feat(artist): sort albums by year on artist detail (#877)

* feat(artist): year sort for albums section on artist detail

Add a sort dropdown next to "Albums by …" with release-type grouping (default),
newest-first, and oldest-first by album year.

* chore: note PR #877 in CHANGELOG and settings credits

* fix(artist): toggle year sort inside release groups, session per server

Replace dropdown with a click-to-toggle newest/oldest button. Keep release-type
blocks; sort albums by year within each group. Persist order in session store.

src/utils/library/sortArtistAlbums.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it } from 'vitest';
+import type { SubsonicAlbum } from '../../api/subsonicTypes';
+import { sortArtistAlbumsByYear } from './sortArtistAlbums';
+
+const album = (id: string, name: string, year?: number): SubsonicAlbum => ({
+  id,
+  name,
+  artist: 'A',
+  artistId: 'a',
+  songCount: 1,
+  duration: 1,
+  year,
+});
+
+describe('sortArtistAlbumsByYear', () => {
+  const albums = [
+    album('3', 'Gamma', 2000),
+    album('1', 'Alpha', 1990),
+    album('2', 'Beta', 2000),
+  ];
+
+  it('sorts by year descending then name', () => {
+    expect(sortArtistAlbumsByYear(albums, 'yearDesc').map(a => a.id)).toEqual(['2', '3', '1']);
+  });
+
+  it('sorts by year ascending then name', () => {
+    expect(sortArtistAlbumsByYear(albums, 'yearAsc').map(a => a.id)).toEqual(['1', '2', '3']);
+  });
+});

src/utils/library/sortArtistAlbums.ts

@@ -0,0 +1,17 @@
+import type { SubsonicAlbum } from '../../api/subsonicTypes';
+
+export type ArtistAlbumYearOrder = 'yearDesc' | 'yearAsc';
+
+export function sortArtistAlbumsByYear(
+  albums: SubsonicAlbum[],
+  order: ArtistAlbumYearOrder,
+): SubsonicAlbum[] {
+  const out = [...albums];
+  out.sort((a, b) => {
+    const ay = a.year ?? 0;
+    const by = b.year ?? 0;
+    if (ay !== by) return order === 'yearDesc' ? by - ay : ay - by;
+    return a.name.localeCompare(b.name, undefined, { sensitivity: 'base' });
+  });
+  return out;
+}