feat(acp+): models/providers in desktop on ACP+ (#9987)

ui/desktop/src/App.test.tsx

@@ -63,6 +63,15 @@ vi.mock('./sessions', () => ({
   createSession: vi.fn(),
 }));
 
+// Mock the ACP providers module used by OnboardingGuard so it doesn't try to
+// open a real ACP client connection during tests. Returning null defaults
+// keeps the app in the "brand new" (no provider configured) onboarding state.
+vi.mock('./acp/providers', () => ({
+  acpReadDefaults: vi.fn().mockResolvedValue({ providerId: null, modelId: null }),
+  acpSaveDefaults: vi.fn().mockResolvedValue(undefined),
+  acpListProviderDetails: vi.fn().mockResolvedValue([]),
+}));
+
 // Mock the ConfigContext module
 vi.mock('./components/ConfigContext', () => ({
   useConfig: () => ({