feat: Implement messaging functionality with conversation and chat screens, and enhance agent detail views.

lib/features/home/presentation/screens/home_screen.dart

@@ -150,7 +150,16 @@ class _HomeScreenState extends ConsumerState<HomeScreen> {
           context.push('/agents/search');
           return;
         }
-        if (index == 2 || index == 3) {
+        if (index == 2) {
+          final authState = ref.read(authProvider);
+          if (authState.status != AuthStatus.authenticated) {
+            context.push('/login');
+            return;
+          }
+          context.push('/messages');
+          return;
+        }
+        if (index == 3) {
           final authState = ref.read(authProvider);
           if (authState.status != AuthStatus.authenticated) {
             context.push('/login');