feat: Add optional agentTypeId field to RegisterRequest model.

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

@@ -50,9 +50,19 @@ class _HeroSectionState extends ConsumerState<HeroSection> {
     if (_selectedLocation != null) params['location'] = Uri.encodeComponent(_selectedLocation!);
     if (_selectedCategory != null) params['category'] = Uri.encodeComponent(_selectedCategory!);
 
+    if (params.isEmpty) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('Please select at least one filter to search'),
+          backgroundColor: AppColors.accentOrange,
+        ),
+      );
+      return;
+    }
+
     final queryString =
         params.entries.map((e) => '${e.key}=${e.value}').join('&');
-    context.push('/agents/search${queryString.isNotEmpty ? '?$queryString' : ''}');
+    context.push('/agents/search?$queryString');
   }
 
   Future<void> _showTypePicker() async {