refactor: remove unused imports and redundant code in MusicPlayer and AppLayout components

src/contexts/MusicPlayerContext.tsx

@@ -1,4 +1,4 @@
-import { createContext, useContext, useState, useRef, useEffect, type ReactNode } from 'react'
+import { createContext, useContext, useState, useEffect, type ReactNode } from 'react'
 import { useSocket } from './SocketContext'
 import { apiService } from '@/services/api'