v0.2.0

Android:
- The Android APK is now a release asset — built on CI (Linux runner), with
  RAR/CBR support enabled, release-signed and update-installable.
- Light / e-ink theme (System / Light / Dark; follows the OS day/night setting by
  default) — usable on reflective e-ink panels.
- Android 10 support (legacy external storage + runtime READ permission), so the
  library and RAR work on older devices.
- Fixes: crash on relaunch (one winit EventLoop per process) and crash on resume
  from background on e-ink GPUs (rebuild the GPU on resume).

Desktop: unchanged from v0.1.41.