fix(desktop): prevent quit shortcut spillover

[Bil0000]

Problem

Holding Cmd+Q could close T3 while the shortcut was still repeating, so the next macOS app could receive the same quit shortcut. Turning Hold to quit off also still emitted the hold overlay state before the setting check finished.

Fix

• Complete the hold first, then wait for a safe key release before exiting.
• If Cmd is released before Q, keep T3 alive, consume Q repeats, and quit after Q is released or a quiet release grace period.
• Send hold overlay state only after Hold to quit is confirmed enabled.

Tests

• 37 focused desktop tests passed.
• Desktop typecheck passed.
• Targeted lint and format checks passed.

Fixes #7369

[coderabbitai]

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[macroscopeapp]

Approvability

Verdict: Approved at c9e780a

Macroscope's review found this PR approvable — Self-contained bug fix to the hold-to-quit keyboard shortcut handling. The change makes quitting wait for key release after the hold threshold to prevent key repeats from spilling over to the next focused app. The author created this module and the fix includes comprehensive test coverage.

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