feat(home): Because you listened recommendation rail (#489)

* feat(home): "Because you listened" recommendation rail

New Home rail (under Recently Added, default on, toggleable in Settings →
Personalisation → Home Page) that surfaces 3 albums from artists similar
to one of your top-played artists. Anchor rotates per Home mount so a
different top-artist seeds the recommendations each visit; within each
anchor, both the similar-artist subset and the chosen album per artist
are randomised, so the same anchor returns different picks on subsequent
visits.

Card layout matches the regular Album cards' surface (--bg-card with
accent-tinted border + 1px inset top highlight) and gets the same
Play / Enqueue hover overlay buttons. Cover and meta scale via CSS only
— no infinite animations, no filter/blur/transform, no compositing
layers. Grid wraps below 3-up at <400px card width instead of shrinking.

API budget: one getArtistInfo2 + 6 parallel getArtist calls per Home
mount, both reusing the existing mostPlayed payload to derive the anchor
pool (no extra API call to find top artists). All 8 locales seeded.

* fix(home): ru plurals + per-server anchor + narrower card grid

- ru: add _few / _many for becauseYouLikeTracks (CLDR Russian needs
  4 forms — 3 треков was wrong, now 3 трека).
- Anchor rotation memory is now per-server. The localStorage key
  becomes psysonic_because_anchor:<serverId>; switching servers no
  longer aliases server A's rotation onto server B's pool.
- because-card grid minmax(400px, 1fr) -> minmax(340px, 1fr) so two
  cards fit side by side at typical sidebar-expanded widths instead
  of collapsing to a single card per row.

* docs: CHANGELOG + Contributors entry for Because-you-listened rail (PR #489)

* style(home): blurred cover backdrop + centred layout for Because-cards

- Each Because-card renders the album cover as a blurred, low-opacity
  full-bleed background layer behind the existing cover thumb and text.
  Resolved through useCachedUrl so the cache layer feeds it (same key
  as the thumbnail) instead of a fresh salted URL on every render.
- Card content (cover thumb + text block) now centred horizontally and
  vertically within the card; the meta line lives in a small pill that
  sits centred under the artist row.
- Text contrast halo and meta-pill background are theme-aware via
  color-mix on var(--bg-card) / var(--text-primary), so the same rules
  read on dark and light themes (was hard-coded rgba black before and
  smudged the type on Latte / Nord Snowstorm).

src/locales/ru.ts

@@ -49,6 +49,13 @@ export const ruTranslation = {
     discoverMore: 'Смотреть ещё',
     discoverArtists: 'Исполнители',
     discoverArtistsMore: 'Все исполнители',
+    becauseYouLike: 'Потому что вы слушали…',
+    becauseYouLikeFor: 'Потому что вы слушали {{artist}}',
+    similarTo: 'Похоже на {{artist}}',
+    becauseYouLikeTracks_one: '{{count}} трек',
+    becauseYouLikeTracks_few: '{{count}} трека',
+    becauseYouLikeTracks_many: '{{count}} треков',
+    becauseYouLikeTracks_other: '{{count}} треков',
   },
   hero: {
     eyebrow: 'Альбом дня',