Fix crash in RCTWebSocketModule when delegate callbacks fire after module invalidation (facebook#55858)

Summary:
Guard against nil socketID in all SRWebSocketDelegate callbacks in RCTWebSocketModule.

When the module is invalidated during teardown, invalidate nils the delegate and closes each socket. However, SocketRocket's network thread may have already dispatched a delegate callback to the main queue via setDelegateDispatchQueue:. By the time the block executes, the SRWebSocket has been deallocated and reactTag (an associated object) returns nil, causing either an objc_retain crash on a dangling pointer or an NSInvalidArgumentException when inserting nil into an NSDictionary literal.

The didFailWithError: callback already had a partial nil guard (socketID ?: @(-1)), but didCloseWithCode:, webSocketDidOpen:, and didReceiveMessage: did not. This adds consistent early-return nil checks to all four callbacks.
Previously reported in facebook#28278, facebook#29525, and facebook#31048 — all closed by the stale bot without a fix being merged.

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[IOS] [FIXED] - Fix crash in RCTWebSocketModule when delegate callbacks fire after module invalidation

Pull Request resolved: facebook#55858

Test Plan: This is a race condition during module teardown that is difficult to reproduce deterministically — it surfaces in production Crashlytics reports (< 0.1% of sessions). The fix is a nil guard matching the defensive pattern already present in didFailWithError:.

Reviewed By: javache

Differential Revision: D95056045

Pulled By: cipolleschi

fbshipit-source-id: 02d715dfdf1816b5366ec077849d560133a857c8

Author: lukeharvey

packages/react-native/React/CoreModules/RCTWebSocketModule.mm

@@ -166,6 +166,9 @@ - (void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message
   NSString *type;
 
   NSNumber *socketID = [webSocket reactTag];
+  if (!socketID) {
+    return;
+  }
   id contentHandler = _contentHandlers[socketID];
   if (contentHandler) {
     message = [contentHandler processWebsocketMessage:message forSocketID:socketID withType:&type];
@@ -178,18 +181,25 @@ - (void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message
     }
   }
 
-  [self sendEventWithName:@"websocketMessage" body:@{@"data" : message, @"type" : type, @"id" : webSocket.reactTag}];
+  [self sendEventWithName:@"websocketMessage" body:@{@"data" : message, @"type" : type, @"id" : socketID}];
 }
 
 - (void)webSocketDidOpen:(SRWebSocket *)webSocket
 {
+  NSNumber *socketID = [webSocket reactTag];
+  if (!socketID) {
+    return;
+  }
   [self sendEventWithName:@"websocketOpen"
-                     body:@{@"id" : webSocket.reactTag, @"protocol" : webSocket.protocol ? webSocket.protocol : @""}];
+                     body:@{@"id" : socketID, @"protocol" : webSocket.protocol ? webSocket.protocol : @""}];
 }
 
 - (void)webSocket:(SRWebSocket *)webSocket didFailWithError:(NSError *)error
 {
   NSNumber *socketID = [webSocket reactTag];
+  if (!socketID) {
+    return;
+  }
   _contentHandlers[socketID] = nil;
   _sockets[socketID] = nil;
   NSDictionary *body =
@@ -203,6 +213,9 @@ - (void)webSocket:(SRWebSocket *)webSocket
             wasClean:(BOOL)wasClean
 {
   NSNumber *socketID = [webSocket reactTag];
+  if (!socketID) {
+    return;
+  }
   _contentHandlers[socketID] = nil;
   _sockets[socketID] = nil;
   [self sendEventWithName:@"websocketClosed"