Respect theme enforceNavigationBarContrast attribute (#56413)

Summary:
This PR adds respect of the theme's `enforceNavigationBarContrast` attribute in `WindowUtil` `enableEdgeToEdge` (this will allow us to delete our [EdgeToEdgePackage.kt](https://github.com/expo/expo/blob/main/packages/expo-modules-core/android/src/main/java/expo/modules/kotlin/edgeToEdge/EdgeToEdgePackage.kt) file, and prevent a glitch where the navigation bar is semi-opaque for a short instant when user explicitly set `android:enforceNavigationBarContrast` to `false`).

## Changelog:

[ANDROID] [CHANGED] - Respect theme `enforceNavigationBarContrast` attribute

Pull Request resolved: #56413

Test Plan:
- Verified edge-to-edge rendering on API 30+ (transparent status/navigation bars, correct display cutout behavior).
- Verified navigation bar contrast enforcement respects the theme attribute on API 29+ (with `android:enforceNavigationBarContrast` to `true` (default) and `false`).
- Verified fallback navigation bar colors on API 26-28 (light/dark scrim) and API < 26 (dark scrim).

Additional screenshots are found here: #56413 (comment)

Reviewed By: cipolleschi

Differential Revision: D100384656

Pulled By: alanleedev

fbshipit-source-id: 570323408c788d58d1249671a2b19c8539815d00

Author: zoontek

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/view/WindowUtil.kt

@@ -106,23 +106,37 @@ private fun Window.statusBarShow() {
 internal fun Window.enableEdgeToEdge() {
   WindowCompat.setDecorFitsSystemWindows(this, false)
 
+  val insetsController = WindowInsetsControllerCompat(this, decorView)
   val isDarkMode = UiModeUtils.isDarkMode(context)
 
+  statusBarColor = Color.TRANSPARENT
+
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+    navigationBarColor = Color.TRANSPARENT
+
+    val attributes = intArrayOf(android.R.attr.enforceNavigationBarContrast)
+    val typedArray = context.theme.obtainStyledAttributes(attributes)
+
+    val enforceNavigationBarContrast =
+        try {
+          typedArray.getBoolean(0, true)
+        } finally {
+          typedArray.recycle()
+        }
+
     isStatusBarContrastEnforced = false
-    isNavigationBarContrastEnforced = true
-  }
+    isNavigationBarContrastEnforced = enforceNavigationBarContrast
 
-  statusBarColor = Color.TRANSPARENT
-  navigationBarColor =
-      when {
-        Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q -> Color.TRANSPARENT
-        Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !isDarkMode -> LightNavigationBarColor
-        else -> DarkNavigationBarColor
-      }
-
-  WindowInsetsControllerCompat(this, decorView).run {
-    isAppearanceLightNavigationBars = !isDarkMode
+    if (enforceNavigationBarContrast) {
+      insetsController.isAppearanceLightNavigationBars = !isDarkMode
+    }
+  } else {
+    val isAppearanceLightNavigationBars =
+        Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !isDarkMode
+
+    navigationBarColor =
+        if (isAppearanceLightNavigationBars) LightNavigationBarColor else DarkNavigationBarColor
+    insetsController.isAppearanceLightNavigationBars = isAppearanceLightNavigationBars
   }
 
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {