feat: add quality selection, improve chapter panel UX, and show VOD view counts

Quality selection during playback:
- Add getAvailableQualities() in streamlink via --json, sorted by fixed order
- Expose playback:get-qualities IPC channel (handlers, preload, type declarations)
- Add quality panel in PlaybackOverlay:
  - Button + dropdown
  - Keyboard navigation (X: open, arrows: navigate, Enter: confirm, Escape: close)
- Quality change triggers streamlink restart; VOD resumes at current position
- Available in ChannelScreen (Live + VOD) and AppShell global overlay (Live)
- Add QualityIcon

Chapter panel UX improvements:
- Video no longer pauses when chapter panel opens
- PlaybackOverlay is hidden via conditional render instead
- Remove wasPlayingBeforeChapters state (no longer needed)
- X button seeks to video start when no chapters are found, with hint in panel UI

VOD cards and defaults:
- Show view count with eye icon on VOD cards (matching playback overlay style)
- Change default streamBadgeMode from 'language' to 'both'

package.json

@@ -1,6 +1,6 @@
 {
   "name": "twitch4steamdeck",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "Twitch-Client für das Steam Deck (Live & VOD, Big-Screen-UI)",
   "main": "out/main/index.js",
   "author": "twitch4steamdeck",