Fix Cocoa backend focus, close, live resize, popups and notifications

- Undecorated windows can become key and main; popups never take focus.
- Undecorated windows stay miniaturizable and resizable unless FIXED_SIZE.
- The close button sends a CLOSE request (windowShouldClose:) and does not
  close; the app destroys the surface to comply.
- Refresh runs during live resize: the modal flag is set between
  windowWillStartLiveResize: and windowDidEndLiveResize:, and CPU surfaces
  refresh before the frame is rendered. A destroyed window clears the flag.
- presentsWithTransaction is only changed for CPU presenters.
- Display open and surface creation return EPERM off the main thread.
- Popups are always CPU surfaces with a software queue, also under a Metal
  parent.
- Interactive move and drag start use the recorded mouse-down; without a
  press they set ESTALE. Interactive resize and window menu return ENOTSUP.
- Notifications: ENOTSUP outside an app bundle; one authorization request,
  notifications queued until it is granted, EACCES after a denial.
- Titles use the full string instead of a 159-byte copy that could split a
  UTF-8 sequence.
- finishLaunching runs once per process, not once per display open.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

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