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.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, it } from 'vitest';
+import { formatPlayerStatsDayLabel } from './formatPlayerStatsDay';
+
+const t = (key: string) => {
+  if (key === 'statistics.playerDayToday') return 'Today';
+  if (key === 'statistics.playerDayYesterday') return 'Yesterday';
+  return key;
+};
+
+describe('formatPlayerStatsDayLabel', () => {
+  it('labels today and yesterday', () => {
+    const today = new Date();
+    const y = today.getFullYear();
+    const m = String(today.getMonth() + 1).padStart(2, '0');
+    const d = String(today.getDate()).padStart(2, '0');
+    expect(formatPlayerStatsDayLabel(`${y}-${m}-${d}`, t, 'en')).toBe('Today');
+
+    const yest = new Date(today);
+    yest.setDate(yest.getDate() - 1);
+    const ym = String(yest.getMonth() + 1).padStart(2, '0');
+    const yd = String(yest.getDate()).padStart(2, '0');
+    expect(formatPlayerStatsDayLabel(`${yest.getFullYear()}-${ym}-${yd}`, t, 'en')).toBe('Yesterday');
+  });
+});

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);
+}

src/utils/playerStats/heatmapLevels.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, it } from 'vitest';
+import { heatmapCellMetrics } from './heatmapLevels';
+
+describe('heatmapCellMetrics', () => {
+  it('shrinks cells to fit narrow containers', () => {
+    const m = heatmapCellMetrics(400, 53);
+    expect(m.cell).toBeLessThan(14);
+    expect(m.cell).toBeGreaterThanOrEqual(4);
+    const total = m.labelW + m.bodyGap + 53 * m.cell + 52 * m.gap;
+    expect(total).toBeLessThanOrEqual(400 + 1);
+  });
+
+  it('caps at 14px on wide containers', () => {
+    const m = heatmapCellMetrics(1200, 53);
+    expect(m.cell).toBe(14);
+  });
+});

src/utils/playerStats/heatmapLevels.ts

@@ -0,0 +1,110 @@
+/** GitHub-style intensity bucket from track play count vs year max. */
+export function heatmapLevel(count: number, maxCount: number): 0 | 1 | 2 | 3 | 4 {
+  if (count <= 0 || maxCount <= 0) return 0;
+  const ratio = count / maxCount;
+  if (ratio >= 0.75) return 4;
+  if (ratio >= 0.5) return 3;
+  if (ratio >= 0.25) return 2;
+  return 1;
+}
+
+export const HEATMAP_LEVEL_COUNT = 5;
+
+export type HeatmapCell = { date: string; count: number };
+
+export function yearDayKeys(year: number): string[] {
+  const out: string[] = [];
+  const start = new Date(year, 0, 1);
+  const end = new Date(year, 11, 31);
+  for (let d = new Date(start); d <= end; d.setDate(d.getDate() + 1)) {
+    const y = d.getFullYear();
+    const m = String(d.getMonth() + 1).padStart(2, '0');
+    const day = String(d.getDate()).padStart(2, '0');
+    out.push(`${y}-${m}-${day}`);
+  }
+  return out;
+}
+
+/** Week columns (Sun→Sat rows) with leading/trailing padding cells. */
+export function heatmapWeekColumns(year: number, dayCounts: Map<string, number>): {
+  weeks: HeatmapCell[][];
+  maxCount: number;
+} {
+  const days = yearDayKeys(year);
+  const maxCount = Math.max(0, ...days.map(d => dayCounts.get(d) ?? 0));
+  const firstDow = new Date(year, 0, 1).getDay();
+  const cells: HeatmapCell[] = [];
+  for (let i = 0; i < firstDow; i++) {
+    cells.push({ date: '', count: 0 });
+  }
+  for (const date of days) {
+    cells.push({ date, count: dayCounts.get(date) ?? 0 });
+  }
+  while (cells.length % 7 !== 0) {
+    cells.push({ date: '', count: 0 });
+  }
+  const weeks: HeatmapCell[][] = [];
+  for (let i = 0; i < cells.length; i += 7) {
+    weeks.push(cells.slice(i, i + 7));
+  }
+  return { weeks, maxCount };
+}
+
+/** Month labels aligned to week columns (first day of each month). */
+export function heatmapMonthLabels(
+  year: number,
+  locale?: string,
+): { columnIndex: number; label: string }[] {
+  const fmt = new Intl.DateTimeFormat(locale, { month: 'short' });
+  const firstDow = new Date(year, 0, 1).getDay();
+  const labels: { columnIndex: number; label: string }[] = [];
+  let lastMonth = -1;
+  const yearStart = new Date(year, 0, 1).getTime();
+  const end = new Date(year, 11, 31);
+  for (let d = new Date(year, 0, 1); d <= end; d.setDate(d.getDate() + 1)) {
+    const month = d.getMonth();
+    if (month === lastMonth) continue;
+    const dayOfYear = Math.floor((d.getTime() - yearStart) / 86_400_000);
+    labels.push({
+      columnIndex: Math.floor((firstDow + dayOfYear) / 7),
+      label: fmt.format(new Date(year, month, 1)),
+    });
+    lastMonth = month;
+  }
+  return labels;
+}
+
+/** Weekday row labels (Sun–Sat); empty string hides a row label like GitHub. */
+export function heatmapWeekdayLabels(locale?: string): string[] {
+  const fmt = new Intl.DateTimeFormat(locale, { weekday: 'narrow' });
+  // Jan 4 2026 is Sunday — anchor week for stable weekday order.
+  const anchor = new Date(2026, 0, 4);
+  return Array.from({ length: 7 }, (_, i) => {
+    if (i % 2 === 0) return '';
+    const d = new Date(anchor);
+    d.setDate(anchor.getDate() + i);
+    return fmt.format(d);
+  });
+}
+
+const HEATMAP_LABEL_W = 24;
+const HEATMAP_BODY_GAP = 8;
+const HEATMAP_CELL_MIN = 4;
+const HEATMAP_CELL_MAX = 14;
+
+/** Fit square cells to the heatmap container width (week columns only). */
+export function heatmapCellMetrics(
+  containerWidth: number,
+  weekCount: number,
+): { cell: number; gap: number; labelW: number; bodyGap: number } {
+  const gap = containerWidth > 640 ? 3 : 2;
+  const available = containerWidth - HEATMAP_LABEL_W - HEATMAP_BODY_GAP;
+  if (available <= 0 || weekCount <= 0) {
+    return { cell: HEATMAP_CELL_MIN, gap, labelW: HEATMAP_LABEL_W, bodyGap: HEATMAP_BODY_GAP };
+  }
+  const cell = Math.min(
+    HEATMAP_CELL_MAX,
+    Math.max(HEATMAP_CELL_MIN, (available - (weekCount - 1) * gap) / weekCount),
+  );
+  return { cell, gap, labelW: HEATMAP_LABEL_W, bodyGap: HEATMAP_BODY_GAP };
+}