feat(scanner): polish detection feedback and main collection behavior

- Replace noisy no-id snackbars with in-screen red status feedback
- Keep success state green and reduce interruption during scan flow
- Make scan-tab collection switching session-only (does not overwrite main)
- Keep main collection preselected from collections tab preference
- Apply recent UX text/layout polish for scan and detail actions

lib/main.dart

@@ -19,6 +19,9 @@ Future<void> main() async {
   await Supabase.initialize(
     url: _supabaseUrl,
     anonKey: _supabaseAnonKey,
+    authOptions: const FlutterAuthClientOptions(
+      authFlowType: AuthFlowType.implicit,
+    ),
   );
 
   runApp(const Car64App());
@@ -33,10 +36,18 @@ final scaffoldMessengerKey = GlobalKey<ScaffoldMessengerState>();
 
 /// Show a snackbar safely through the global key.
 void showGlobalSnackBar(String message, {bool isError = false}) {
-  scaffoldMessengerKey.currentState?.showSnackBar(
+  final messenger = scaffoldMessengerKey.currentState;
+  if (messenger == null) return;
+
+  messenger
+    ..hideCurrentSnackBar()
+    ..showSnackBar(
     SnackBar(
       content: Text(message),
       backgroundColor: isError ? Colors.red : null,
+      behavior: SnackBarBehavior.floating,
+      margin: const EdgeInsets.fromLTRB(16, 0, 16, 96),
+      duration: const Duration(seconds: 3),
     ),
   );
 }
@@ -78,6 +89,7 @@ class AuthGate extends StatefulWidget {
 
 class _AuthGateState extends State<AuthGate> {
   bool _isLoading = true;
+  bool _isInPasswordRecoveryFlow = false;
   Session? _session;
   String? _lastEnsuredUserId;
 
@@ -103,6 +115,7 @@ class _AuthGateState extends State<AuthGate> {
         _ensureDefaultCollectionIfNeeded();
 
         if (authState.event == AuthChangeEvent.passwordRecovery) {
+          setState(() => _isInPasswordRecoveryFlow = true);
           _showResetPasswordDialog();
         }
       },
@@ -132,6 +145,10 @@ class _AuthGateState extends State<AuthGate> {
       barrierDismissible: false,
       builder: (_) => const _ResetPasswordDialog(),
     );
+
+    if (mounted) {
+      setState(() => _isInPasswordRecoveryFlow = false);
+    }
   }
 
   @override
@@ -141,6 +158,7 @@ class _AuthGateState extends State<AuthGate> {
         body: Center(child: CircularProgressIndicator()),
       );
     }
+    if (_isInPasswordRecoveryFlow) return const LoginScreen();
     return _session != null ? const HomeShell() : const LoginScreen();
   }
 }

lib/scanner_screen.dart

@@ -37,6 +37,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
   bool _cameraReady = false;
   String? _lastDetected;
   bool _scanAccepted = false;
+  bool _scanNotFound = false;
   String _statusText = 'Ready to scan';
   String? _activeCollectionId;
   bool _autoScanEnabled = false;
@@ -96,6 +97,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
   void _toggleAutoScan() {
     setState(() {
       _autoScanEnabled = !_autoScanEnabled;
+      _scanNotFound = false;
       _statusText = _autoScanEnabled ? 'Auto scan enabled' : 'Auto scan paused';
     });
   }
@@ -106,6 +108,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
 
     setState(() {
       _isBusy = true;
+      _scanNotFound = false;
       _statusText = 'Scanning…';
     });
 
