Function is_stub_command 

pub fn is_stub_command(cmd: &str) -> bool

List of commands that are stubbed (deferred to Phase 3+).

Cross-window drag commands: start_cross_drag, update_cross_drag, complete_cross_drag, cancel_cross_drag, set_drag_cursor, restore_drag_cursor, release_drag_capture, get_cursor_point, get_mouse_button_state, set_js_drag_active

Multi-window commands: open_new_window, list_windows, focus_window, open_window_at_position

Window effects: set_window_transparency

Legacy claude code stubs: open_claude_code_auth, get_claude_code_auth, disconnect_claude_code

Existing stubs (already unimplemented in Tauri): download_file, quicklook, update_wco, set_keyboard_chord_mode, create_workspace, switch_workspace, delete_workspace, set_active_tab, create_tab, close_tab

Update: install_update