test(e2e): 覆盖 5i 的字体加载/评论不误报/灯箱关闭/开源页动效（46→55 项）

新增九条断言，把本包修的四类回归固化成门禁：
- 字体真加载：技术轨文章的 document.fonts 必须含 LXGW WenKai Screen 与 WF-Hwmc
  （此前「class 在、计算值对、字体集里没有」是静默失效，只有这条能抓到）
- 评论不误报：进视口挂载后 #artalk-retry 必须保持 hidden，且容器打上 mounted 标记
- 灯箱关闭：点 #lb-close 后 dialog 必须变 closed（此前被右侧全高侧栏吃掉点击，
  表现是点了没反应，只能靠这条兜住）
- 开源页：零第三方外链图 + 打字机存在 + 数据板有自托管资产

验证: E2E_BASE=http://127.0.0.1:18934 node tests/e2e.mjs → 55/55 PASS

Spec: 2026-11-02_blog-5i-fonts-polish

Co-authored-by: GLM-5.3

tests/e2e.mjs

@@ -56,6 +56,50 @@ ok('5h·瞬间计数为只读模式', (await page.locator('.mom-cm-meta [data-vi
 await page.goto(BASE + '/about/', { waitUntil: 'networkidle' });
 ok('5h·关于页由块驱动', (await page.locator('[data-block]').count()) > 0, `blocks=${await page.locator('[data-block]').count()}`);
 
+// 0b) Phase 5i：字体真加载 / 评论不误报 / 灯箱关闭 / 开源页动效与数据板
+await page.goto(BASE + '/archives/writing-template/', { waitUntil: 'networkidle' });
+await page.waitForTimeout(2500);
+const fontState = await page.evaluate(() => {
+  const fams = [...new Set([...document.fonts].map((f) => f.family.replace(/"/g, '')))];
+  return {
+    kai: fams.includes('LXGW WenKai Screen'),
+    huiwen: fams.includes('WF-Hwmc'),
+    kaiFamily: getComputedStyle(document.querySelector('.font-kai')).fontFamily.split(',')[0].trim(),
+  };
+});
+ok('5i·字体真加载（楷体在字体集内）', fontState.kai, fontState.kaiFamily);
+ok('5i·汇文明朝按需加载', fontState.huiwen);
+await page.evaluate(() => {
+  const el = document.getElementById('artalk-container');
+  el?.scrollIntoView();
+});
+await page.waitForTimeout(3500);
+ok('5i·评论不误报（失败提示保持隐藏）', (await page.locator('#artalk-retry').getAttribute('hidden')) !== null);
+ok('5i·评论区已挂载', (await page.locator('#artalk-container[data-artalk-mounted="1"]').count()) === 1);
+
+await page.goto(BASE + '/gallery/', { waitUntil: 'networkidle' });
+await page.locator('.shot-btn').first().click();
+await page.waitForTimeout(400);
+ok('5i·灯箱可开', (await page.locator('#lb[open]').count()) === 1);
+await page.locator('#lb-close').click({ timeout: 5000 }).catch(() => {});
+await page.waitForTimeout(300);
+ok('5i·灯箱右上关闭真的能关', (await page.locator('#lb[open]').count()) === 0);
+
+await page.goto(BASE + '/opensource/', { waitUntil: 'networkidle' });
+const osState = await page.evaluate(() => {
+  const html = document.documentElement.outerHTML;
+  return {
+    thirdParty: ['img.shields.io', 'readme-typing-svg', 'github-readme-stats', 'streak-stats', 'komarev']
+      .some((u) => html.includes(u)),
+    typing: !!document.querySelector('[class*=typing]'),
+    board: document.querySelectorAll('.pf-card').length,
+    localAssets: [...document.querySelectorAll('img')].filter((i) => i.src.includes('/github-assets/')).length,
+  };
+});
+ok('5i·开源页零第三方外链图', !osState.thirdParty);
+ok('5i·打字机动效存在', osState.typing);
+ok('5i·数据板渲染', osState.board > 0 && osState.localAssets > 0, `cards=${osState.board} assets=${osState.localAssets}`);
+
 // 1) 明暗切换：按钮 + 状态持久 + t 键
 const before = await page.getAttribute('html', 'data-theme');
 await page.click('[data-theme-toggle]');