Audit v2 silent-breakage: PullToRefreshBox needs scrollable content
in its nested-scroll connection to detect the gesture. Empty/Error
branches used a plain centered Column → no nested-scroll
participation → swipe gesture silently ignored → user can't recover
from a cold-load error.
Fix: re-house EmptyState inside a single-item LazyColumn with
fillParentMaxSize. Visual is identical (centered icon + title +
body) but LazyColumn participates in nested-scroll dispatch so
PullToRefreshBox fires on swipe-down.
Covers Empty + Error on every PullToRefreshScaffold-wrapped screen
(Home, Library tabs, Album/Artist/Playlist detail, Discover,
Requests, Admin*). Loading-state pull-to-refresh remains broken on
screens using per-screen LoadingCentered helpers — that's a
transient state and lower priority; separate follow-up if it
becomes a real friction.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>