fix: memory leak in PDF to images conversion (#2325)

Add proper cleanup for PDF.js pages and loading task to prevent memory
leaks when
processing multiple PDF pages. Ensure page cleanup is called after each
page is
rendered and both PDF document and loading task are properly destroyed
with error
handling.

packages/lib/server-only/ai/pdf-to-images.ts

@@ -44,10 +44,12 @@ export type PdfToImagesOptions = {
 export const pdfToImages = async (pdfBytes: Uint8Array, options: PdfToImagesOptions = {}) => {
   const { scale = 2 } = options;
 
-  const pdf = await pdfjsLib.getDocument({
+  const task = await pdfjsLib.getDocument({
     data: pdfBytes,
     CanvasFactory: SkiaCanvasFactory,
-  }).promise;
+  });
+
+  const pdf = await task.promise;
 
   const images = await pMap(
     Array.from({ length: pdf.numPages }),
@@ -68,18 +70,23 @@ export const pdfToImages = async (pdfBytes: Uint8Array, options: PdfToImagesOpti
         viewport,
       }).promise;
 
-      return {
+      const result = {
         pageNumber,
         image: await canvas.toBuffer('jpeg'),
         width: Math.floor(viewport.width),
         height: Math.floor(viewport.height),
         mimeType: 'image/jpeg',
       };
+
+      void page.cleanup();
+
+      return result;
     },
     { concurrency: 10 },
   );
 
-  void pdf.destroy();
+  void pdf.destroy().catch((e) => console.error(e));
+  void task.destroy().catch((e) => console.error(e));
 
   return images;
 };