Feat: cleanup

src/app/mod.rs

@@ -1,3 +1,5 @@
+//! Application state: owns the project, editor context, and all UI/playback state.
+
 mod clipboard;
 mod dispatch;
 mod editing;
@@ -54,8 +56,8 @@ pub struct App {
     pub script_engine: ScriptEngine,
     pub variables: Variables,
     pub dict: Dictionary,
-    #[allow(dead_code)]
-    pub rng: Rng,
+    // Held to keep the Arc alive (shared with ScriptEngine).
+    pub _rng: Rng,
     pub live_keys: Arc<LiveKeyState>,
     pub clipboard: Option<arboard::Clipboard>,
     pub copied_patterns: Option<Vec<Pattern>>,
@@ -108,7 +110,7 @@ impl App {
             metrics: Metrics::default(),
             variables,
             dict,
-            rng,
+            _rng: rng,
             live_keys,
             script_engine,
             clipboard: arboard::Clipboard::new().ok(),