The picker resolved StorageService asynchronously and rebuilt its profiles
stream once it landed. Storage is what supplies profile recency, so the second
view arrived re-sorted a microtask after first paint. The sliver children
carried no keys, so that reorder handed each tile's Element the next profile's
focus node; detaching the old node dropped primary focus onto the enclosing
scope and took the D-pad highlight with it. The launch picker has no back
route on tvOS, so a user who can no longer see or move the selection has
nothing useful left to press.
Read StorageService from the provider graph, where it is already resolved
before any route exists, so the stream is built once and the first painted
frame is already recency-sorted. Key the tiles and add findChildIndexCallback
so a later re-sort from a refreshed profile source moves a tile instead of
destroying it: without the lookup the sliver re-inflates the tile, which keeps
primary focus but resets FocusableWrapper's chrome to unfocused.
close#1792
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