fix: preserve dictionaries in unwrap_py_scalar

Co-Authored-By: Myles Scolnick <myles@marimo.io>

marimo/_utils/narwhals_utils.py

@@ -147,8 +147,8 @@ def unwrap_py_scalar(value: Any) -> Any:
     from datetime import datetime, date
     import polars as pl
 
-    # Preserve datetime and date objects
-    if isinstance(value, (datetime, date)):
+    # Preserve datetime, date objects, and dictionaries
+    if isinstance(value, (datetime, date, dict)):
         return value
 
     try:
@@ -166,6 +166,9 @@ def unwrap_py_scalar(value: Any) -> Any:
         # For enums, convert to string, otherwise preserve the object
         if hasattr(scalar, '__members__'):  # Check if it's an enum
             return str(scalar)
+        # For dictionaries and other complex objects, preserve them
+        if isinstance(scalar, dict):
+            return scalar
         return scalar
     except ValueError:
         # If conversion fails, preserve the value as-is