refactor: improve specialization card layout and unify chat screen header and navigation with home screen components.

lib/features/messaging/presentation/screens/conversations_screen.dart

@@ -52,16 +52,11 @@ class _ConversationsScreenState extends ConsumerState<ConversationsScreen> {
     final state = ref.watch(messagingProvider);
     final filtered = _filteredConversations(state.conversations);
 
-    return Scaffold(
-      backgroundColor: Colors.white,
-      body: SafeArea(
-        child: Column(
-          children: [
-            _buildHeader(),
-            Expanded(child: _buildConversationList(state, filtered)),
-          ],
-        ),
-      ),
+    return Column(
+      children: [
+        _buildHeader(),
+        Expanded(child: _buildConversationList(state, filtered)),
+      ],
     );
   }
 
@@ -317,12 +312,13 @@ class _ConversationsScreenState extends ConsumerState<ConversationsScreen> {
           return _ConversationTile(
             conversation: filtered[index],
             onTap: () =>
-                context.push('/messages/chat/${filtered[index].id}'),
+                context.go('/messages/chat/${filtered[index].id}'),
           );
         },
       ),
     );
   }
+
 }
 
 // -- Conversation Tile Widget --