fix(docs): [SITE-LOAD-01] serialize example loading and preserve navigation

packages/artplayer-vitepress/browser/editor-loader.ts

@@ -0,0 +1,8 @@
+import { createLibraryLoader, exampleSource, parameters } from './loader.ts'
+
+const loader = createLibraryLoader()
+Object.assign(window, { ArtplayerDocsLoader: { ...loader, exampleSource, parameters } })
+window.addEventListener('pagehide', (event) => {
+  if (!event.persisted)
+    loader.dispose()
+})