Nodes: equal() operator type casting to bool in WGSL (#26276)

* add support for meshPhongNodeMaterial

* fix typing for equal operator

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Co-authored-by: aardgoose <angus.sawyer@email.com>

examples/jsm/nodes/math/OperatorNode.js

@@ -120,7 +120,7 @@ class OperatorNode extends TempNode {
 
 				typeB = typeA;
 
-			} else if ( op === '<' || op === '>' || op === '<=' || op === '>=' ) {
+			} else if ( op === '<' || op === '>' || op === '<=' || op === '>=' || op === '==' ) {
 
 				if ( builder.isVector( typeA ) ) {