Add comprehensive activity timeline view for the Spaxel dashboard:
- Timeline sidebar with scrollable chronological event list (newest first)
- Event types with distinct icons/colors: zone_entry/exit (green/orange),
portal_crossing (blue), anomaly/security_alert (red), learning_milestone (purple), system (grey)
- Each event shows: timestamp, description, person name, zone name
- Click event → jump to that moment in replay mode
- Filter bar: filter by person, zone, event type, time range (today/7d/30d)
- Search box with debounced text filter (300ms)
- Inline feedback (thumbs up/down) on presence detection events
- POST /api/feedback endpoint for feedback submission
- GET /api/events endpoint with pagination and filtering
- Live updates: 'event' messages from WebSocket feed
- New events prepend without layout shift using DOM insertion
- Loading states, empty state, and "load more" pagination
Acceptance criteria met:
- 200 events render within 200ms
- New events prepend without layout shift
- Clicking event seeks replay to that moment
- Feedback shows toast confirmation
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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