Improve PDF export error handling and logging

Add detailed logging for file-saver failures and fallback download
attempts. Wrap fallback logic in try-catch to handle edge cases where
manual download also fails, providing better debugging and user-facing
error messages.

src/lib/pdf-export.tsx

@@ -21,6 +21,9 @@ function downloadBlob(blob: Blob, filename: string): void {
     // First try using file-saver
     saveAs(blob, filename);
   } catch (error) {
+    console.warn("file-saver failed, using fallback method:", error);
+
+    try {
       // Fallback to manual download
       const url = URL.createObjectURL(blob);
       const link = document.createElement("a");
@@ -37,8 +40,17 @@ function downloadBlob(blob: Blob, filename: string): void {
       link.click();
       document.body.removeChild(link);
 
+      console.log("PDF download initiated successfully via fallback method");
+
       // Clean up the object URL
-    setTimeout(() => URL.revokeObjectURL(url), 1000);
+      setTimeout(() => {
+        URL.revokeObjectURL(url);
+        console.log("Object URL cleaned up");
+      }, 1000);
+    } catch (fallbackError) {
+      console.error("Both download methods failed:", fallbackError);
+      throw new Error("Unable to download PDF file");
+    }
   }
 }