perf: memoize derived render data

src/utils/generationNotifier.ts

@@ -3,6 +3,8 @@
  * Falls back gracefully when Notification API is unavailable.
  */
 
+import { toast } from "../components/toast/toastStore";
+
 let permissionGranted = false;
 
 async function requestPermission(): Promise<boolean> {
@@ -35,9 +37,7 @@ export function notifyTaskCompleted(label: string, mode: "image" | "video" = "im
 
 // Use the existing toast system for in-app notifications
 function dispatchGenToast(msg: string) {
-  try {
-    import("../components/toast/toastStore").then((m) => m.toast(msg, "success"));
-  } catch { /* toast system not loaded */ }
+  toast(msg, "success");
 }
 
 /** Call once on app init to pre-warm permission. */