Implement search for the materials

[unrealsolver]

Implement this function:

beam-calculator/frontapp/src/Options/Material.svelte

Lines 29 to 35 in bec8936

	function new_filter(items, query) {
	return items.map((d, idx) => ({
	id: idx,
	text: d.name,
	children: null,
	}))
	}

Should have a nested structure: standard.category.subcategory.name