Fixed darkmode load and save

src/myfasthtml/core/utils.py

@@ -247,6 +247,21 @@ def pascal_to_snake(name: str) -> str:
   s2 = re.sub(r'([a-z0-9])([A-Z])', r'\1_\2', s1)
   return s2.lower()
 
+
+def snake_to_pascal(name: str) -> str:
+  """Convert a snake_case string to PascalCase."""
+  if name is None:
+    return None
+  
+  name = name.strip()
+  if not name:
+    return ""
+  
+  # Split on underscores and capitalize each part
+  parts = name.split('_')
+  return ''.join(word.capitalize() for word in parts if word)
+
+
 @utils_rt(Routes.Commands)
 def post(session, c_id: str, client_response: dict = None):
   """