feat(web): prep-time intelligence, adaptive snooze, event countdown, TimerCard badges
- Prep time intelligence (lib/prep-time.ts): 12 keyword rules + 6 category defaults, prep/travel time suggestions, warning formatter, shouldShowPrepWarning() (22 tests)
- Adaptive snooze learning (lib/adaptive-snooze.ts): snooze pattern tracking, label normalization, suggestion engine with 5+ data point threshold, localStorage persistence (22 tests)
- Event countdown timer: createEvent factory with milestone warnings (30/7/3/1 days), addEvent store action, Event tab in CreateTimerModal with date picker
- TimerCard: category badge, chain link badge, prep time warning integration
- Analytics: added 'event' to trackTimerCreated type union
- Updated roadmap: marked prep time, adaptive snooze, event countdown, export/import, history as completed
- Phase 2 exit criteria: 6/10 met, 373 tests across 16 files, tsc clean
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