Fix quoting syntax in field extraction block

app.py

@@ -746,12 +746,15 @@ def process_receipt(image):
             fields = receipt_ocr.postprocess_receipt(ocr_results)
         
         fields_html = "<div style='padding: 16px; background: #f8f9fa; border-radius: 12px;'><h4>Extracted Fields</h4>"
-        for name, value in [('Vendor', fields.get('vendor')), ('Date', fields.get('date')), 
-                           ('Total', f\"${fields.get('total')}\" if fields.get('total') else None),
-                           ('Time', fields.get('time'))]:
-            display = value or '<span style=\"color: #adb5bd;\">Not found</span>'
-            fields_html += f\"<div style='padding: 8px; background: white; border-radius: 6px; margin: 4px 0;'><b>{name}:</b> {display}</div>\"
-        fields_html += \"</div>\"
+        for name, value in [
+            ('Vendor', fields.get('vendor')),
+            ('Date', fields.get('date')),
+            ('Total', f"${fields.get('total')}" if fields.get('total') else None),
+            ('Time', fields.get('time')),
+        ]:
+            display = value or '<span style="color: #adb5bd;">Not found</span>'
+            fields_html += f"<div style='padding: 8px; background: white; border-radius: 6px; margin: 4px 0;'><b>{name}:</b> {display}</div>"
+        fields_html += "</div>"
         results['fields'] = fields
     except Exception as e:
         fields_html = f\"<div style='color: red;'>Extraction error: {e}</div>\"