fix(android): override RN edge-to-edge nav bar contrast enforcement

React Native 0.84's enableEdgeToEdge() sets isNavigationBarContrastEnforced
to true, causing a white scrim on the nav bar (visible on Xiaomi/HyperOS).
Override it after super.onCreate() to ensure transparent nav bar on all
build variants.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ignaciosantise

wallets/rn_cli_wallet/android/app/src/main/java/com/walletconnect/web3wallet/rnsample/MainActivity.kt

@@ -4,7 +4,10 @@ import com.facebook.react.ReactActivity
 import com.facebook.react.ReactActivityDelegate
 import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.fabricEnabled
 import com.facebook.react.defaults.DefaultReactActivityDelegate
+import android.graphics.Color
+import android.os.Build
 import android.os.Bundle
+import androidx.core.view.WindowCompat
 import com.zoontek.rnbootsplash.RNBootSplash
 
 class MainActivity : ReactActivity() {
@@ -25,5 +28,13 @@ class MainActivity : ReactActivity() {
   override fun onCreate(savedInstanceState: Bundle?) {
     RNBootSplash.init(this, R.style.BootTheme) // ⬅️ initialize the splash screen
     super.onCreate(savedInstanceState)
+
+    // Enable edge-to-edge and set transparent nav/status bars for all build variants
+    WindowCompat.setDecorFitsSystemWindows(window, false)
+    window.statusBarColor = Color.TRANSPARENT
+    window.navigationBarColor = Color.TRANSPARENT
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+      window.isNavigationBarContrastEnforced = false
+    }
   }
 }