Media sends (photo/video/document/voice) are now opt-in per account via
the existing profiles.beta_features mechanism (migration 011 — same
pattern used to dogfood Flows before GA). No migration needed.
- New shared `hasBetaFeature` + `CHAT_MEDIA_BETA` ('chat_media') key, and
a `useBetaFeature` client hook mirroring useCan (false while loading).
- Composer: the attach menu, hidden file inputs, and voice recorder only
render when the flag is on; the hint indent reverts so non-beta users
see the unchanged text + template composer.
- Server: the send route rejects media kinds (403) and the transcode
route rejects (403) unless the caller's profile is opted in — so the
endpoints can't be driven ahead of the rollout. Text + templates stay
available to everyone.
Enable for one account via Supabase Studio:
UPDATE profiles SET beta_features = array_append(beta_features, 'chat_media')
WHERE email = 'someone@example.com';
Tests: hasBetaFeature null-safety + membership (419 total). typecheck/lint/build green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
