feat: basic test coverage

playwright.config.ts

@@ -35,6 +35,9 @@ const config: PlaywrightTestConfig = {
     port: 8080,
     timeout: 120 * 1000,
     reuseExistingServer: !process.env.CI,
+    env: {
+      COVERAGE: process.env.COVERAGE || 'false',
+    },
   },
 };