refactor: update navigation to use push/pop and add conditional dashboard redirection for agents

lib/features/about/presentation/screens/about_screen.dart

@@ -847,7 +847,9 @@ class AboutScreen extends ConsumerWidget {
             ),
             alignment: Alignment.center,
             child: Text(
-              cta.buttonText,
+              (ref.read(authProvider).user?.role == 'AGENT')
+                  ? 'Go to Dashboard'
+                  : cta.buttonText,
               style: const TextStyle(
                 fontFamily: 'Fractul',
                 fontSize: 16,

lib/features/contact/presentation/screens/contact_screen.dart

@@ -613,8 +613,10 @@ class _ContactScreenState extends State<ContactScreen> {
               child: Row(
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: [
-                  const Text(
-                    'Start Your Search',
+                  Text(
+                    (ref.read(authProvider).user?.role == 'AGENT')
+                        ? 'Go to Dashboard'
+                        : 'Start Your Search',
                     style: TextStyle(
                       fontFamily: 'Fractul',
                       fontSize: 16,

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

@@ -193,7 +193,13 @@ class _ChatScreenState extends ConsumerState<ChatScreen>
           onConfirm: () async {
             final notifier = ref.read(messagingProvider.notifier);
             await notifier.deleteConversation(widget.conversationId);
-            if (mounted) context.go('/messages');
+            if (mounted) {
+              if (Navigator.of(context).canPop()) {
+                Navigator.of(context).pop();
+              } else {
+                context.go('/messages');
+              }
+            }
           },
           isDanger: true,
         );
@@ -266,9 +272,14 @@ class _ChatScreenState extends ConsumerState<ChatScreen>
   }
 
   void _handleBack() {
-    ref.read(messagingProvider.notifier).setActiveConversation(null);
+    final notifier = ref.read(messagingProvider.notifier);
+    Future.microtask(() => notifier.setActiveConversation(null));
+    if (Navigator.of(context).canPop()) {
+      Navigator.of(context).pop();
+    } else {
       context.go('/messages');
     }
+  }
 
   // ============================================================
   // DATE / TIME FORMATTING

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

@@ -434,7 +434,7 @@ class _ConversationsScreenState extends ConsumerState<ConversationsScreen> {
           return _ConversationTile(
             conversation: filtered[index],
             onTap: () =>
-                context.go('/messages/chat/${filtered[index].id}'),
+                context.push('/messages/chat/${filtered[index].id}'),
           );
         },
       ),