feat(albums): "Artist → Year" album sort option (#1120)

* feat(albums): "Artist → Year" sort option

Adds a third album browse sort that groups albums by artist and orders each
artist's albums chronologically (oldest first, title as a same-year tiebreak)
— the double-sort requested in #1113. The local index sorts globally via
[{artist},{year},{name}]; the server fallback fetches by artist and applies the
year ordering per page (Subsonic has no compound sort).

* i18n(albums): Artist → Year sort label (9 locales)

* docs(changelog): add Artist → Year to the album sorting entry (#1120)

src/locales/nl/albums.ts

@@ -2,6 +2,7 @@ export const albums = {
   title: 'Alle albums',
   sortByName: 'A–Z (Album)',
   sortByArtist: 'A–Z (Artiest)',
+  sortByArtistYear: 'Artiest → Jaar',
   sortNewest: 'Nieuwste eerst',
   sortRandom: 'Willekeurig',
   yearFrom: 'Van',