feat: Implement image cache eviction for S3 images and enhance image loading error handling.

lib/core/utils/image_url_resolver.dart

@@ -1,4 +1,3 @@
-import 'package:dio/dio.dart';
 import 'package:real_estate_mobile/core/network/api_client.dart';
 
 /// Resolves S3 keys to presigned download URLs via the backend API.
@@ -54,10 +53,16 @@ class ImageUrlResolver {
         return data['url'] as String?;
       }
       return null;
-    } on DioException {
+    } catch (_) {
       return null;
     }
   }
 
   void clearCache() => _cache.clear();
+
+  /// Evict a single key from the in-memory cache so the next resolve
+  /// fetches a fresh presigned URL.
+  void evict(String? key) {
+    if (key != null) _cache.remove(key);
+  }
 }

lib/core/widgets/s3_image.dart

@@ -60,13 +60,17 @@ class _S3ImageState extends State<S3Image> {
       return;
     }
 
-    final url = await ImageUrlResolver.instance.resolve(widget.imageUrl);
-    if (mounted) {
-      setState(() {
-        _resolvedUrl = url;
-        _loading = false;
-        _failed = url == null;
-      });
+    try {
+      final url = await ImageUrlResolver.instance.resolve(widget.imageUrl);
+      if (mounted) {
+        setState(() {
+          _resolvedUrl = url;
+          _loading = false;
+          _failed = url == null;
+        });
+      }
+    } catch (_) {
+      if (mounted) setState(() { _loading = false; _failed = true; });
     }
   }
 
@@ -102,12 +106,13 @@ class _S3ImageState extends State<S3Image> {
 
     return CachedNetworkImage(
       imageUrl: _resolvedUrl!,
+      cacheKey: widget.imageUrl,
       width: widget.width,
       height: widget.height,
       fit: widget.fit,
       alignment: widget.alignment,
       placeholder: (ctx, _) => _buildPlaceholder(ctx),
-      errorWidget: (ctx, _, __) => _buildError(ctx),
+      errorWidget: (ctx, _, _) => _buildError(ctx),
     );
   }
 }