docs: record frontend migration baseline

src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/smoke.test.mjs

@@ -6,7 +6,21 @@ import assert from "node:assert/strict";
 import test from "node:test";
 import { readFile } from "node:fs/promises";
 
+const indexPath = new URL("../../assets/web/index.html", import.meta.url);
+
 test("index loads the shared UI before the application", async () => {
-  const html = await readFile(new URL("../../assets/web/index.html", import.meta.url), "utf8");
+  const html = await readFile(indexPath, "utf8");
   assert.ok(html.indexOf("/ui-core.js") < html.indexOf("/app.js"));
 });
+
+test("startup has no remote script or stylesheet dependencies", async () => {
+  const html = await readFile(indexPath, "utf8");
+  const assetReferences = Array.from(
+    html.matchAll(/<(?:script|link)\b[^>]+(?:src|href)="([^"]+)"/g),
+    (match) => match[1],
+  );
+  assert.equal(
+    assetReferences.some((reference) => /^https?:\/\//i.test(reference)),
+    false,
+  );
+});