feat(dashboard): complete React cutover

tests/web-auth-cutover.test.ts

@@ -110,10 +110,4 @@ describe('authenticated React dashboard cutover', () => {
     expect(upload.status).toBe(404);
   });
 
-  it('uses the legacy dashboard only when a React build is absent', async () => {
-    const running = await startServer({ includeReactBuild: false });
-    runningServers.push(running);
-    const response = await fetch(running.baseUrl, { headers: { Authorization: `Bearer ${AUTH_TOKEN}` } });
-    expect(await response.text()).toContain('Legacy dashboard');
-  });
 });