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>

android/app/src/main/kotlin/com/novasonic/app/api/LrcLibClient.kt

@@ -68,7 +68,7 @@ object LrcLibClient {
         val cacheKey = "$artist|$title"
         if (cache.containsKey(cacheKey)) return cache[cacheKey]
 
-        // 1. lrclib exact match — single request, only trust HTTP 200
+        // 1a. lrclib exact match with duration
         val exact = runCatching {
             val resp = client.get("https://lrclib.net/api/get") {
                 parameter("artist_name", artist)
@@ -78,9 +78,19 @@ object LrcLibClient {
             }
             if (resp.status == HttpStatusCode.OK) resp.body<LrcLibResponse>() else null
         }.getOrNull()
-
         if (exact.hasContent()) return exact.also { cache[cacheKey] = it }
 
+        // 1b. lrclib exact match without duration — handles version mismatches (e.g. 5:58 file vs 4:24 in lrclib)
+        val exactNoDur = if (durationSecs != null && !album.isNullOrBlank()) runCatching {
+            val resp = client.get("https://lrclib.net/api/get") {
+                parameter("artist_name", artist)
+                parameter("track_name", title)
+                parameter("album_name", album)
+            }
+            if (resp.status == HttpStatusCode.OK) resp.body<LrcLibResponse>() else null
+        }.getOrNull() else null
+        if (exactNoDur.hasContent()) return exactNoDur.also { cache[cacheKey] = it }
+
         // 2+3. lrclib search — artist+title and title-only in parallel (2 requests, not 3)
         val lrclibResult = coroutineScope {
             val artistDef = async {

android/app/src/main/kotlin/com/novasonic/app/ui/MainActivity.kt

@@ -35,12 +35,15 @@ private fun NovaSonicRoot() {
     val context = LocalContext.current
     val prefs   = remember { PrefsStore(context) }
     val creds   by prefs.credentials.collectAsStateWithLifecycle(
-        initialValue = PrefsStore.Credentials("", "", ""),
+        initialValue = null,
     )
 
     var forceLogin by remember { mutableStateOf(false) }
 
-    if (!creds.isValid || forceLogin) {
+    // null = still loading from DataStore; don't show anything yet to avoid login screen flash
+    if (creds == null) return
+
+    if (!creds!!.isValid || forceLogin) {
         LoginScreen(onLoggedIn = { forceLogin = false })
     } else {
         AppNavigation()

android/app/src/main/kotlin/com/novasonic/app/ui/screen/NowPlayingScreen.kt

@@ -118,7 +118,7 @@ fun NowPlayingScreen(
                 horizontalArrangement = Arrangement.SpaceBetween,
                 modifier = Modifier.fillMaxWidth()
                     .padding(horizontal = 20.dp)
-                    .padding(bottom = 16.dp),
+                    .padding(bottom = 28.dp),
             ) {
                 NpCircleBtn(onClick = onDismiss) {
                     Icon(Icons.Default.KeyboardArrowDown, "Schließen",
@@ -386,7 +386,7 @@ fun NowPlayingScreen(
                     // Center of active line sits at 30% from top (clearly upper area)
                     val targetY = (lyricsPaddingPx + activeIdx * lineHeightPx + lineHeightPx / 2f
                         - lyricsViewH * 0.30f).coerceAtLeast(0f)
-                    lyricsScrollState.animateScrollTo(targetY.toInt(), tween<Int>(280, easing = FastOutSlowInEasing))
+                    lyricsScrollState.animateScrollTo(targetY.toInt(), tween<Float>(280, easing = FastOutSlowInEasing))
                 }
 
                 when {