fix(utils): simplify WebGL context detection logic

Remove instanceof WebGLRenderingContext check which was too restrictive.
The getContext() method already returns null if WebGL is not supported,
making the instanceof check unnecessary. This also properly supports
WebGL2RenderingContext detection.

Author: lsustc

src/utils/webglDetect.ts

@@ -16,7 +16,7 @@ export function isWebGLSupported(): boolean {
     const gl = canvas.getContext('webgl2') || canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
 
     // If we got a context, WebGL is supported
-    if (gl && gl instanceof WebGLRenderingContext) {
+    if (gl) {
       return true;
     }