Add a system-wide hotkey to show and hide cmux windows - #2389

Bugbot Analysis Progress (6m 47s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (6m 34s)
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Final Result: Bugbot completed review - no new issues found! ✅

Request ID: serverGenReqId_b7502f9f-cf7d-4f1c-abdc-7d58ae0556c5