New users can now be created with a password, which creates a real
Firebase Auth account (so they can log into the mobile app immediately)
alongside the Firestore profile document. UserCreate is now
UserProfile + password (request-only, never persisted or echoed back);
deleting a user also removes their Auth account.
- backend/users: split UserCreate into UserProfile (persisted shape)
and UserCreate (adds password), wire firebase_auth create/delete
- CreateUserModal: new lightweight modal for creating a user from
other flows (e.g. device onboarding) without leaving the page
- UserForm: adds the password field for new users; also fixes
useToast() being used undestructured (toast.success(...) was being
called on the hook's return value instead of its .toast method)
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
bonaminandClaude Sonnet 5
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