fix(landing): drop top-level await so window.load handler binds in time

The earlier fix used `await import(...)` to defer prism-sql until after
window.Prism was assigned. Top-level await turned the inline module into an
asynchronous evaluation, which let `window.load` fire before the
`addEventListener("load", buildHeroGraph)` line ran — so on Pages the hero
ER graph never built and the canvas stayed blank with no console error.
Use fire-and-forget dynamic import; syntax highlighting can fail silently
without taking the hero down with it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ystemsrx

index.html

@@ -1962,9 +1962,12 @@ <h2 class="cta-title" data-i18n-html="cta_title">
       import * as Layout from "./src/layout";
 
       // prism-sql 在模块顶层引用全局 Prism；ESM 下 prismjs 不会自挂 window，
-      // 必须先把核心赋到全局，再用动态 import 让语言定义晚于赋值执行。
+      // 必须先把核心赋到全局，再动态 import 让语言定义晚于赋值执行。
+      // 不要用 top-level await：那会把整个模块变成异步求值，导致下方
+      // window.addEventListener("load", ...) 在 load 事件之后才注册，
+      // Hero ER 图永远不会被构建。代码高亮失败也不应阻塞主流程。
       window.Prism = Prism;
-      await import("prismjs/components/prism-sql");
+      import("prismjs/components/prism-sql").catch(() => {});
 
       // ───── YEAR ─────
       document.getElementById("year").textContent = new Date().getFullYear();