fix: login flash, album name casing, lrclib duration mismatch

- Android: show nothing while DataStore loads credentials (null initial
  value) to prevent login screen flash on startup when already logged in
- Web: dispAlbumName now only uses sortName as romaji for Japanese titles;
  English albums with lowercase ALBUMSORT tags now display correct casing
- lrclib: add no-duration fallback exact match to find songs where local
  file duration differs from lrclib entry (e.g. Sanctuary Opening 5:58 vs 4:24)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/player/nowplaying.js

@@ -174,7 +174,7 @@ async function _loadNpLyrics(songId) {
     return;
   }
 
-  // 1. lrclib exact match — single request, only trust HTTP 200
+  // 1a. lrclib exact match with duration
   const exactP = new URLSearchParams({ artist_name: artist, track_name: title });
   if(album) exactP.set('album_name', album);
   if(dur)   exactP.set('duration', dur);
@@ -187,6 +187,18 @@ async function _loadNpLyrics(songId) {
     }
   } catch {}
 
+  // 1b. exact match without duration — handles version mismatches (e.g. file at 5:58, lrclib has 4:24)
+  if(!result && dur && album) {
+    try {
+      const exactNoDurP = new URLSearchParams({ artist_name: artist, track_name: title, album_name: album });
+      const r = await fetch(`https://lrclib.net/api/get?${exactNoDurP}`, { signal: SIG() });
+      if(r.status === 200) {
+        const d = await r.json();
+        if(d?.syncedLyrics || d?.plainLyrics || d?.instrumental) result = d;
+      }
+    } catch {}
+  }
+
   if(token !== _lyricsLoadToken) return;
 
   // 2+3. lrclib search — artist+title and title-only in parallel (2 requests, not 3)