perf(images): lazy-load signed storage URLs for garage cards

lib/screens/garage_screen.dart

@@ -109,21 +109,11 @@ class GarageScreenState extends State<GarageScreen> {
           .range(from, to);
 
       final rows = List<Map<String, dynamic>>.from(data);
-      final withSignedUrls = await Future.wait(
-        rows.map((row) async {
-          final path = row['user_image_url'] as String?;
-          final signed = await StorageService.createSignedUrl(path);
-          return {
-            ...row,
-            'signed_image_url': signed,
-          };
-        }),
-      );
 
       if (!mounted) return;
       setState(() {
-        _cars = reset ? withSignedUrls : [..._cars, ...withSignedUrls];
+        _cars = reset ? rows : [..._cars, ...rows];
-        _hasMore = withSignedUrls.length == _pageSize;
+        _hasMore = rows.length == _pageSize;
         if (_hasMore) _page += 1;
         _isLoading = false;
         _isLoadingMore = false;
@@ -334,14 +324,19 @@ class GarageScreenState extends State<GarageScreen> {
                       color: global?['color'] as String?,
                       isVerified: global?['is_verified'] == true,
                       imageUrl: car['signed_image_url'] as String?,
+                      imagePath: car['user_image_url'] as String?,
                       isSelected: _selectedIds.contains(carId),
                       addedAt: car['created_at'] != null
                           ? DateTime.tryParse(car['created_at'])
                           : null,
                       onImageError: () => _refreshSignedUrlForCar(carId),
-                      onTap: () => _selectionMode
+                      onTap: () {
-                          ? _toggleCarSelection(car)
+                        if (_selectionMode) {
-                          : _showCarDetails(car),
+                          _toggleCarSelection(car);
+                        } else {
+                          _showCarDetails(car);
+                        }
+                      },
                       onLongPress:
                           widget.isViewer ? null : () => _toggleCarSelection(car),
                     );
@@ -557,7 +552,7 @@ class GarageScreenState extends State<GarageScreen> {
     }
   }
 
-  void _showCarDetails(Map<String, dynamic> car) {
+  Future<void> _showCarDetails(Map<String, dynamic> car) async {
     if (_selectionMode) {
       _toggleCarSelection(car);
       return;
@@ -571,7 +566,24 @@ class GarageScreenState extends State<GarageScreen> {
     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?;
+    String? imageUrl = car['signed_image_url'] as String?;
+    if (imageUrl == null || imageUrl.isEmpty) {
+      final path = car['user_image_url'] as String?;
+      final signed = await StorageService.createSignedUrl(path);
+      if (!mounted) return;
+      if (signed != null && signed.isNotEmpty) {
+        imageUrl = signed;
+        final index = _cars.indexWhere((c) => c['id'] == car['id']);
+        if (index != -1) {
+          setState(() {
+            _cars[index] = {
+              ..._cars[index],
+              'signed_image_url': signed,
+            };
+          });
+        }
+      }
+    }
 
     showModalBottomSheet(
       context: context,

lib/widgets/car_card.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:cached_network_image/cached_network_image.dart';
+import '../services/storage_service.dart';
 import '../theme/app_colors.dart';
 
 /// A styled card for displaying a single Hot Wheels car in the garage.
@@ -10,6 +11,7 @@ class CarCard extends StatelessWidget {
   final int? year;
   final String? color;
   final String? imageUrl;
+  final String? imagePath;
   final bool isVerified;
   final DateTime? addedAt;
   final VoidCallback? onTap;
@@ -25,6 +27,7 @@ class CarCard extends StatelessWidget {
     this.year,
     this.color,
     this.imageUrl,
+    this.imagePath,
     this.isVerified = false,
     this.addedAt,
     this.onTap,
@@ -37,6 +40,9 @@ class CarCard extends StatelessWidget {
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final isDark = theme.brightness == Brightness.dark;
+    final resolvedImageUrl = imageUrl;
+    final hasResolvedUrl = resolvedImageUrl != null && resolvedImageUrl.isNotEmpty;
+    final hasImagePath = imagePath != null && imagePath!.isNotEmpty;
 
     return Card(
       clipBehavior: Clip.antiAlias,
@@ -66,9 +72,9 @@ class CarCard extends StatelessWidget {
                         )
                       : AppColors.brandGradientSoft,
                 ),
-                child: imageUrl != null && imageUrl!.isNotEmpty
+                child: hasResolvedUrl
                     ? CachedNetworkImage(
-                        imageUrl: imageUrl!,
+                        imageUrl: resolvedImageUrl,
                         fit: BoxFit.cover,
                         fadeInDuration: Duration.zero,
                         fadeOutDuration: Duration.zero,
@@ -77,7 +83,27 @@ class CarCard extends StatelessWidget {
                           return _PlaceholderIcon(isDark: isDark);
                         },
                       )
-                    : _PlaceholderIcon(isDark: isDark),
+                    : hasImagePath
+                        ? FutureBuilder<String?>(
+                            future: StorageService.createSignedUrl(imagePath),
+                            builder: (context, snapshot) {
+                              final signedUrl = snapshot.data;
+                              if (signedUrl == null || signedUrl.isEmpty) {
+                                return _PlaceholderIcon(isDark: isDark);
+                              }
+                              return CachedNetworkImage(
+                                imageUrl: signedUrl,
+                                fit: BoxFit.cover,
+                                fadeInDuration: Duration.zero,
+                                fadeOutDuration: Duration.zero,
+                                errorWidget: (context, url, error) {
+                                  onImageError?.call();
+                                  return _PlaceholderIcon(isDark: isDark);
+                                },
+                              );
+                            },
+                          )
+                        : _PlaceholderIcon(isDark: isDark),
               ),
             ),