The custom sidebar read as an ad-hoc widget: collapsed rows were the
expanded layout clipped to the strip, the libraries tree used a
staircase of indents and mixed row heights, and hover expansion pushed
the whole content area sideways.
Rebuild the rail on M3 Expressive geometry: collapsed destinations are
icon-only 56x32 pills centered in an 80px strip (48px icon-only on TV),
expanded rows are fixed-height destinations with a full-width stadium
indicator, and the two layouts crossfade/lerp during the width morph
instead of clipping. The libraries section is flattened into full-width
destination rows under a chevron header at standard destination
metrics, hover/touch expansion overlays content as a rounded, shadowed
panel over a dimmed scrim instead of pushing it, and rail width, item
morphs, content translate, and bleed all share one duration/curve.
getServerBoundPlexClient/getClientForLibrary existed only for their own unit tests; MetadataEditAdapter.backend and Plex's unreachable prefKey fallback and music-kind branches had no production path (edit is double-gated on supportsKind); MainScreenFocusScope's focus aspect, isSidebarFocused, and focusContent were write-only; resolveActivePlexIdentity.preferredAccount was never passed; ProfileRegistry.get was unused outside tests — its removal exposed a stale test contract, now pinned correctly: list() deliberately never serves plex_home rows.
edde746