fix(export): Shiki 语言包改字面量动态导入，修复打包警告与加载风险

src/services/exportHtml.ts

@@ -243,6 +243,34 @@ const EXPORT_LANGS = [
   'csharp', 'sql', 'yaml', 'xml', 'diff', 'ini',
 ] as const
 
+/** 每个语言用字面量 import 声明：模板拼接的 import(`.../${name}`) Vite 无法分析，
+ * 打包后会原样保留裸模块说明符导致高亮加载失败；字面量写法可正常分块、按需加载。 */
+const LANG_LOADERS: Record<(typeof EXPORT_LANGS)[number], () => Promise<{ default: import('@shikijs/types').LanguageRegistration[] }>> = {
+  javascript: () => import('@shikijs/langs/javascript'),
+  typescript: () => import('@shikijs/langs/typescript'),
+  tsx: () => import('@shikijs/langs/tsx'),
+  jsx: () => import('@shikijs/langs/jsx'),
+  json: () => import('@shikijs/langs/json'),
+  html: () => import('@shikijs/langs/html'),
+  css: () => import('@shikijs/langs/css'),
+  markdown: () => import('@shikijs/langs/markdown'),
+  bash: () => import('@shikijs/langs/bash'),
+  shell: () => import('@shikijs/langs/shell'),
+  powershell: () => import('@shikijs/langs/powershell'),
+  python: () => import('@shikijs/langs/python'),
+  java: () => import('@shikijs/langs/java'),
+  go: () => import('@shikijs/langs/go'),
+  rust: () => import('@shikijs/langs/rust'),
+  c: () => import('@shikijs/langs/c'),
+  cpp: () => import('@shikijs/langs/cpp'),
+  csharp: () => import('@shikijs/langs/csharp'),
+  sql: () => import('@shikijs/langs/sql'),
+  yaml: () => import('@shikijs/langs/yaml'),
+  xml: () => import('@shikijs/langs/xml'),
+  diff: () => import('@shikijs/langs/diff'),
+  ini: () => import('@shikijs/langs/ini'),
+}
+
 /**
  * Shiki 高亮器：用 core + JavaScript 正则引擎（不用 Oniguruma WASM——
  * WASM 加载依赖 fetch/stream，在部分 WebView/测试环境会失败，JS 引擎 everywhere 可用）。
@@ -254,7 +282,7 @@ function loadHighlighter(): Promise<import('shiki').HighlighterCore> {
       const { createJavaScriptRegexEngine } = await import('shiki/engine/javascript')
       const theme = (await import('@shikijs/themes/github-light')).default
       const langs = await Promise.all(
-        EXPORT_LANGS.map(async (name) => (await import(`@shikijs/langs/${name}`)).default),
+        EXPORT_LANGS.map(async (name) => (await LANG_LOADERS[name]()).default),
       )
       return createHighlighterCore({
         themes: [theme],