Linthra 0.1.5 — Playback stability hotfix.

Fixed:
- Fixed a playback stability issue where music could resume by itself
  after screen wake, app switching, or audio-focus changes.
- Fixed cases where playback could pause unexpectedly during transient
  audio-focus changes.
- Improved pause/play reliability across the app, lock screen, Android
  Auto, Bluetooth, and background playback.

Notes:
- No new features in this release.
- Navidrome/Subsonic cover art improvements from 0.1.4 remain included.

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