refactor: use system timezone and harden client APIs

tests/helpers/fake_tdclient_impl.rs

@@ -313,11 +313,11 @@ impl TdClientTrait for FakeTdClient {
         // Not implemented
     }
 
-    fn pending_view_messages_mut(&mut self) -> &mut Vec<(ChatId, Vec<MessageId>)> {
-        // WORKAROUND: Возвращаем мутабельную ссылку через leak
-        // Это безопасно так как мы единственные владельцы &mut self
-        let guard = self.pending_view_messages.lock().unwrap();
-        unsafe { &mut *(guard.as_ptr() as *mut Vec<(ChatId, Vec<MessageId>)>) }
+    fn enqueue_pending_view_messages(&mut self, chat_id: ChatId, message_ids: Vec<MessageId>) {
+        self.pending_view_messages
+            .lock()
+            .unwrap()
+            .push((chat_id, message_ids));
     }
 
     fn pending_user_ids_mut(&mut self) -> &mut Vec<UserId> {
@@ -333,6 +333,10 @@ impl TdClientTrait for FakeTdClient {
     }
 
     // ============ Notification methods ============
+    fn configure_notifications(&mut self, _config: &tele_tui::config::NotificationsConfig) {
+        // Not implemented for fake client (notifications are not tested)
+    }
+
     fn sync_notification_muted_chats(&mut self) {
         // Not implemented for fake client (notifications are not tested)
     }