fix(theme): drive system bar icons from the in-app light/dark choice (#70)

app/src/main/java/de/jeanlucmakiola/calendula/MainActivity.kt

@@ -5,6 +5,7 @@ import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
 import android.provider.CalendarContract
+import androidx.activity.SystemBarStyle
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
@@ -12,6 +13,7 @@ import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -50,6 +52,10 @@ import kotlinx.datetime.toLocalDateTime
 import kotlin.time.Clock
 import kotlin.time.Instant
 
+// The nav-bar scrims androidx's own enableEdgeToEdge() defaults to.
+private val LIGHT_NAV_SCRIM = android.graphics.Color.argb(0xe6, 0xFF, 0xFF, 0xFF)
+private val DARK_NAV_SCRIM = android.graphics.Color.argb(0x80, 0x1b, 0x1b, 0x1b)
+
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
 
@@ -113,6 +119,22 @@ class MainActivity : AppCompatActivity() {
                 ThemeMode.LIGHT -> false
                 ThemeMode.DARK -> true
             }
+            // The bare enableEdgeToEdge() in onCreate reads the night resource
+            // qualifier, not the in-app override — re-apply it from the resolved
+            // theme so the bar icons follow the app's light/dark choice.
+            DisposableEffect(darkTheme) {
+                enableEdgeToEdge(
+                    statusBarStyle = SystemBarStyle.auto(
+                        android.graphics.Color.TRANSPARENT,
+                        android.graphics.Color.TRANSPARENT,
+                    ) { darkTheme },
+                    navigationBarStyle = SystemBarStyle.auto(
+                        LIGHT_NAV_SCRIM,
+                        DARK_NAV_SCRIM,
+                    ) { darkTheme },
+                )
+                onDispose {}
+            }
             // The app-wide clock convention: the time-format preference resolved
             // against the device's 24-hour system setting, provided once here so
             // every time label reads it via LocalUse24HourFormat.