model3d ply freeze fix (#13288)

* fix

* add changeset

* changes

* fix

* fix headers

* fix

* format

* remove tests

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>

Author: dawoodkhan82

.changeset/purple-states-burn.md

@@ -0,0 +1,6 @@
+---
+"@gradio/model3d": patch
+"gradio": patch
+---
+
+fix:`model3d` ply freeze fix

js/model3D/shared/Canvas3DGS.svelte

@@ -18,10 +18,10 @@
 	let canvas: HTMLCanvasElement;
 	let scene: SPLAT.Scene;
 	let camera: SPLAT.Camera;
-	let renderer = $state<SPLAT.WebGLRenderer | null>(null);
+	let renderer: SPLAT.WebGLRenderer | null = null;
 	let controls: SPLAT.OrbitControls;
 	let mounted = $state(false);
-	let frameId = $state<number | null>(null);
+	let frameId: number | null = null;
 
 	function reset_scene(): void {
 		if (frameId !== null) {