fix: improve chat message deduplication, add conversation refresh logic, and update UI components for consistency

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

@@ -1651,12 +1651,13 @@ class _AgentEditProfileScreenState
 
     await showModalBottomSheet<void>(
       context: context,
+      useRootNavigator: true,
       isScrollControlled: true,
       backgroundColor: Colors.white,
       shape: const RoundedRectangleBorder(
         borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
       ),
-      builder: (ctx) {
+      builder: (sheetCtx) {
         return StatefulBuilder(
           builder: (ctx, setSheetState) {
             final filtered = options.where((o) {
@@ -1754,7 +1755,7 @@ class _AgentEditProfileScreenState
                             Expanded(
                               child: OutlinedButton(
                                 onPressed: () =>
-                                    Navigator.pop(ctx),
+                                    Navigator.of(ctx).pop(),
                                 style: OutlinedButton.styleFrom(
                                   padding:
                                       const EdgeInsets.symmetric(
@@ -1772,7 +1773,7 @@ class _AgentEditProfileScreenState
                               child: ElevatedButton(
                                 onPressed: () {
                                   onChanged(workingSelected);
-                                  Navigator.pop(ctx);
+                                  Navigator.of(ctx).pop();
                                 },
                                 style: ElevatedButton.styleFrom(
                                   backgroundColor: