fix(api): refetch from server when online (stale-while-revalidate)

The Tier-2 rehydrated cache seeded fulfilled entries at startup, so RTKQ served stale data and never hit the network (manual metadata edits, etc. only appeared after clearing the cache). Enable refetchOnMountOrArgChange + refetchOnReconnect + refetchOnFocus and wire setupListeners, so the cached snapshot still shows instantly but the server silently revalidates it whenever reachable.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/api/index.ts

@@ -5,6 +5,15 @@ import { REHYDRATE_API, type RehydrateApiPayload } from './rehydrate';
 export const api = createApi({
   reducerPath: 'api',
   baseQuery: baseQueryWithReauth,
+  // Stale-while-revalidate. The Tier-2 rehydrated cache (below) seeds fulfilled
+  // entries at startup, which would otherwise make RTKQ serve stale data and
+  // never hit the network. These flags keep showing the cached snapshot
+  // instantly but silently refetch from the server whenever it's reachable —
+  // on mount/arg change, on reconnect, and on window refocus. The result: the
+  // server is the source of truth when online; the cache is only a fallback.
+  refetchOnMountOrArgChange: true,
+  refetchOnReconnect: true,
+  refetchOnFocus: true,
   tagTypes: [
     'Track',
     'Album',