fix(web): show non-Japanese names as-is with Romaji on (e.g. ☆NoAki☆ kept its stars)

With 'show Romaji' enabled, dispArtist/dispArtistById/dispArtistParts/dispTitle
substituted the sort tag for the display name unconditionally. For non-Japanese
names the sort tag is just a sort key (leading symbols/articles stripped, so
'☆NoAki☆' → 'NoAki'), which wrongly replaced the real name. Guard the substitution
on the original being Japanese — mirroring what dispAlbumName already did — so
Romaji only applies to Japanese names and everything else shows unchanged.
SW cache -> ns-v73.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'ns-v72';
+const CACHE = 'ns-v73';
 const PRECACHE = ['/', 'index.html', 'manifest.json', 'icon.svg'];
 const SKIP_PATHS = ['/rest/stream', '/rest/download', '/config.js'];
 // Auth token params stripped from cache keys so artwork survives across sessions/token refreshes.