Add unit tests for settings components and session hooks

- Implement comprehensive tests for `ProfileSettingsForm`, `PasswordChangeForm`, and `SessionCard` components to validate rendering, interactions, and state handling.
- Add tests for session management hooks (`useSession`, `useRevokeSession`, and `useRevokeAllOtherSessions`) to verify logic and API integration.
- Ensure coverage of edge cases, error handling, and success callbacks across all new tests.

frontend/src/components/auth/RegisterForm.tsx

@@ -98,6 +98,8 @@ export function RegisterForm({
 
   const form = useForm<RegisterFormData>({
     resolver: zodResolver(registerSchema),
+    mode: 'onBlur',
+    reValidateMode: 'onChange',
     defaultValues: {
       email: '',
       first_name: '',