Allow signaling issues in label verification

copienator/prompting.py

@@ -237,7 +237,7 @@ import json
 
 
 def get_single_image_bytes(pdf_path):
-    """Converts a multi-page PDF into a single stitched JPEG in memory."""
+    """Convert PDF pages into a single JPEG, centering pages within the widest."""
     imgs = convert_from_path(pdf_path, dpi=200) # Same DPI as grouping.py
     if not imgs:
         raise ValueError(f"No pages in {pdf_path}")
@@ -250,7 +250,7 @@ def get_single_image_bytes(pdf_path):
         combined = Image.new('RGB', (max_width, total_height), 'white')
         y_offset = 0
         for img in imgs:
-            combined.paste(img, (0, y_offset))
+            combined.paste(img, ((max_width - img.width) // 2, y_offset))
             y_offset += img.height
 
     img_byte_arr = io.BytesIO()