feat(player-stats): local listening history tab with heatmap and summaries (#849)

* feat(player-stats): local listening history tab with heatmap and summaries

Record play sessions in library.sqlite when the library index is enabled,
add Rust read APIs and Tauri commands for year/day aggregates, and ship the
Player stats UI with session clustering, event-driven live refresh, and a
notice when some servers are excluded from indexing.

* test(player-stats): split play_session repo and expand test coverage

Move the repository into play_session/ (completion, cluster, integration tests),
add remap/purge/FK coverage in Rust, and cover ingestion gates plus live-refresh
hooks on the frontend per spec v0.3.

* docs(release): CHANGELOG and credits for player stats (PR #849)

* fix(player-stats): satisfy tsc and clippy CI gates

Use InternetRadioStation field names in the radio skip test and replace
manual month/day range checks with RangeInclusive::contains.

src/utils/playerStats/formatPlayerStatsDay.ts

@@ -0,0 +1,41 @@
+export const PLAYER_STATS_RECENT_DAYS_LIMIT = 30;
+
+export function localTodayIso(): string {
+  const d = new Date();
+  const y = d.getFullYear();
+  const m = String(d.getMonth() + 1).padStart(2, '0');
+  const day = String(d.getDate()).padStart(2, '0');
+  return `${y}-${m}-${day}`;
+}
+
+function parseLocalDate(dateIso: string): Date {
+  const [y, m, d] = dateIso.split('-').map(Number);
+  return new Date(y, m - 1, d);
+}
+
+function startOfLocalDay(date: Date): Date {
+  return new Date(date.getFullYear(), date.getMonth(), date.getDate());
+}
+
+/** Human-readable day header for recent-days accordion. */
+export function formatPlayerStatsDayLabel(
+  dateIso: string,
+  t: (key: string, opts?: Record<string, unknown>) => string,
+  locale?: string,
+): string {
+  const date = parseLocalDate(dateIso);
+  const today = startOfLocalDay(new Date());
+  const day = startOfLocalDay(date);
+  const diffDays = Math.round((today.getTime() - day.getTime()) / 86_400_000);
+
+  if (diffDays === 0) return t('statistics.playerDayToday');
+  if (diffDays === 1) return t('statistics.playerDayYesterday');
+
+  const fmt = new Intl.DateTimeFormat(locale, {
+    weekday: 'long',
+    month: 'short',
+    day: 'numeric',
+    year: date.getFullYear() !== today.getFullYear() ? 'numeric' : undefined,
+  });
+  return fmt.format(date);
+}