Theme + accent settings now apply live (were decorative: ShonarTheme ignored them)

android/app/src/main/java/com/shonar/MainActivity.kt

@@ -49,7 +49,7 @@ class MainActivity : ComponentActivity() {
         }
         routeIntent(intent)
         setContent {
-            ShonarTheme {
+            ShonarTheme(settingsManager = (application as com.shonar.ShonarApplication).settingsManager) {
                 val nav = rememberNavController()
                 Surface(
                     modifier = Modifier.fillMaxSize(),

android/app/src/main/java/com/shonar/ui/theme/Theme.kt

@@ -5,7 +5,15 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.darkColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.luminance
+import com.shonar.settings.SettingsManager
 
 // SHONAR palette — deep-sea sonar: dark navy + teal ping.
 private val Teal = Color(0xFF4FD1C5)
@@ -14,29 +22,50 @@ private val DeepNavy = Color(0xFF0B1220)
 private val NavySurface = Color(0xFF121C2E)
 private val Ink = Color(0xFF10141A)
 
-private val DarkScheme = darkColorScheme(
-    primary = Teal,
-    onPrimary = Ink,
-    secondary = TealDark,
+private fun schemeFor(accent: Color, dark: Boolean) = if (dark) {
+    darkColorScheme(
+        primary = accent,
+        onPrimary = if (accent.luminance() > 0.4) Ink else Color.White,
+        secondary = accent.copy(alpha = 0.8f),
         background = DeepNavy,
         surface = NavySurface,
         onBackground = Color(0xFFE6EDF3),
         onSurface = Color(0xFFE6EDF3),
-)
-
-private val LightScheme = lightColorScheme(
-    primary = TealDark,
-    onPrimary = Color.White,
-    secondary = Teal,
-)
+    )
+} else {
+    lightColorScheme(
+        primary = accent,
+        onPrimary = if (accent.luminance() > 0.4) Ink else Color.White,
+        secondary = accent.copy(alpha = 0.8f),
+    )
+}
 
+/**
+ * Live appearance: reads theme_mode + accent_color and recomposes whenever
+ * either changes (SettingsManager.valuesChanged bumps on every setValue).
+ * "System" defers to isSystemInDarkTheme(). Both settings used to be
+ * decorative — MainActivity called ShonarTheme() with no arguments.
+ */
 @Composable
 fun ShonarTheme(
-    darkTheme: Boolean = isSystemInDarkTheme(),
+    settingsManager: SettingsManager,
     content: @Composable () -> Unit,
 ) {
+    var accent by remember { mutableStateOf(Teal) }
+    var darkOverride by remember { mutableStateOf<Boolean?>(null) }
+    val version = settingsManager.valuesChanged.collectAsState()
+    LaunchedEffect(version.value) {
+        runCatching { settingsManager.ensureLoaded() }
+        accent = parseColor(settingsManager.string("accent_color"))
+        darkOverride = when (settingsManager.string("theme_mode")) {
+            "Light" -> false
+            "Dark" -> true
+            else -> null
+        }
+    }
+    val dark = darkOverride ?: isSystemInDarkTheme()
     MaterialTheme(
-        colorScheme = if (darkTheme) DarkScheme else LightScheme,
+        colorScheme = schemeFor(accent, dark),
         content = content,
     )
 }