Fix indentation error: correct if-else block alignment in barcode detection

- Fixed IndentationError at line 677 in pdf_comparator.py
- Corrected indentation of else block to properly align with if statement
- Fixed Box constructor indentation to match surrounding code structure
- Resolves unindent does not match any outer indentation level error

pdf_comparator.py

@@ -386,7 +386,7 @@ def load_pdf_pages(path: str, dpi: int = 400, max_pages: int = 5) -> List[Image.
                     continue
                     
                 return [img.convert("RGB") for img in imgs]
-            except Exception as e:
+        except Exception as e:
                 if poppler_path is None:  # All pdf2image attempts failed
                     break
                 continue  # Try next path
@@ -405,7 +405,7 @@ def load_pdf_pages(path: str, dpi: int = 400, max_pages: int = 5) -> List[Image.
                     pages.append(img.convert("RGB"))
                 doc.close()
                 return pages
-            except Exception as e:
+        except Exception as e:
                 raise ValueError(f"Failed to convert PDF with both pdf2image and PyMuPDF. pdf2image error: poppler not found. PyMuPDF error: {str(e)}")
         else:
             raise ValueError(f"Failed to convert PDF to image with all poppler paths. Last error: poppler not found. PyMuPDF not available as fallback.")