Suppress expected console.error output in error-path tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/stores/files.test.js

@@ -215,9 +215,13 @@ describe("filesStore", () => {
     });
 
     it("returns early for invalid id without throwing", async () => {
+      const spy = vi.spyOn(console, "error").mockImplementation(() => {});
+
       await expect(store.deleteFile("log", null)).resolves.toBeUndefined();
 
       expect(mockDelete).not.toHaveBeenCalled();
+      expect(spy).toHaveBeenCalledWith("Delete File API Error: invalid id");
+      spy.mockRestore();
     });
   });