WhatsApp notice:
- Was: Ugly amber warning box with margins, breaking layout flow
- Now: Thin edge-to-edge midnight strip below header, same design
language as the header itself. Green WhatsApp icon, 'Set up →' link,
subtle × dismiss. Zero layout disruption.
Collect quick-add:
- Was: 'New link' always added to events[0] with no choice
- Now: Multi-appeal orgs see appeal picker buttons. Single-appeal orgs
see appeal name as subtle label. Quick-add panel has blue border
treatment matching brand.
- Removed unused AlertTriangle import
