Module handler 

Application event handler

This module implements the winit ApplicationHandler trait for WindowManager, routing window events to the appropriate WindowState and handling menu events.

Sub-modules

• window_state_impl: impl WindowState — shell integration, window event routing, focus change, and per-frame about_to_wait polling.
• app_handler_impl: impl ApplicationHandler for WindowManager — winit event loop entry points (resumed, window_event, about_to_wait).
• wake: folds every window’s desired wake cadence into the single ControlFlow the event loop can hold.