Improve image processing by using original image quality

Update image editor to use original image URLs for overlay configuration, ensuring full image dimensions and quality are preserved in server-side processing.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/Hpj2VzR

client/src/pages/image-editor.tsx

@@ -101,9 +101,10 @@ export default function ImageEditor() {
       }
 
       // Send overlay configuration to server - let server handle image processing
+      // IMPORTANT: Always use originalUrl (not previewUrl) to preserve full image dimensions
       const overlayConfig = {
         mediaId: selectedMedia.id,
-        imageUrl: previewUrl || selectedMedia.originalUrl,
+        imageUrl: selectedMedia.originalUrl, // Use original for full quality
         ribbon: ribbon.enabled ? {
           text: ribbon.text,
           color: ribbon.color,