Audit v2 #22. LibraryRepository.shuffleLibrary wraps the existing
LibraryApi.shuffleLibrary endpoint; LibraryViewModel.shuffleAll
fires PlayerController.setQueue with the response. LibraryScreen's
TopAppBar gains a Lucide.Shuffle IconButton to the left of the
existing MainAppBarActions row.
Offline-fallback (client-side shuffle over the local cache index)
is part of the larger Connectivity slice (audit #21) and not wired
in this commit — pressing Shuffle when offline just fails silently
for now.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>