S06.7: fix frontend tests — remove legacy refresh expectations

dashboard/frontend/tests/unit/api.test.js

@@ -277,27 +277,19 @@ describe('API Client - Token Refresh', () => {
     expect(getToken()).toBe('new-token');
   });
 
-  it('should try legacy refresh token if cookie refresh fails', async () => {
+  it('should return false if cookie refresh fails (no legacy fallback)', async () => {
     localStorage.getItem.mockReturnValue('legacy-refresh-token');
 
-    // First call (cookie) fails
+    // Cookie refresh fails
     global.fetch.mockResolvedValueOnce({
       ok: false,
       status: 401,
     });
 
-    // Second call (legacy) succeeds
-    global.fetch.mockResolvedValueOnce({
-      ok: true,
-      status: 200,
-      json: async () => ({ access_token: 'new-token-from-legacy' }),
-    });
-
     const result = await tryRefreshSession();
 
-    expect(result).toBe(true);
-    expect(getToken()).toBe('new-token-from-legacy');
-    expect(localStorage.removeItem).toHaveBeenCalledWith('refresh_token');
+    expect(result).toBe(false);
+    expect(getToken()).toBe('');
   });
 
   it('should return false if all refresh attempts fail', async () => {