)) return 2;
+    if (location.startsWith(AppRoutes.settings)) return 3;
+    return 0; // Front Hall
   }
 
   void _onNavSelected(BuildContext context, int index) {
     final route = switch (index) {
-      0 => AppRoutes.dashboard,
-      1 => AppRoutes.chat,
-      2 => AppRoutes.containers,
-      3 => AppRoutes.housekeeping,
-      4 => AppRoutes.settings,
-      _ => AppRoutes.dashboard,
+      0 => AppRoutes.frontHall,
+      1 => AppRoutes.controlRoom,
+      2 => AppRoutes.parlor,
+      3 => AppRoutes.settings,
+      _ => AppRoutes.frontHall,
     };
     context.go(route);
   }