feat: enhance WebSocket close event handling

- Updated `WebSocketInstance.onClosed` to send a structured close event with code and reason.
- Modified JavaScript event handling to properly receive and process the close event data.

Author: UnschooledGamer

src/plugins/websocket/src/android/WebSocketInstance.java

@@ -6,6 +6,7 @@
 
 import org.apache.cordova.*;
 import org.json.JSONArray;
+import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.util.Iterator;
@@ -130,8 +131,15 @@ public void onClosing(@NonNull WebSocket webSocket, int code, @NonNull String re
     @Override
     public void onClosed(@NonNull WebSocket webSocket, int code, @NonNull String reason) {
         this.readyState = 3; // CLOSED
-        sendEvent("close", reason);
         Log.i("WebSocketInstance", "websocket instanceId=" + this.instanceId + " Closed code: " + code + " reason: " + reason);
+        JSONObject closedEvent = new JSONObject();
+        try {
+            closedEvent.put("code", code);
+            closedEvent.put("reason", reason);
+        } catch (JSONException e) {
+            Log.e("WebSocketInstance", "Error creating close event", e);
+        }
+        sendEvent("close", closedEvent.toString());
     }
 
     @Override

src/plugins/websocket/www/websocket.js

@@ -20,7 +20,7 @@ class WebSocketInstance {
             if (event.type === 'message' && this.onmessage) this.onmessage.bind(this)(event);
             if (event.type === 'close') {
                 this.readyState = WebSocketInstance.CLOSED;
-                if (this.onclose) this.onclose.bind(this)(event);
+                if (this.onclose) this.onclose.bind(this)({ code: event?.data?.code, reason: event?.data?.reason, type: event.type });
             }
             if (event.type === 'error' && this.onerror) this.onerror.bind(this)(event);
         }, null, "WebSocketPlugin", "registerListener", [this.instanceId]);