Service Workerが正しく登録できないのを修正

tests/staticAssets.test.js

@@ -0,0 +1,17 @@
+import { describe, expect, it } from 'vitest';
+import { createApp } from '../src/server/app.js';
+
+describe('static assets', () => {
+  it('serves the push service worker as JavaScript instead of the app shell', async () => {
+    const app = createApp();
+
+    const response = await app.request('/push-sw.js');
+    const body = await response.text();
+
+    expect(response.status).toBe(200);
+    expect(response.headers.get('content-type')).toContain('javascript');
+    expect(body).toContain("self.addEventListener('push'");
+    expect(body).toContain('showNotification');
+    expect(body).not.toContain('<div id="root">');
+  });
+});