After Supabase auth succeeds the store calls POST /api/devices/check-lock
(x-device-id auto-attached via apiFetch). A 409 DEVICE_LOCKED response
triggers a Supabase sign-out and returns { deviceLocked } instead of
proceeding. The signin screen swaps to DeviceLockedPanel which shows:
- lock icon + headline + explanatory body
- amber countdown badge if a release is already in progress
- grey hint pointing to the email notification
- primary CTA to go back and sign in with the original account
Backend TODO: POST /api/devices/check-lock endpoint — same device-lock
query as login.post.ts but callable with a valid Supabase session token
(for email-login flow that bypasses /api/auth/login).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
0d073b398f