Fix TypeScript ref typings and lint errors

src/hooks/useTouchGestures.ts

@@ -1,4 +1,4 @@
-import { useEffect, RefObject } from 'react'
+import { useEffect, MutableRefObject } from 'react'
 import { usePlayerContext } from '../contexts/PlayerContext'
 
 interface TouchData {
@@ -9,7 +9,7 @@ interface TouchData {
   tapCount: number
 }
 
-export const useTouchGestures = (containerRef: RefObject<HTMLDivElement>) => {
+export const useTouchGestures = (containerRef: MutableRefObject<HTMLDivElement | null>) => {
   const { videoState, togglePlay, seek, setVolume } = usePlayerContext()
 
   useEffect(() => {