fix(android settings): remove open delay — seed theme instead of a loading gate

The previous flicker fix gated the whole settings form behind a 'loaded' spinner,
which read as a small lag when opening Settings (it waited for DataStore's first
emit even though it's already warm). Instead, expose the applied theme id
(NsColors.themeId, set in applyNsTheme) and seed the ViewModel's initial state with
it, so the theme picker no longer jumps from the default — no gate, no spinner, no
delay. Remaining text fields fill within a frame from the warm DataStore.

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

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

@@ -67,15 +67,6 @@ fun SettingsScreen(onOpenStats: () -> Unit = {}) {
         )
     }
 
-    // Wait for the persisted settings before drawing the form — otherwise the default state
-    // (e.g. theme = Dark Ocean) flashes for a frame and then jumps to the real values.
-    if (!state.loaded) {
-        Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
-            CircularProgressIndicator(color = NsAccent)
-        }
-        return
-    }
-
     Column(
         verticalArrangement = Arrangement.spacedBy(12.dp),
         modifier = Modifier

android/app/src/main/kotlin/com/novasonic/app/ui/theme/Color.kt

@@ -7,6 +7,7 @@ import androidx.compose.ui.graphics.Color
 
 // ── Dynamic theme state — Compose tracks reads automatically ─────────────────
 object NsColors {
+    var themeId    by mutableStateOf("dark-ocean")   // currently applied theme id (readable)
     var accent     by mutableStateOf(Color(0xFF4F8EF7))
     var accentDim  by mutableStateOf(Color(0xFF2A6CD6))
     var bg         by mutableStateOf(Color(0xFF070D14))
@@ -88,6 +89,7 @@ val NS_THEMES = listOf(
 
 fun applyNsTheme(themeId: String) {
     val t = NS_THEMES.find { it.id == themeId } ?: NS_THEMES.first()
+    NsColors.themeId   = t.id
     NsColors.accent    = t.accent
     NsColors.accentDim = t.accentDim
     NsColors.bg        = t.bg

android/app/src/main/kotlin/com/novasonic/app/viewmodel/SettingsViewModel.kt

@@ -6,6 +6,7 @@ import androidx.lifecycle.viewModelScope
 import com.novasonic.app.api.AbsClient
 import com.novasonic.app.app
 import com.novasonic.app.data.PrefsStore
+import com.novasonic.app.ui.theme.NsColors
 import io.ktor.client.HttpClient
 import io.ktor.client.engine.android.Android
 import io.ktor.client.plugins.HttpTimeout
@@ -35,7 +36,6 @@ data class SettingsUiState(
     val absUrl: String              = "",
     val absApiKey: String           = "",
     val absChapterTrackMode: Boolean = false,
-    val loaded: Boolean             = false,
     val isSaving: Boolean           = false,
     val savedOk: Boolean      = false,
     val error: String?        = null,
@@ -48,7 +48,8 @@ class SettingsViewModel(app: Application) : AndroidViewModel(app) {
 
     private val repo = app.app.repository
 
-    private val _state = MutableStateFlow(SettingsUiState())
+    // Seed the theme with the already-applied one so the picker doesn't jump before DataStore emits.
+    private val _state = MutableStateFlow(SettingsUiState(theme = NsColors.themeId))
     val state: StateFlow<SettingsUiState> = _state
 
     init {
@@ -67,7 +68,6 @@ class SettingsViewModel(app: Application) : AndroidViewModel(app) {
                     absUrl              = s.absUrl,
                     absApiKey           = s.absApiKey,
                     absChapterTrackMode = s.absChapterTrackMode,
-                    loaded              = true,
                 )
             }
         }