[MA-639] Fix TGPT chat history

lib/core/providers/user.dart

@@ -259,15 +259,17 @@ class UserDataProvider extends ChangeNotifier {
   /// Logs out user
   /// Unregisters device from direct push notification using [_pushNotificationDataProvider]
   /// Resets all [AuthenticationModel] and [UserProfileModel] data from persistent storage
-  void logout() async {
+  /// [clearChatHistory] must be true to delete local TGPT chat history; pass true only from
+  /// the explicit user-initiated logout action, not from automated auth-refresh paths.
+  void logout({bool clearChatHistory = false}) async {
     _error = null;
     _isLoading = true;
     notifyListeners();
     resetHomeScrollOffset();
     resetAllCardHeights();
     resetNotificationsScrollOffset();
     _pushNotificationDataProvider.unregisterDevice(_authenticationModel.accessToken);
-    await _chatPersistenceService.clearUserChatData();
+    if (clearChatHistory) await _chatPersistenceService.clearUserChatData();
     updateAuthenticationModel(AuthenticationModel.fromJson({}));
     updateUserProfileModel(await _createNewUser(UserProfileModel.fromJson({})));
     _deletePasswordFromDevice();

lib/ui/navigator/bottom.dart

@@ -133,6 +133,9 @@ class _BottomTabBarState extends State<BottomTabBar> {
   }
 
   Widget _buildAIAssistantIcon(bool isSelected, ThemeData theme) {
+    final iconAsset =
+        isSelected ? 'assets/images/tgpt/center-icon2.png' : 'assets/images/tgpt/center-icon2-unselected.png';
+
     return Container(
       height: 34,
       margin: const EdgeInsets.only(top: 4),
@@ -142,13 +145,10 @@ class _BottomTabBarState extends State<BottomTabBar> {
         borderRadius: BorderRadius.circular(34),
       ),
       child: Image.asset(
-        'assets/images/tgpt/center-icon2.png',
+        iconAsset,
         width: 34,
         height: 34,
-        color: isSelected
-            ? theme.bottomNavigationBarTheme.selectedItemColor
-            : theme.bottomNavigationBarTheme.unselectedItemColor,
-        colorBlendMode: BlendMode.srcIn,
+        filterQuality: FilterQuality.high,
       ),
     );
   }

lib/ui/profile/login.dart

@@ -104,7 +104,7 @@ class _LoginState extends State<Login> {
   void executeLogout() {
     _passwordTextFieldController.clear();
     _emailTextFieldController.clear();
-    _userDataProvider.logout();
+    _userDataProvider.logout(clearChatHistory: true);
   }
 
   Widget buildLoginWidget() {