refacxtor the code

server/src/tools/semantic_tokens.py

@@ -26,6 +26,11 @@ class Token:
     tok_type: str = ""
     tok_modifiers: List[TokenModifier] = attrs.field(factory=list)
 
+    @property
+    def length(self) -> int:
+        """Compatibility alias for misspelled 'lenght' field."""
+        return self.lenght
+
 
 TOKEN_TYPES = [
     "keyword",