many changes

src/lib/stores/sleepTimer.ts

@@ -5,6 +5,8 @@
  * All logic is in the Rust backend (PlayerController).
  *
  * The backend emits SleepTimerChanged events to update this store.
+ *
+ * TRACES: UR-026 | DR-029
  */
 
 import { writable, derived } from "svelte/store";