Revert "frontend: multiplexer: add typeof guards for WebSocket global references"

This reverts commit 8e76184.

Author: Kaniikura

frontend/src/lib/k8s/api/v2/multiplexer.ts

@@ -76,18 +76,15 @@ export const WebSocketManager = {
    */
   async connect(): Promise<WebSocket> {
     // Return existing connection if available
-    if (typeof WebSocket !== 'undefined' && this.socketMultiplexer?.readyState === WebSocket.OPEN) {
+    if (this.socketMultiplexer?.readyState === WebSocket.OPEN) {
       return this.socketMultiplexer;
     }
 
     // Wait for existing connection attempt if in progress
     if (this.connecting) {
       return new Promise(resolve => {
         const checkConnection = setInterval(() => {
-          if (
-            typeof WebSocket !== 'undefined' &&
-            this.socketMultiplexer?.readyState === WebSocket.OPEN
-          ) {
+          if (this.socketMultiplexer?.readyState === WebSocket.OPEN) {
             clearInterval(checkConnection);
             resolve(this.socketMultiplexer);
           }
@@ -237,10 +234,7 @@ export const WebSocketManager = {
             this.activeSubscriptions.delete(key);
             this.completedPaths.delete(key);
 
-            if (
-              typeof WebSocket !== 'undefined' &&
-              this.socketMultiplexer?.readyState === WebSocket.OPEN
-            ) {
+            if (this.socketMultiplexer?.readyState === WebSocket.OPEN) {
               const userId = getUserIdFromLocalStorage();
               const closeMsg: WebSocketMessage = {
                 clusterId,