GLFW's applicationShouldTerminate: converts all quit paths (Cmd+Q, dock,
menu bar) into window close requests and returns NSTerminateCancel, so our
close-to-hide intercept was hiding the window instead of letting the app exit.
Fix by implementing applicationShouldTerminate: in ReopenDelegate, setting a
darwinQuitting flag before forwarding to GLFW's delegate. The close intercept
checks this flag and calls Window.Close() instead of Hide() when quitting.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
