import assert from "node:assert/strict";import test from "node:test";import { highlightFenced, highlightLines } from "../src/features/agent/highlight-cache";import {  detectLang,  toolFilePath,  toolResultText,} from "../src/features/agent/ui/timeline/tool-metadata"; test("highlights code languages used by the filesystem and tool previews", () => {  const css = highlightFenced("css", "#panel { position: absolute; border: 1px solid #fff; }");  assert.match(css, /hljs-selector-id/);  assert.match(css, /hljs-attribute/);  assert.match(css, /hljs-number/);  assert.match(highlightFenced("java", "class Studio {}"), /hljs-keyword/);  assert.match(highlightFenced("toml", "port = 8080"), /hljs-attr/);}); test("preserves embedded language context across filesystem lines", () => {  const rendered = highlightLines("html", ["<style>", ".card { color: red; }", "</style>"]);  assert.equal(rendered.length, 3);  assert.match(rendered[1] ?? "", /language-css/);  assert.match(rendered[1] ?? "", /hljs-selector-class/);  for (const line of rendered) {    assert.equal(line.match(/<span/g)?.length ?? 0, line.match(/<\/span>/g)?.length ?? 0);  }}); test("infers source language for read tool previews", () => {  const block = {    kind: "tool" as const,    id: "read-1",    name: "read_file",    status: "done" as const,    text: "",    args: { path: "/tmp/panel.css" },  };  const path = toolFilePath(block);  assert.equal(path, "/tmp/panel.css");  assert.equal(detectLang(path), "css");  assert.match(highlightFenced(detectLang(path), "#panel { color: red; }"), /hljs-selector-id/);  assert.equal(toolResultText({ ...block, text: "import math", argsText: "{}" }), "import math");});