v1.3.0+4: FOSS Compliance + Dark Mode + Enhanced Settings

✨ Major Features:
- Dark mode toggle with app-wide theme switching
- Sort inventory by Expiration Date, Name, or Location
- Toggle between Grid and List view for inventory
- Export inventory data to CSV with share functionality
- Custom sage leaf app icon with adaptive icon support

🔄 FOSS Compliance (F-Droid Ready):
- Replaced Firebase with Supabase (open-source backend)
- Anonymous authentication (no user accounts required)
- Cloud-first with hosted Supabase as default
- Optional self-hosting support
- 100% FOSS-compliant dependencies

🎨 UI/UX Improvements:
- Dynamic version display from package.json (was hardcoded)
- Added edit buttons for household and user names
- Removed non-functional search button
- Replaced Recipes placeholder with Settings button
- Improved settings organization with clear sections

📦 Dependencies:
Added:
- supabase_flutter: ^2.8.4 (FOSS backend sync)
- package_info_plus: ^8.1.0 (dynamic version)
- csv: ^6.0.0 (data export)
- share_plus: ^10.1.2 (file sharing)
- image: ^4.5.4 (dev, icon generation)

Removed:
- firebase_core (replaced with Supabase)
- cloud_firestore (replaced with Supabase)

🗑️ Cleanup:
- Removed Firebase setup files and google-services.json
- Removed unimplemented features (Recipes, Search)
- Removed firebase_household_service.dart
- Removed inventory_sync_service.dart (replaced with Supabase)

📄 New Files:
- lib/features/household/services/supabase_household_service.dart
- web/privacy-policy.html (Play Store requirement)
- web/terms-of-service.html (Play Store requirement)
- PLAY_STORE_LISTING.md (marketing copy)
- tool/generate_icons.dart (icon generation script)
- assets/icon/sage_leaf.png (1024x1024)
- assets/icon/sage_leaf_foreground.png (adaptive icon)

🐛 Bug Fixes:
- Fixed version display showing hardcoded "1.0.0"
- Fixed Sort By and Default View showing static text
- Fixed ConsumerWidget build signatures
- Fixed Location.displayName import issues
- Added clearAllData method to Hive database

📊 Stats: +1,728 additions, -756 deletions across 42 files

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

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

lib/features/inventory/screens/inventory_screen.dart

@@ -17,14 +17,6 @@ class InventoryScreen extends ConsumerWidget {
     return Scaffold(
       appBar: AppBar(
         title: const Text('📦 Inventory'),
-        actions: [
-          IconButton(
-            icon: const Icon(Icons.search),
-            onPressed: () {
-              // TODO: Search functionality
-            },
-          ),
-        ],
       ),
       body: inventoryState.when(
         data: (items) {