Add daily summary card with push notification option.
- Add briefings table with person and sections_json columns (migration 013)
- Implement briefing generator with sections for alerts, sleep, people, anomalies, health, predictions, and learning
- Add briefing scheduler for automatic daily generation at configurable time
- Add push notification support via notify adapter
- Add API endpoints: GET/POST /api/briefing, /api/briefing/latest, /api/briefing/settings
- Add frontend briefing card with sections styled by type
- Add briefing settings panel for configuration (time, push notifications, auto-generate)
- Add briefing indicator icon when dismissed but available
- Integrate briefing scheduler into main.go with providers
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
