Add Android OAuth support and fix map camera crash

- Add appAuthRedirectScheme manifest placeholder for flutter_appauth on Android
- Fix Google Maps camera animation crash on Android ("No valid view found")
- Add safety checks and retry mechanism for camera initialization
- Make action buttons always visible regardless of delivery selection

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

android/app/build.gradle.kts

@@ -24,10 +24,13 @@ android {
         applicationId = "com.goutezplanb.planb_logistic"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
-        minSdk = 23  // Required for Google Navigation Flutter
+        minSdk = flutter.minSdkVersion  // Required for Google Navigation Flutter
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
         versionName = flutter.versionName
+
+        // OAuth redirect scheme for flutter_appauth
+        manifestPlaceholders["appAuthRedirectScheme"] = "com.goutezplanb.delivery"
     }
 
     packagingOptions {