@@ -133,18 +136,11 @@ class _ScannerScreenState extends State<ScannerScreen> {
           await _submitDetected(found);
         }
       } else {
-        // Show all detected text so user knows what was seen.
+        setState(() {
-        final allText = recognized.blocks.map((b) => b.text).join('\n');
+          _scanAccepted = false;
-        ScaffoldMessenger.of(context).showSnackBar(
+          _scanNotFound = true;
-          SnackBar(
+          _statusText = 'No HW ID found';
-            content: Text(
+        });
-              allText.isEmpty
-                  ? 'No text detected — try again closer.'
-                  : 'No HW ID found. Detected:\n$allText',
-            ),
-            duration: const Duration(seconds: 4),
-          ),
-        );
       }
     } catch (e) {
       if (!mounted) return;
@@ -178,11 +174,17 @@ class _ScannerScreenState extends State<ScannerScreen> {
         setState(() {
           _lastDetected = null;
           _scanAccepted = true;
+          _scanNotFound = false;
           _statusText = 'Saved. Ready for next scan';
         });
         Future<void>.delayed(const Duration(milliseconds: 650), () {
           if (!mounted) return;
-          setState(() => _scanAccepted = false);
+          setState(() {
+            _scanAccepted = false;
+            if (_statusText == 'Saved. Ready for next scan') {
+              _statusText = 'Ready to scan';
+            }
+          });
         });
       } else {
         Navigator.of(context).pop();
@@ -253,6 +255,8 @@ class _ScannerScreenState extends State<ScannerScreen> {
             padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 8),
             color: _scanAccepted
                 ? AppColors.success.withValues(alpha: 0.12)
+                : _scanNotFound
+                    ? AppColors.error.withValues(alpha: 0.14)
                     : Colors.black.withValues(alpha: 0.55),
             child: Row(
               children: [
@@ -261,7 +265,11 @@ class _ScannerScreenState extends State<ScannerScreen> {
                     _statusText,
                     textAlign: TextAlign.center,
                     style: TextStyle(
-                      color: _scanAccepted ? AppColors.success : Colors.white,
+                      color: _scanAccepted
+                          ? AppColors.success
+                          : _scanNotFound
+                              ? AppColors.error
+                              : Colors.white,
                       fontSize: 12,
                       fontWeight: FontWeight.w600,
                     ),
@@ -308,6 +316,8 @@ class _ScannerScreenState extends State<ScannerScreen> {
                             border: Border.all(
                               color: (_scanAccepted
                                       ? AppColors.success
+                                      : _scanNotFound
+                                          ? AppColors.error
                                           : AppColors.orange)
                                   .withValues(alpha: 0.9),
                               width: 2.5,

lib/screens/collections_screen.dart

@@ -172,7 +172,7 @@ class CollectionsScreenState extends State<CollectionsScreen> {
     await prefs.setString(_activeCollectionPrefKey, collectionId);
     if (!mounted) return;
     setState(() => _activeCollectionId = collectionId);
-    showGlobalSnackBar('Active scan collection set.');
+    showGlobalSnackBar('Main collection set for scanning.');
   }
 
   @override
@@ -419,7 +419,7 @@ class _CollectionCard extends StatelessWidget {
                               borderRadius: BorderRadius.circular(6),
                             ),
                             child: const Text(
-                              'Active',
+                              'Main',
                               style: TextStyle(
                                 fontSize: 11,
                                 fontWeight: FontWeight.w600,
@@ -436,7 +436,9 @@ class _CollectionCard extends StatelessWidget {
               Column(
                 children: [
                   IconButton(
-                    tooltip: isActive ? 'Already active for scan' : 'Set active for scan',
+                    tooltip: isActive
+                        ? 'Already main collection'
+                        : 'Make main collection',
                     icon: Icon(
                       isActive ? Icons.my_location : Icons.location_searching,
                       color: isActive ? AppColors.success : AppColors.textHint,

