X11: survive server loss, chain X errors, fix popups and pointer requests

- Losing the X server queues DISPLAY_LOST instead of exiting. A process-wide
  IO error handler returns for YASL displays, so Xlib calls the per-display
  exit handler and returns; later waits fail with ENOTCONN, and dispatch and
  flush make no Xlib calls on a lost display.
- Errors on other displays chain to the previous handler, restored when the
  last YASL display closes.
- MIT-SHM attach is synced; a refused attach detaches and falls back to
  XPutImage. Shared images are used only for 32-bit TrueColor 0xAARRGGBB.
- Undecorated windows set MWM_HINTS_DECORATIONS and leave functions alone.
- Fixed-size windows keep their min/max hints in step with set_size.
- Swap interval is stored per surface and applied when it becomes current;
  gl_make_current(NULL) without EGL succeeds as a no-op.
- XInitThreads runs before the first connection.
- Move, resize, window menu, drag start and place-under-pointer need a held
  pointer button (ESTALE). Move and resize also need _NET_WM_MOVERESIZE on
  the root (ENOTSUP) and send the held button.
- _GTK_SHOW_WINDOW_MENU carries the XI2 client pointer and root coordinates.
- Popups always present through CPU and grab the pointer (XI2 device grab
  when available); a press outside every YASL window closes the topmost popup.
- Drag start while active returns EBUSY; drag carry without a drag EINVAL.

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

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