Further cleanup

src/routes/player/Player.tsx

src/routes/player/PreviewBar.tsx

src/routes/player/PreviewViewer.tsx

src/routes/player/SeekBar.tsx

src/routes/player/SeekBarContainer.tsx

src/routes/player/subtitles/SubtitleRenderer.tsx

src/routes/player/video/AudioSelection.tsx

src/routes/player/video/PlayerControls.tsx

src/routes/player/video/Track.tsx

src/routes/player/video/VideoContext.tsx