Examples: Add wireframe toggle to sculpt example.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mrdoob

examples/webgl_sculpt.html

@@ -78,6 +78,10 @@
 				<input type="checkbox" id="negative">
 				<label for="negative">Negative</label>
 			</div>
+			<div class="checkbox-row">
+				<input type="checkbox" id="wireframe">
+				<label for="wireframe">Wireframe</label>
+			</div>
 		</div>
 
 		<div class="cursor-circle" id="cursorCircle"></div>
@@ -192,6 +196,9 @@
 				const negativeCheckbox = document.getElementById( 'negative' );
 				negativeCheckbox.addEventListener( 'change', function () { sculpt.negative = this.checked; } );
 
+				const wireframeCheckbox = document.getElementById( 'wireframe' );
+				wireframeCheckbox.addEventListener( 'change', function () { mesh.material.wireframe = this.checked; } );
+
 				// Cursor circle
 
 				const cursorCircle = document.getElementById( 'cursorCircle' );