- Refactor PDF loading across workflow nodes to use loadPdfDocument utility

- Replaced direct calls to PDFDocument.load with loadPdfDocument in multiple nodes to standardize PDF loading process.

src/js/utils/ghostscript-dynamic-loader.ts

@@ -52,7 +52,8 @@ export async function loadGhostscript(): Promise<GhostscriptInterface> {
     } catch (error: any) {
       loadPromise = null;
       throw new Error(
-        `Failed to load Ghostscript from ${normalizedUrl}: ${error.message}`
+        `Failed to load Ghostscript from ${normalizedUrl}: ${error.message}`,
+        { cause: error }
       );
     }
   })();