fix(web-admin): polyfill Buffer/global for contract Word export in Vite

html-to-docx still reads Node globals after Vite rebundles; inject buffer polyfill, map global to globalThis, and alias the package to the browser build.

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/env.d.ts

@@ -17,6 +17,18 @@ declare module 'vue-img-cutter'
 
 declare module 'file-saver'
 
+declare module 'buffer'
+
+declare module '@turbodocx/html-to-docx' {
+  const HTMLtoDOCX: (
+    htmlString: string,
+    headerHTMLString?: string | null,
+    documentOptions?: Record<string, unknown>,
+    footerHTMLString?: string | null
+  ) => Promise<Blob | ArrayBuffer>
+  export default HTMLtoDOCX
+}
+
 declare module '@turbodocx/html-to-docx/dist/html-to-docx.browser.esm.js' {
   const HTMLtoDOCX: (
     htmlString: string,