Full-screen ambient slideshow (DreamService + manual activity) fed by the
Immich API: random photos/videos with album, favorites and type filters,
portrait photos paired side by side, Ken Burns motion, crossfade/slide/zoom
transitions, inline muted video via ExoPlayer, date/location and clock
overlays, Leanback settings with email+password sign-in that mints a scoped
API key.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012BvT3RjNpBmMUsyPqHq7fm
