Add Playwright e2e test setup and configs

app/assets/test/fixtures.ts

@@ -0,0 +1,28 @@
+/**
+ * Custom Playwright test fixtures.
+ *
+ * Provides a `test` function that connects to a remote Chrome via CDP
+ * when PLAYWRIGHT_CDP_URL is set (Docker Chrome mode).
+ * Falls back to the default local browser otherwise.
+ */
+
+import { test as base, chromium } from "@playwright/test";
+
+type Fixtures = {
+  // Browser is provided by Playwright Test by default.
+  // We only override it when connecting to remote Docker Chrome.
+};
+
+const cdpUrl = process.env.PLAYWRIGHT_CDP_URL;
+
+export const test = cdpUrl
+  ? base.extend<Fixtures>({
+      browser: async ({}, use) => {
+        const browser = await chromium.connectOverCDP(cdpUrl);
+        await use(browser);
+        await browser.close();
+      },
+    })
+  : base;
+
+export { expect } from "@playwright/test";