feat: Support WebP image uploads, correct JPG MIME type, and refine professional rating display logic.

lib/features/home/presentation/widgets/top_professionals_section.dart

@@ -290,7 +290,8 @@ class _TopProfessionalsSectionState
     final experience = agent.experienceText;
     final locationText = agent.location;
     final subtitle = agent.agentType != null ? '(${agent.agentType!.name})' : '';
-    final rating = agent.averageRating ?? 5.0;
+    final rawRating = agent.averageRating ?? 0.0;
+    final rating = rawRating > 0 ? rawRating : 5.0;
 
     return Container(
         decoration: BoxDecoration(