lib/screens/garage_screen.dart

@@ -655,16 +655,21 @@ class GarageScreenState extends State<GarageScreen> {
                   child: ElevatedButton.icon(
                     onPressed: () => _editCar(car, context),
                     icon: const Icon(Icons.edit, size: 18),
-                    label: const Text('Edit Details'),
+                    label: const Text('Edit'),
                   ),
                 ),
-                const SizedBox(width: 8),
+              ],
-                Expanded(
+            ),
+            const SizedBox(height: 8),
+            SizedBox(
+              width: double.infinity,
               child: OutlinedButton.icon(
                 onPressed: () => _deleteCar(car, context),
                 icon: const Icon(Icons.delete_outline, color: AppColors.error),
-                    label: const Text('Remove',
+                label: const Text(
-                        style: TextStyle(color: AppColors.error)),
+                  'Remove',
+                  style: TextStyle(color: AppColors.error),
+                ),
                 style: OutlinedButton.styleFrom(
                   side: const BorderSide(color: AppColors.error),
                 ),
@@ -672,8 +677,6 @@ class GarageScreenState extends State<GarageScreen> {
             ),
           ],
         ),
-          ],
-        ),
       ),
     );
   }

lib/screens/home_shell.dart

@@ -15,8 +15,6 @@ class _HomeShellState extends State<HomeShell> {
   int _currentIndex = 0;
   final _collectionsKey = GlobalKey<CollectionsScreenState>();
   final _scanKey = GlobalKey<ScanTabState>();
-  final Map<int, DateTime> _lastRefreshed = {};
-  static const _refreshDebounce = Duration(seconds: 30);
 
   late final List<Widget> _pages = <Widget>[
     CollectionsScreen(key: _collectionsKey),
@@ -26,10 +24,7 @@ class _HomeShellState extends State<HomeShell> {
 
   void _onTabSelected(int i) {
     setState(() => _currentIndex = i);
-    final now = DateTime.now();
+
-    final last = _lastRefreshed[i];
-    if (last != null && now.difference(last) < _refreshDebounce) return;
-    _lastRefreshed[i] = now;
     if (i == 0) {
       _collectionsKey.currentState?.refresh();
     } else if (i == 1) {

lib/screens/login_screen.dart

@@ -76,7 +76,7 @@ class _LoginScreenState extends State<LoginScreen>
     try {
       await supabase.auth.resetPasswordForEmail(
         email,
-        redirectTo: 'hwcollector://login',
+        redirectTo: 'hwcollector://login/recovery',
       );
       showGlobalSnackBar('Password reset email sent! Check your inbox.');
     } on AuthException catch (e) {
@@ -134,12 +134,19 @@ class _LoginScreenState extends State<LoginScreen>
                               width: 2,
                             ),
                           ),
-                          child: const Icon(
+                          child: Padding(
+                            padding: const EdgeInsets.all(14),
+                            child: Image.asset(
+                              'assets/img/icon_bg_removed.png',
+                              fit: BoxFit.contain,
+                              errorBuilder: (context, error, stackTrace) => const Icon(
                                 Icons.directions_car_filled,
                                 size: 44,
                                 color: Colors.white,
                               ),
                             ),
+                          ),
+                        ),
                         const SizedBox(height: 16),
                         const Text(
                           'CAR64',

lib/screens/scan_tab.dart

@@ -156,7 +156,7 @@ class ScanTabState extends State<ScanTab> {
                               ))
                           .toList(),
                       onChanged: (id) {
-                        _setActiveCollection(id);
+                        _setSelectedCollection(id);
                       },
                     ),
                   ),
@@ -227,15 +227,12 @@ class ScanTabState extends State<ScanTab> {
     );
   }
 
-  Future<void> _setActiveCollection(String? id) async {
+  void _setSelectedCollection(String? id) {
     if (id == null) return;
     final matching = _collections.where((c) => c.id == id);
     if (matching.isEmpty) return;
 
     setState(() => _selectedCollection = matching.first);
-
-    final prefs = await SharedPreferences.getInstance();
-    await prefs.setString(_activeCollectionPrefKey, id);
   }
 
   Future<void> _openScanner() async {
@@ -244,7 +241,7 @@ class ScanTabState extends State<ScanTab> {
         builder: (_) => ScannerScreen(
           collections: _collections,
           activeCollectionId: _selectedCollection?.id,
-          onCollectionChanged: _setActiveCollection,
+          onCollectionChanged: _setSelectedCollection,
           onDetected: (hwId) => _processHwId(hwId),
         ),
       ),