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);
+  }
 }