Finish the i18n pass: settings panels (profile/care-team/signing), the
chat heading + input, the patient cards / detail / create-edit form, and
the notes page + rich-text editor are all keyed in en/translation.json.
All 526 static t() keys resolve. Document the new backend resources +
Socket.io realtime (backend README/CLAUDE) and the i18n coverage
(frontend CLAUDE).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>