feat: Complete Phase 1 - Full Flutter app implementation with comprehensive features

Version: 1.1.0

Major changes:
- Implemented complete Flutter app structure with all core features
- Added comprehensive UI screens for auth, countdown, goals, profile, settings, and social features
- Integrated Supabase backend with authentication and data repositories
- Added offline support with Hive caching and local storage
- Implemented comprehensive routing with go_router
- Added location services with Google Maps integration
- Implemented notifications and home widget support
- Added voice recording capabilities and AI chat features
- Created comprehensive test suite and documentation
- Added Android and iOS platform configurations
- Implemented achievements system and social features
- Added calendar integration and bucket list functionality

This represents a complete Phase 1 milestone with 3,775 additions across 31 files.

lifetimer/lib/features/auth/presentation/auth_loading_screen.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart';
+import '../../../core/widgets/app_scaffold.dart';
+
+class AuthLoadingScreen extends StatelessWidget {
+  const AuthLoadingScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const AppScaffold(
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            CircularProgressIndicator(),
+            SizedBox(height: 16),
+            Text('Signing you in...'),
+          ],
+        ),
+      ),
+    );
+  }
+}