On TV, pressing UP in the library Collections or Playlists grid snapped
the list back to the top and dropped focus on the tab chips, making long
lists impossible to navigate. Default directional focus traversal scrolls
the found card into view via Scrollable.ensureVisible, whose
outer-scrollable pass routes through the NestedScrollView coordinator and
resets the inner grid position to zero on every UP press.
Give the shared paginated card grid explicit per-card d-pad navigation,
matching the browse tab: managed per-index focus nodes, row/column moves
that request focus directly, first-row UP to the tab bar, and
first-column LEFT to the sidebar. Focus changes now scroll only through
FocusableWrapper's delta-based auto-scroll.
close#1977
edde746
a2b3377d91