refactor(CodeEditor): update module references for undo/redo functionality

- Changed references from `modules` to `coreModules` in the `handleUndo` and `handleRedo` functions to align with the updated module loading structure.
- Improved code clarity and maintainability by ensuring consistent usage of the core modules for command handling.

Author: tsck

packages/code-editor/src/CodeEditor/CodeEditor.tsx

@@ -166,30 +166,30 @@ export const CodeEditor = forwardRef<CodeEditorHandle, CodeEditorProps>(
      * @returns boolean indicating if undo was successful
      */
     const handleUndo = useCallback((): boolean => {
-      const commands = modules?.['@codemirror/commands'];
+      const commands = coreModules?.['@codemirror/commands'];
 
       if (!editorViewRef.current || !commands) {
         console.warn('Undo is not available - editor or commands not loaded');
         return false;
       }
 
       return commands.undo(editorViewRef.current);
-    }, [modules]);
+    }, [coreModules]);
 
     /**
      * Redoes the last undone editor action if possible.
      * @returns boolean indicating if redo was successful
      */
     const handleRedo = useCallback((): boolean => {
-      const commands = modules?.['@codemirror/commands'];
+      const commands = coreModules?.['@codemirror/commands'];
 
       if (!editorViewRef.current || !commands) {
         console.warn('Redo is not available - editor or commands not loaded');
         return false;
       }
 
       return commands.redo(editorViewRef.current);
-    }, [modules]);
+    }, [coreModules]);
 
     useLayoutEffect(() => {
       const EditorView = coreModules?.['@codemirror/view'];