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* feat(account): self-service login email change with double confirmation New POST /api/account/email requests the change via the user session so Supabase's AAL2 guard applies, and the account settings page gets an email row with pending-confirmation state. Confirmation mails (both addresses) and the /auth/callback email_change verification already existed; this wires the missing initiation. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018sbGMZQE5W7KfSVFjK7E4p * feat(account): map email_exists to a 409 with Swedish copy Changing to an address that already has an account is refused by GoTrue (addresses are unique per auth user); surface that as a clear conflict instead of the generic fallback. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018sbGMZQE5W7KfSVFjK7E4p * fix(account): trusted redirect origin + profiles.email sync trigger (skeptic findings) - emailRedirectTo now derives from resolveRequestAppOrigin(): request.url can be an internal origin behind a proxy (dead confirmation links on self-hosted) and auth links must not follow attacker-chosen hosts; registered white-label hosts keep their brand. - New migration 20260828191950: sync_profile_email trigger mirrors auth.users.email changes into profiles.email (member lists, notification recipients, AGI/KU contact, invite dedup all read profiles.email), plus a backfill for already-diverged rows. pg-real test included. - Save button disabled while the same address awaits confirmation (no rate-limit re-fires); GoTrue's 'error sending email change email' now maps to the Swedish SMTP guidance. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018sbGMZQE5W7KfSVFjK7E4p * fix(account): idempotent repeat request for the pending address CodeRabbit follow-up: a second POST for the address already awaiting confirmation now returns the pending state without another GoTrue round trip (no duplicate confirmation mails, no rate-limit burn). Claims-mapped sessions lack new_email; GoTrue's send rate limit remains the backstop. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018sbGMZQE5W7KfSVFjK7E4p --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>