fix(widget): Sync window background with Compose theme in config activity

The widget configuration activity used enableEdgeToEdge() but never synced the Android window background with the Compose Material theme. When the system dark/light mode disagreed with the app's theme setting, text became invisible (dark on dark). Also extend the bottom bar Surface under the navigation bar to eliminate the white gap.

app/src/main/java/eu/darken/capod/main/ui/widget/WidgetConfigurationActivity.kt

@@ -7,8 +7,13 @@ import android.os.Bundle
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.viewModels
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.SideEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.ui.graphics.luminance
+import androidx.compose.ui.graphics.toArgb
+import androidx.core.view.WindowCompat
 import dagger.hilt.android.AndroidEntryPoint
 import dagger.hilt.android.qualifiers.ApplicationContext
 import eu.darken.capod.common.compose.waitForState
@@ -53,6 +58,15 @@ class WidgetConfigurationActivity : Activity2() {
         setContent {
             val themeState by generalSettings.themeState.collectAsState(initial = generalSettings.currentThemeState)
             CapodTheme(state = themeState) {
+                val backgroundColor = MaterialTheme.colorScheme.background
+                val useDarkIcons = backgroundColor.luminance() > 0.5f
+                SideEffect {
+                    window.decorView.setBackgroundColor(backgroundColor.toArgb())
+                    val insetsController = WindowCompat.getInsetsController(window, window.decorView)
+                    insetsController.isAppearanceLightStatusBars = useDarkIcons
+                    insetsController.isAppearanceLightNavigationBars = useDarkIcons
+                }
+
                 val state by waitForState(vm.state)
                 state?.let { currentState ->
                     WidgetConfigurationScreen(

app/src/main/java/eu/darken/capod/main/ui/widget/WidgetConfigurationScreen.kt

@@ -31,6 +31,8 @@ import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.WindowInsetsSides
+import androidx.compose.foundation.layout.only
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
@@ -113,7 +115,7 @@ fun WidgetConfigurationScreen(
     Column(
         modifier = Modifier
             .fillMaxSize()
-            .windowInsetsPadding(WindowInsets.systemBars),
+            .windowInsetsPadding(WindowInsets.systemBars.only(WindowInsetsSides.Top + WindowInsetsSides.Horizontal)),
     ) {
         Column(
             modifier = Modifier
@@ -326,7 +328,7 @@ fun WidgetConfigurationScreen(
 
         // Bottom bar
         Surface(tonalElevation = 3.dp) {
-            Column {
+            Column(modifier = Modifier.windowInsetsPadding(WindowInsets.systemBars.only(WindowInsetsSides.Bottom))) {
                 if (!state.isPro) {
                     Text(
                         text = stringResource(R.string.common_feature_requires_pro_msg),