Auto-dismiss thread toasts after 10s of visible time

- Add `dismissAfterVisibleMs` support to thread toasts
- Pause/resume countdown based on tab visibility and window focus
- Set Git action result toasts to dismiss after 10s when visible
70752a0675Julius Marminge committed on 2/16/2026, 2:54:24 AMparent748ea2a
2 files changedLine totals unavailable