Update SignIn tests for registration-gated SSO buttons.

llm-fe/src/llm-fe/pages/SignIn/SignIn.test.tsx

@@ -79,10 +79,10 @@ describe('SignIn', () => {
     expect(await screen.findByRole('button', { name: /Don't have an account\? Sign up/i })).toBeInTheDocument();
   });
 
-  it('shows SSO buttons when oauth providers configured', async () => {
+  it('shows SSO buttons when registration enabled and oauth providers configured', async () => {
     mockGet.mockResolvedValue({
       data: {
-        enable_account_registration: false,
+        enable_account_registration: true,
         oauth: { google: true, microsoft: true },
       },
     });
@@ -92,10 +92,25 @@ describe('SignIn', () => {
     expect(screen.getByRole('button', { name: 'Sign in with Microsoft' })).toBeInTheDocument();
   });
 
-  it('hides SSO buttons when oauth not configured', async () => {
+  it('hides SSO buttons when registration disabled even if oauth configured', async () => {
     mockGet.mockResolvedValue({
       data: {
         enable_account_registration: false,
+        oauth: { google: true, microsoft: true },
+      },
+    });
+    renderSignIn();
+
+    await waitFor(() => {
+      expect(screen.queryByRole('button', { name: 'Continue with Google' })).not.toBeInTheDocument();
+      expect(screen.queryByRole('button', { name: 'Sign in with Microsoft' })).not.toBeInTheDocument();
+    });
+  });
+
+  it('hides SSO buttons when oauth not configured', async () => {
+    mockGet.mockResolvedValue({
+      data: {
+        enable_account_registration: true,
         oauth: { google: false, microsoft: false },
       },
     });