Fix black theme playback button highlighting (#314)

On the playback buttons, inverts the icon color when highlighted for
contrast.

Closes #295

<img width="518" height="109" alt="image"
src="https://github.com/user-attachments/assets/d689f347-a395-40e4-89e2-3122ab2a9e13"
/>

app/src/main/java/com/github/damontecres/wholphin/ui/playback/PlaybackControls.kt

@@ -56,13 +56,16 @@ import androidx.tv.material3.Button
 import androidx.tv.material3.ButtonDefaults
 import androidx.tv.material3.Icon
 import androidx.tv.material3.ListItem
+import androidx.tv.material3.LocalContentColor
 import androidx.tv.material3.MaterialTheme
 import androidx.tv.material3.Text
 import com.github.damontecres.wholphin.R
+import com.github.damontecres.wholphin.preferences.AppThemeColors
 import com.github.damontecres.wholphin.ui.AppColors
 import com.github.damontecres.wholphin.ui.seekBack
 import com.github.damontecres.wholphin.ui.seekForward
 import com.github.damontecres.wholphin.ui.skipStringRes
+import com.github.damontecres.wholphin.ui.theme.LocalTheme
 import com.github.damontecres.wholphin.ui.tryRequestFocus
 import com.github.damontecres.wholphin.util.ExceptionHandler
 import kotlinx.coroutines.delay
@@ -426,6 +429,7 @@ fun PlaybackButton(
     onControllerInteraction: () -> Unit,
     modifier: Modifier = Modifier,
     enabled: Boolean = true,
+    interactionSource: MutableInteractionSource? = null,
 ) {
     val selectedColor = MaterialTheme.colorScheme.border
     Button(
@@ -438,6 +442,7 @@ fun PlaybackButton(
                 focusedContainerColor = selectedColor,
             ),
         contentPadding = PaddingValues(4.dp),
+        interactionSource = interactionSource,
         modifier =
             modifier
                 .padding(4.dp)
@@ -448,7 +453,12 @@ fun PlaybackButton(
             modifier = Modifier.fillMaxSize(),
             painter = painterResource(iconRes),
             contentDescription = "",
-            tint = MaterialTheme.colorScheme.onSurface,
+            tint =
+                if (LocalTheme.current == AppThemeColors.OLED_BLACK) {
+                    LocalContentColor.current
+                } else {
+                    MaterialTheme.colorScheme.onSurface
+                },
         )
     }
 }

app/src/main/java/com/github/damontecres/wholphin/ui/theme/ThemePreview.kt

@@ -26,14 +26,17 @@ import androidx.tv.material3.MaterialTheme
 import androidx.tv.material3.NavigationDrawerScope
 import androidx.tv.material3.Text
 import androidx.tv.material3.surfaceColorAtElevation
+import com.github.damontecres.wholphin.R
 import com.github.damontecres.wholphin.preferences.AppPreference
 import com.github.damontecres.wholphin.preferences.AppThemeColors
 import com.github.damontecres.wholphin.ui.AspectRatios
 import com.github.damontecres.wholphin.ui.cards.BannerCard
 import com.github.damontecres.wholphin.ui.cards.SeasonCard
 import com.github.damontecres.wholphin.ui.cards.WatchedIcon
+import com.github.damontecres.wholphin.ui.components.ExpandableFaButton
 import com.github.damontecres.wholphin.ui.nav.NavDrawerItem
 import com.github.damontecres.wholphin.ui.nav.NavItem
+import com.github.damontecres.wholphin.ui.playback.PlaybackButton
 import com.github.damontecres.wholphin.ui.preferences.SliderPreference
 import com.github.damontecres.wholphin.ui.preferences.SwitchPreference
 import kotlinx.coroutines.flow.Flow
@@ -235,6 +238,37 @@ private fun ThemeExample(theme: AppThemeColors) {
                             )
                         }
                     }
+                    Row(
+                        horizontalArrangement = Arrangement.spacedBy(16.dp),
+                        modifier = Modifier.background(MaterialTheme.colorScheme.surfaceVariant),
+                    ) {
+                        PlaybackButton(
+                            modifier = Modifier,
+                            iconRes = R.drawable.baseline_play_arrow_24,
+                            onClick = {},
+                            onControllerInteraction = {},
+                        )
+                        PlaybackButton(
+                            modifier = Modifier,
+                            iconRes = R.drawable.baseline_play_arrow_24,
+                            onClick = {},
+                            onControllerInteraction = {},
+                            interactionSource = source,
+                        )
+                        PlaybackButton(
+                            modifier = Modifier,
+                            iconRes = R.drawable.baseline_pause_24,
+                            onClick = {},
+                            onControllerInteraction = {},
+                        )
+                        PlaybackButton(
+                            modifier = Modifier,
+                            iconRes = R.drawable.baseline_pause_24,
+                            onClick = {},
+                            onControllerInteraction = {},
+                            interactionSource = source,
+                        )
+                    }
                 }
             }
         }