feat: migrate pdfjs to local & bump ver

src/lib/pdfjsExtension.ts

@@ -0,0 +1,26 @@
+import * as pdfjs from "pdfjs-dist";
+import browser from "webextension-polyfill";
+import pdfWorkerHref from "pdfjs-dist/build/pdf.worker.min.mjs?url";
+import pdfLegacyHref from "pdfjs-dist/legacy/build/pdf.min.mjs?url";
+
+function extensionAssetUrl(viteAssetHref: string): string {
+  const path = viteAssetHref.replace(/^\/+/, "");
+  return browser.runtime.getURL(path);
+}
+
+let workerConfigured = false;
+
+/** Required before pdfjs spawns a worker (content-script / extension isolate). */
+export function ensurePdfjsWorker(): void {
+  if (workerConfigured) return;
+  pdfjs.GlobalWorkerOptions.workerSrc = extensionAssetUrl(pdfWorkerHref);
+  workerConfigured = true;
+}
+
+/** Page-context script on Firefox must load these chrome-extension:// URLs (see web_accessible_resources). */
+export function getPdfjsPageContextUrls(): { lib: string; worker: string } {
+  return {
+    lib: extensionAssetUrl(pdfLegacyHref),
+    worker: extensionAssetUrl(pdfWorkerHref),
+  };
+}