Refactor useEffect dependencies in PreviewComponent

[Atlessc]

fixed issue #9

approach:

removed the "color" state from the first useEffect dependency at Line 77 and added the code below to set the material color when the color state changes when a user clicks a color in the ColorPicker component:

	const updateMaterialColor = (hexColor: number) => {
		if (meshRef.current) {
			const material = new THREE.MeshStandardMaterial({ color: hexColor });
			meshRef.current.material = material;
		}
	};

	useEffect(() => {
		if (modelLoaded) {
			updateMaterialColor(parseInt(color.replace("#", ""), 16));
		}
	}, [color]);

tested the new changes in local env, network showing only the one fetch for the model, helping reduce api requests by 90%.

[benhalverson]