Suppress expected console.error output in error-path tests

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

tests/stores/login.test.js

@@ -147,11 +147,14 @@ describe("loginStore", () => {
     });
 
     it("sets isInvalid on error", async () => {
+      const spy = vi.spyOn(console, "error").mockImplementation(() => {});
       axios.post.mockRejectedValue(new Error("401"));
 
       await store.signIn();
 
       expect(store.isInvalid).toBe(true);
+      expect(spy).toHaveBeenCalledWith("Login failed:", expect.any(Error));
+      spy.mockRestore();
     });
   });
 
@@ -197,11 +200,14 @@ describe("loginStore", () => {
     });
 
     it("redirects to login on error", async () => {
+      const spy = vi.spyOn(console, "error").mockImplementation(() => {});
       mockClientGet.mockRejectedValue(new Error("401"));
 
       await store.checkLogin();
 
       expect(store.$router.push).toHaveBeenCalledWith("/login");
+      expect(spy).toHaveBeenCalledWith("Session check failed:", expect.any(Error));
+      spy.mockRestore();
     });
   });