feat(validation): add garage-side community confirmation action

lib/screens/garage_screen.dart

@@ -93,7 +93,7 @@ class GarageScreenState extends State<GarageScreen> {
       final data = await supabase
           .from('hotwheels')
           .select(
-              'id, created_at, hw_id, notes, user_image_url, global_cars(name, series, year, color)')
+            'id, created_at, hw_id, notes, user_image_url, global_cars(name, series, year, color, is_verified, confirmation_count)')
           .eq('collection_id', widget.collectionId)
           .order('created_at', ascending: false)
           .range(from, to);
@@ -476,6 +476,8 @@ class GarageScreenState extends State<GarageScreen> {
     final name = global?['name'] as String?;
     final series = global?['series'] as String?;
     final year = global?['year'] as int?;
+    final verified = global?['is_verified'] == true;
+    final confirmations = (global?['confirmation_count'] as num?)?.toInt() ?? 0;
     final notes = car['notes'] as String?;
     final imageUrl = car['signed_image_url'] as String?;
 
@@ -597,11 +599,35 @@ class GarageScreenState extends State<GarageScreen> {
               _DetailRow(icon: Icons.collections, label: 'Series', value: series),
             if (year != null)
               _DetailRow(icon: Icons.calendar_today, label: 'Year', value: '$year'),
+            _DetailRow(
+              icon: verified ? Icons.verified : Icons.hourglass_bottom,
+              label: 'Validation',
+              value: verified
+                  ? 'Verified by community'
+                  : 'Pending verification',
+            ),
+            _DetailRow(
+              icon: Icons.how_to_vote,
+              label: 'Confirmations',
+              value: '$confirmations',
+            ),
             if (notes != null && notes.isNotEmpty)
               _DetailRow(icon: Icons.notes, label: 'Notes', value: notes),
 
             const SizedBox(height: 24),
 
+            if (!verified) ...[
+              SizedBox(
+                width: double.infinity,
+                child: OutlinedButton.icon(
+                  onPressed: () => _confirmCatalogEntry(hwId, context),
+                  icon: const Icon(Icons.thumb_up_alt_outlined, size: 18),
+                  label: const Text('Confirm Catalog Entry'),
+                ),
+              ),
+              const SizedBox(height: 10),
+            ],
+
             // Edit & Delete buttons
             Row(
               children: [
@@ -730,6 +756,36 @@ class GarageScreenState extends State<GarageScreen> {
     }
   }
 
+  Future<void> _confirmCatalogEntry(String hwId, BuildContext sheetContext) async {
+    final user = supabase.auth.currentUser;
+    if (user == null) return;
+
+    try {
+      final existingVote = await supabase
+          .from('car_votes')
+          .select('id')
+          .eq('hw_id', hwId)
+          .eq('user_id', user.id)
+          .maybeSingle();
+
+      if (existingVote != null) {
+        showGlobalSnackBar('You already confirmed this catalog entry.');
+        return;
+      }
+
+      await supabase.from('car_votes').insert({
+        'hw_id': hwId,
+        'user_id': user.id,
+      });
+
+      showGlobalSnackBar('Thanks! Your validation vote was recorded.');
+      if (sheetContext.mounted) Navigator.pop(sheetContext);
+      _loadCars(reset: true);
+    } catch (e) {
+      showGlobalSnackBar('Failed to submit validation vote: $e', isError: true);
+    }
+  }
+
   Future<String?> _pickTargetCollection() async {
     final collections = await CollectionService.getMyCollections();
     if (!mounted) return null;