refine auto-reset timer cycle and pause on blur

Two follow-up refinements to the auto-reset timer added in 8da473a.

- Hotkey cycle now goes off -> 10s -> 30s -> 60s -> 2m -> 5m -> off,
  giving the user finer control between 60s and 5m and a quicker
  starting cadence.
- The timer now pauses while the TUI is blurred. SetFocused returns a
  tea.Cmd that re-arms a fresh tick on focus regain, and bumps the
  generation counter on every focus change so any tick scheduled before
  blur is dropped on arrival. autoResetTickCmd and handleAutoResetTick
  also gate on m.focused as defense in depth.
- Dashboard chrome shows 'auto-reset: 30s (paused)' while the timer is
  enabled but blurred, distinguishing it from the disabled 'off' state.

Tests cover the full preset cycle (including custom-value passthrough)
and the pause-on-blur lifecycle: stale ticks ignored, current-gen ticks
ignored while blurred, focus regain re-arms and fires the reset, no-op
focus calls don't churn the generation counter, and the chrome label
flips to '(paused)' as expected.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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