Auth

Magic code

Hook: useMagicCodeAuth.

1. db.auth.sendMagicCode({ email })
2. User enters 6 digits (CodeInputs / Base UI OTP)
3. db.auth.signInWithMagicCode({ email, code })

Edge cases:

• Verify only when length is exactly 6
• submitting ref blocks concurrent verifies
• Failures clear the code and trigger shake animation

Screens: Login.jsx, UpgradeDialog.jsx.

Guests

Landing GuestButton → db.auth.signInAsGuest(), then navigate to / when needed (e.g. from /home). Errors toast via global Toaster. Signed-in visitors on /home see “시간표 열기” instead of guest/login CTAs.

Guest users get a real Instant workspace. Upgrade dialog converts the guest to an email identity in place (Instant links the account; no local data migration).

Theme before auth

Landing uses local theme state because Instant settings are unavailable. After sign-in, useTheme takes over synced settings.