test(ui): verify storybook light theme

tests/e2e/storybook-server.ts

@@ -0,0 +1,33 @@
+import { existsSync } from "node:fs";
+import { resolve, sep } from "node:path";
+
+const root = resolve(process.cwd(), "storybook-static");
+const port = Number(process.env.STORYBOOK_STATIC_PORT || 6007);
+
+if (!existsSync(resolve(root, "iframe.html"))) {
+  throw new Error("storybook-static is missing. Run bun run build-storybook first.");
+}
+
+Bun.serve({
+  hostname: "127.0.0.1",
+  port,
+  async fetch(request) {
+    const url = new URL(request.url);
+    const pathname = decodeURIComponent(url.pathname);
+    const relativePath = pathname === "/" ? "/index.html" : pathname;
+    const filePath = resolve(root, `.${relativePath}`);
+
+    if (!filePath.startsWith(`${root}${sep}`)) {
+      return new Response("Forbidden", { status: 403 });
+    }
+
+    const file = Bun.file(filePath);
+    if (!(await file.exists())) {
+      return new Response("Not found", { status: 404 });
+    }
+
+    return new Response(file);
+  },
+});
+
+console.log(`Storybook static listening on http://127.0.0.1:${port}`);