add event handler to avoid pyright issue

Author: masenf

chat/state.py

@@ -42,6 +42,15 @@ def create_chat(self, form_data: dict[str, Any]):
         self._chats[new_chat_name] = []
         self.is_modal_open = False
 
+    @rx.event
+    def set_is_modal_open(self, is_open: bool):
+        """Set the new chat modal open state.
+
+        Args:
+            is_open: Whether the modal is open.
+        """
+        self.is_modal_open = is_open
+
     @rx.var
     def selected_chat(self) -> list[QA]:
         """Get the list of questions and answers for the current chat.