refactor(musik): integrate music player library functions and fix build errors

- Integrate togglePlayPause, getNextIndex, getPrevIndex, handleRepeatOrNext, seekTo, toggleShuffle, setAudioVolume, toggleMute library functions
- Fix ESLint warnings: remove unused eslint-disable, add missing useEffect dependencies
- Fix ESLint error in useMusicPlayer.ts togglePlayPause function
- Add force-dynamic export to root layout to prevent prerendering errors
- Improve seek slider with preview/commit functionality
- Add isSeeking state to prevent UI flickering during seek

Fixes: Build PageNotFoundError for admin/darmasaba pages

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

src/app/darmasaba/(pages)/musik/lib/volume.ts

@@ -0,0 +1,29 @@
+import { RefObject } from "react";
+
+export function setAudioVolume(
+  audioRef: RefObject<HTMLAudioElement | null>,
+  volume: number,
+  setVolume: (v: number) => void,
+  setIsMuted: (v: boolean) => void
+) {
+  if (!audioRef.current) return;
+
+  audioRef.current.volume = volume / 100;
+  setVolume(volume);
+
+  if (volume > 0) {
+    setIsMuted(false);
+  }
+}
+
+export function toggleMute(
+  audioRef: RefObject<HTMLAudioElement | null>,
+  isMuted: boolean,
+  setIsMuted: (v: boolean) => void
+) {
+  if (!audioRef.current) return;
+
+  const muted = !isMuted;
+  audioRef.current.muted = muted;
+  setIsMuted(muted);
+}