Un-gates music libraries; adds CardShape.square plumbing (circular
artists), artists/albums/tracks browse groupings with per-grouping
sorts, audio playlists tab, artist + album detail screens with dpad
track rows, music context-menu actions, and a stub MusicPlaybackService
seam for the upcoming engine.
Profile traces showed 100-370ms UI-thread frames while scrolling the
library screen, dominated by rebuilding and inflating media cards.
- Gate per-card focus/pointer chrome on input mode: FocusableWrapper
skips the scale/border wrappers and creates its AnimationController
lazily outside keyboard mode, and ClickableCursor plus the card tap
region only build MouseRegion/InkWell machinery on desktop - TV and
touch use a bare GestureDetector. Hub cards also drop their outer
gesture wrapper outside keyboard mode; the card's own tap region
always won the gesture arena anyway.
- Memoize sliver children (SliverChildMemo): browse/collections grids
and hub rows return identical widget instances for unchanged items,
so delegate swaps from pagination, watch-state, and deletion
setStates no longer rebuild every realized card inside layout. The
browse tab prunes the memo in lockstep with focus-node eviction so a
cached card can never resurrect a disposed FocusNode.
- Budget fresh inflation (CardInflationBudget): while a scrollable is
moving in pointer/touch mode at most one new card inflates per frame,
the rest render as SkeletonMediaCard and upgrade on following frames.
Hub rows also stop pre-inflating 250px of off-screen cards on entry.
Device traces: worst frame 373ms -> 103ms, per-card build 3.6ms ->
2.4ms median; remaining row-entry work is spread across frames.
Poster images are decorative (the card exposes one merged node), and
the default per-child AutomaticKeepAlive/_SelectionKeepAlive/
IndexedSemantics wrappers are inert here — no keep-alive clients or
SelectionArea exist. The semantics phase ran ~9ms every frame on TV
devices with an accessibility service; it scales with node count.
- Add left navigation from hubs to sidebar when at leftmost item
- Add up navigation from first hub to tab bar (Libraries) or hero section (Discover)
- Enhance HubSection with onNavigateLeft and onNavigateUp callbacks
- Update _handleVerticalNavigation to return false at top boundary for proper UP handling
- Implement _navigateToSidebar() in Library Recommended tab and Discover screen
- Update all HubSection instances with proper navigation callbacks
edde746