APK: taxonomy-version full resync (5bf7fdc)

Built from draft/android-category-sync @ 5bf7fdc (PR #6).

Includes:

• Always background-sync / pull-to-refresh full sync (prior commits)
• Full post resync when server taxonomy_version changes so category badges cannot stay stuck on stale local cache

Direct: https://github.com/djbclark/superbrain/releases/download/apk-android-category-resync-5bf7fdc/superbrain-android-category-sync.apk