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The 👻 Ghost Tab Issue
Previous failure scenario (User perspective):
1. Open a new tab
2. Instantly trigger close other tabs
(eg. through custom user keyboard shortcut)
3. Now you will see an empty Ghost Tab
(Only a window bar with empty content)
The previous failure mode is:
1. Create a tab or window now in `newTab(...)` / `newWindow(...)`.
2. Queue its initial show/focus work with `DispatchQueue.main.async`.
3. Close that tab or window with `closeTabImmediately()` /
`closeWindowImmediately()` before the queued callback runs.
4. The queued callback still runs anyway and calls `showWindow(...)` /
`makeKeyAndOrderFront(...)` on stale state.
5. The tab can be resurrected as a half-closed blank ghost tab.
The fix:
- Store deferred presentation work in a cancellable
DispatchWorkItem and cancel it from the close paths
before AppKit finishes tearing down the tab or window.
- This prevents the stale show/focus callback from
running after close.