release: bump to 3.0.0 and refresh F-Droid metadata

Bump versionCode to 13 and versionName to 3.0.0. The Flutter app ended at
2.0.0-alpha.3+12 (versionCode 12), so 13 keeps the eventual com.subtracks
release an in-place upgrade.

Metadata was still inherited from the Flutter app:
- add the changelog for versionCode 13
- rewrite the descriptions for the native app
- replace the Flutter phone screenshots with native renders, and mute the
  screenshot fixture palette so the placeholder artwork reads as covers
This commit is contained in:
austinried
2026-10-04 00:30:08 +00:00
parent 836d0636d1
commit e7ee6fa9a2
13 changed files with 27 additions and 15 deletions
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