v0.5.51

Debug APK build for v0.5.51.

Unsigned debug build. Sideload at your own risk; signed release builds will arrive in a future version.

What's Changed

• refactor(auth): generalize AuthRepository for multi-source sign-in (PR1 of #426) by @jphein in #509
• feat(widget): adaptive now-playing widget with transport — closes #159 by @jphein in #510
• feat: TechEmpower as default use case — home screen + Library hero + Notion images + README repositioning by @jphein in #511
• feat(source-slack): channels-as-fictions via Slack Bot API — closes #454 by @jphein in #512
• feat(source-matrix): rooms-as-fictions via Matrix client-server API — closes #457 by @jphein in #513
• feat(notion): beautiful book covers — body-image fallback + branded synthetic cover tile by @jphein in #514

Full Changelog: v0.5.50...v0.5.51