feat: redesign header with logo bulge and room navigation

- Move room navigation from sidebar to top header bar as icons
- Add circular "bulge" extending below header for larger logo (120px)
- Logo centered in bulge with 20% circle below header line
- Profile dropdown with Settings and Logout options
- Header overlays content (Stack layout) instead of pushing it down
- Remove AppBar from FrontHallPage (provided by AppScaffold)
- Add transparent logo asset

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

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

lib/features/front_hall/presentation/pages/front_hall_page.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
-
-import '../../../../version.g.dart';
+import 'package:tatlock_ui/version.g.dart';
 
 /// Front Hall - estate overview and quick access.
 class FrontHallPage extends StatelessWidget {
@@ -10,19 +9,8 @@ class FrontHallPage extends StatelessWidget {
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
 
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Front Hall'),
-        actions: [
-          IconButton(
-            icon: const Icon(Icons.refresh),
-            onPressed: () {
-              // TODO: Refresh data
-            },
-          ),
-        ],
-      ),
-      body: ListView(
+    // No Scaffold/AppBar needed - header is provided by AppScaffold
+    return ListView(
         padding: const EdgeInsets.all(16),
         children: [
           // Welcome card
@@ -107,8 +95,7 @@ class FrontHallPage extends StatelessWidget {
             ),
           ),
         ],
-      ),
-    );
+      );
   }
 }