Shorten temp directory (#17901)

packages/cli/src/gemini_cleanup.test.tsx

@@ -38,6 +38,10 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
     disableMouseEvents: vi.fn(),
     enterAlternateScreen: vi.fn(),
     disableLineWrapping: vi.fn(),
+    ProjectRegistry: vi.fn().mockImplementation(() => ({
+      initialize: vi.fn(),
+      getShortId: vi.fn().mockReturnValue('project-slug'),
+    })),
   };
 });