Fix Android back button closing app instead of navigating back in WebView (#52)

onBackPressed() is deprecated and no longer called on Android 13+
(targetSdkVersion 36). Replace with OnBackPressedCallback registered
on OnBackPressedDispatcher so the WebView back navigation works with
the modern back gesture system.

https://claude.ai/code/session_01N8qksHxWt2qBSM6SYPUiss

Co-authored-by: Claude <noreply@anthropic.com>

Author: RickyNotaro

APK/android/app/src/main/java/com/communauto/tools/MainActivity.java

@@ -2,22 +2,26 @@
 
 import android.os.Bundle;
 import android.webkit.WebView;
+import androidx.activity.OnBackPressedCallback;
 import com.getcapacitor.BridgeActivity;
 
 public class MainActivity extends BridgeActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         registerPlugin(WebViewCookiePlugin.class);
         super.onCreate(savedInstanceState);
-    }
 
-    @Override
-    public void onBackPressed() {
-        WebView webView = getBridge().getWebView();
-        if (webView.canGoBack()) {
-            webView.goBack();
-        } else {
-            super.onBackPressed();
-        }
+        getOnBackPressedDispatcher().addCallback(this, new OnBackPressedCallback(true) {
+            @Override
+            public void handleOnBackPressed() {
+                WebView webView = getBridge().getWebView();
+                if (webView.canGoBack()) {
+                    webView.goBack();
+                } else {
+                    setEnabled(false);
+                    getOnBackPressedDispatcher().onBackPressed();
+                }
+            }
+        });
     }
 }