* 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.
Each src/locales/<lang>.ts (~1800 LOC) becomes a folder src/locales/<lang>/
with one module per i18n namespace (44 each) plus an index.ts barrel that
reassembles <lang>Translation in the original key order.
Mechanical, script-driven split with a JSON round-trip check: every
locale object is byte-identical to its pre-split form. i18n.ts is
unchanged — './locales/<lang>' now resolves to the folder index.
The per-namespace settings.ts files land ~440-460 LOC; a single i18n
namespace is the natural, non-arbitrary split unit for a flat string
table, so they are intentionally left whole.