Wayland: fix GL thread races, reconnect ordering and sizing bugs

- GL swaps on a rendering thread no longer touch frame callbacks or
  presentation feedback. They set a per-surface flag and wake the loop; the
  owner thread arms both at its next flush and commits, so the frame callback
  fires without waiting for the application's next swap.
- Clear the offline flag only after the reconnect rebuild succeeds, and not
  when the connection was lost again during it.
- make_current fails with ENOTCONN for a window without a context. Detaching
  is a no-op when nothing is current or the EGL display is gone.
- Window move, resize, window menu and drag start need a pointer button or
  tablet tip that is still held; otherwise they fail with ESTALE and use that
  press's serial. Popups fail with ESTALE without an input serial and with
  ENOTCONN while the display is lost.
- An oversized device size shrinks to the buffer limits, keeping the aspect
  ratio, instead of closing the window.
- FIXED_SIZE windows pin xdg min and max on every set_size. The 64px minimum
  applies only to compositor-suggested sizes, not to application sizes.
- The keyboard-enter serial becomes the input serial. Clipboard copy with no
  keyboard focus fails with ESTALE.
- Relative-pointer windows relock after a reconnect rebuild.
- errno: EBUSY for an active drag, ENOTSUP for place_under_pointer and for GL
  without EGL, EINVAL for drag carry without a drag.
- Default window title and app ID are "YASL".
- Pointer motion and button events carry unrounded device-pixel positions in
  precise_x/precise_y with precise_position set.

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

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