#1412 we should be calling mergeMaps instead of just overriding as mergeMaps takes care of nested style properties recursively (#1413)

Co-authored-by: kmahmood74 <[email protected]>

Author: kmahmood74

lib/framework/theme_manager.dart

@@ -268,7 +268,7 @@ class EnsembleTheme {
       String key = '.$className'; // Prepend '.' to match the style keys
       var classStyle = styles[key];
       if (classStyle != null) {
-        resolvedStyles = {...resolvedStyles, ...classStyle};
+        resolvedStyles = mergeMaps(resolvedStyles, classStyle);
       }
     }
     return resolvedStyles;