Feat: script execution performance optimization

src/services/stack_preview.rs

@@ -43,7 +43,7 @@ pub fn update_cache(editor_ctx: &EditorContext) {
         let vars = Arc::new(ArcSwap::from_pointee(HashMap::new()));
         let dict = Arc::new(Mutex::new(HashMap::new()));
         let rng = Arc::new(Mutex::new(StdRng::seed_from_u64(42)));
-        let engine = ScriptEngine::new(vars, dict, rng);
+        let mut engine = ScriptEngine::new(vars, dict, rng);
 
         let ctx = StepContext {
             step: 0,