- setMainWindow on createWindow, setMainWindow(null) on closed
- attachRecoveryHandlers wires Electron unresponsive/crash/load-fail events
- Store subscriber drives tray context menu + macOS app menu + mode-gated
recovery-state-changed push to renderer; single applyMenusForState
function shared between subscriber and initial fire (no drift)
- Old hard-coded createTray Menu and macOS app-menu construction deleted;
Win/Linux Edit-only menu retained as one-time setup for keyboard accelerators
- requestQuit exported, wired via setOnQuitRequested callback
- Recovery IPC handlers: renderer-ready, recovery-action, get-recovery-state
- setAppUserModelId('com.backspace.desktop') for Win32 notification attribution
- Extended showNotification with optional onClick (existing 2-arg callers unchanged)