Unit tests:
- shares-service: create, idempotent create, revoke, get, batch fetch
- ip-rate-limit: under/over limit, IP independence, window reset
E2E tests:
- Create public share link via UI
- Public page renders without auth
- Revoke share returns 404
- Trashed note share returns 404
- Globe icon on shared card
- Copy link to clipboard
Also fix sharing-indicator test-id in existing sharing.spec.ts
and add shared_notes table to test-helpers and db/index.ts init.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
