Long-backgrounded sessions (especially on aggressive vendors like Huawei)
could leave the Play token invalid and OkHttp's connection pool full of
dead sockets, producing a perpetual loading spinner with no error.
- ComposeActivity#onStart probes the saved token via isSavedAuthDataValid;
on failure evicts the OkHttp pool and refreshes anonymous auth.
- AuthProvider gains authReady StateFlow, awaitReady(), and a mutex-guarded
refreshAnonymousAuth() so concurrent callers don't double-fetch.
- Play-backed ViewModels (AppDetails, DevProfile, MoreApps, Reviews, Search,
ExpandedStreamBrowse, Category) await refresh completion before issuing
helper calls, closing the race between resume-time refresh and screen
LaunchedEffect fetches.
- AppDetailsScreen rendered Error as Loading when app was null; reorder so
Error wins and wire a Retry button through Placeholder.
- Stream/Review/Search/DevProfile/CategoryBrowse error placeholders gain
Retry actions wired to PagingItems.retry() or the VM's fetch.
- CategoryViewModel was logging-only on failure; now emits ViewState.Error
with a matching Retry path in CategoriesPage.
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