feat: implement debug node

Closes #39

app/src/lib/result-viewer/Debug.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+  import { T } from '@threlte/core';
+  import type { Group } from 'three';
+  import { updateDebugScene } from './debug';
+
+  type Props = {
+    debugData?: Record<number, { type: string; data: Int32Array }>;
+  };
+
+  let group = $state<Group>(null!);
+  const { debugData }: Props = $props();
+
+  $effect(() => {
+    if (!group || !debugData) return;
+    updateDebugScene(group, $state.snapshot(debugData));
+  });
+</script>
+
+<T.Group bind:ref={group} />