Refresh the list by extracting files from project_files where is_need_approval == true.
Scans project_files and updates ReviewFiles: - Extracts File objects from project_files where is_need_approval == true - Adds files not already in ReviewFiles - Removes files where is_need_approval == false or no longer in project_files - Emits items_changed signal when items are added/removed (via append/remove_at)