The GET /api/notifications/preview endpoint was already implemented
in internal/api/notifications.go but was never registered in main.go.
This commit wires up the NotificationsHandler to enable the test
thumbnail endpoint for UI development and QA.
The endpoint accepts query parameters:
- type: notification type (fall, anomaly, zone_enter, sleep)
- person: person name (optional, defaults to "Alice")
It calls the appropriate Generate*Thumbnail function from the
render package and returns PNG bytes with Content-Type: image/png.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
37571ece97