fix(gateway-ui): refresh service worker and static cache headers

src/gateway/server.test.ts

@@ -295,6 +295,7 @@ describe('GatewayServer integration', () => {
     const res = await fetch(`http://127.0.0.1:${TEST_PORT}/`);
     expect(res.status).toBe(200);
     expect(res.headers.get('content-type')).toBe('text/html');
+    expect(res.headers.get('cache-control')).toBe('no-cache');
     const body = await res.text();
     expect(body).toContain('Flynn');
   });
@@ -308,6 +309,16 @@ describe('GatewayServer integration', () => {
     expect(res.headers.get('content-type')).toBe('text/css');
   });
 
+  it('serves sw.js with no-store cache policy', async () => {
+    if (!LISTEN_ALLOWED) {
+      return;
+    }
+    const res = await fetch(`http://127.0.0.1:${TEST_PORT}/sw.js`);
+    expect(res.status).toBe(200);
+    expect(res.headers.get('content-type')).toBe('application/javascript');
+    expect(res.headers.get('cache-control')).toBe('no-store');
+  });
+
   it('returns 404 for unknown HTTP path', async () => {
     if (!LISTEN_ALLOWED) {
       return;