fix(frontend): clean test validation output

frontend/src/test/httpUtil.test.ts

@@ -35,6 +35,7 @@ const envelope = (data: unknown): HttpResponse => ({ ok: true, status: 200, stat
 describe('HttpUtil', () => {
   beforeEach(() => {
     vi.clearAllMocks();
+    vi.spyOn(console, 'error').mockImplementation(() => undefined);
   });
 
   it('unwraps a success envelope and shows a success toast', async () => {
@@ -80,6 +81,7 @@ describe('HttpUtil', () => {
 
     expect(msg.success).toBe(false);
     expect(msg.msg).toBe('bad input');
+    expect(console.error).not.toHaveBeenCalled();
   });
 
   it('maps a thrown native error to a failure Msg via its message', async () => {
@@ -88,6 +90,7 @@ describe('HttpUtil', () => {
     const msg = await HttpUtil.get('/x', undefined, { silent: true });
 
     expect(msg.msg).toBe('Network down');
+    expect(console.error).not.toHaveBeenCalled();
   });
 
   it('returns "No response data" for an empty body', async () => {