feat(tracker): overdue command center with snooze/skip/pay + sidebar badge
- migration v0.70 adds snoozed_until TEXT to monthly_bill_state
- trackerService: snoozed_until in monthly state fetch + getOverdueCount()
- GET /api/tracker/overdue-count endpoint
- PUT /bills/:id/monthly-state validates snoozed_until
- OverdueCommandCenter component: collapsible, per-bill actions, hides snoozed
- useOverdueCount hook (2-min stale, 5-min poll, tab-only)
- Sidebar/nav uses overdue count badge on Tracker menu item
- Bump v0.33.8.7 → v0.34.0
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