fix(artist-detail): Last.fm/Wikipedia/Favorite hover keeps button border (#966)

* fix(artist-detail): keep ext-link border visible on hover

Hover used --border-subtle, which on Catppuccin matches --bg-card and
visually erased the rim while only the fill changed. Match btn-surface:
--ctp-surface1 border, --ctp-overlay0 on hover.

* docs(changelog): credit zunoz on Psysonic Discord for PR #966

* fix(playlists): tooltips on Play/Add Songs and song count pluralization

Add data-tooltip to Play and Add Songs in playlist hero; switch
playlists.songs to count-based _one/_other forms (was {{n}} without
i18next plural suffix, breaking spacing and singular).

* fix(playlists): render BPM and optional cols in Suggested Songs rows

PlaylistSuggestions shared column headers with the main tracklist but
its row switch omitted bpm, genre, playCount, and lastPlayed.

src/locales/nb/playlists.ts

@@ -9,8 +9,10 @@ export const playlists = {
   emptyPlaylist: 'Denne spillelisten er tom.',
   addFirstSong: 'Legg til din første sang',
   notFound: 'Spillelisten ble ikke funnet.',
-  songs: '{{n}} sanger',
+  songs_one: '{{count}} sang',
+  songs_other: '{{count}} sanger',
   playAll: 'Spill alle',
+  playTooltip: 'Spill spilleliste',
   shuffle: 'Bland',
   addToQueue: 'Legg til i kø',
   back: 'Tilbake til spillelister',
@@ -18,6 +20,7 @@ export const playlists = {
   confirmDelete: 'Klikk igjen for å bekrefte',
   removeSong: 'Fjern fra spilleliste',
   addSongs: 'Legg til sanger',
+  addSongsTooltip: 'Søk i biblioteket og legg til sanger',
   searchPlaceholder: 'Søk i biblioteket ditt…',
   noResults: 'Ingen resultater.',
   suggestions: 'Foreslåtte sanger',