refactor: update back navigation to prioritize popping the route stack before defaulting to home

lib/features/agents/presentation/screens/agent_network_screen.dart

@@ -154,7 +154,13 @@ class AgentNetworkScreen extends ConsumerWidget {
       child: Row(
         children: [
           GestureDetector(
-            onTap: () => context.go('/home'),
+            onTap: () {
+              if (Navigator.of(context).canPop()) {
+                Navigator.of(context).pop();
+              } else {
+                context.go('/home');
+              }
+            },
             child: const Icon(
               Icons.arrow_back_ios_new_rounded,
               size: 18,

lib/features/agents/presentation/screens/agent_search_screen.dart

@@ -122,7 +122,13 @@ class _AgentSearchScreenState extends ConsumerState<AgentSearchScreen> {
         child: Row(
           children: [
             GestureDetector(
-              onTap: () => context.go('/home'),
+              onTap: () {
+                if (Navigator.of(context).canPop()) {
+                  Navigator.of(context).pop();
+                } else {
+                  context.go('/home');
+                }
+              },
               child: const Padding(
                 padding: EdgeInsets.only(right: 8),
                 child: Icon(

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

@@ -75,6 +75,8 @@ class _ConversationsScreenState extends ConsumerState<ConversationsScreen> {
                   _isSearchActive = false;
                   _searchController.clear();
                 });
+              } else if (Navigator.of(context).canPop()) {
+                Navigator.of(context).pop();
               } else {
                 context.go('/home');
               }