fix: close final viewer integration gaps (#5)

apps/viewer-2d-sample/src/main.ts

@@ -23,8 +23,8 @@
 import {
   createViewer2D,
   isCad2DFile,
-  parseCad,
-  type CadParseResult,
+  loadCad,
+  type CadLoadSummary,
 } from '@hmwebviewer/viewer2d';
 import {
   assertCadByteLength,
@@ -71,11 +71,8 @@ viewer.onSelect((entity: unknown) => {
 });
 
 // ── ④ 파서 조합 ─────────────────────────────────────────────────
-async function loadAndRender(buf: ArrayBuffer, name: string): Promise<CadParseResult> {
-  const result = await parseCad({ data: buf, name });
-  viewer.load(result);
-  viewer.resize();
-  return result;
+async function loadAndRender(buf: ArrayBuffer, name: string): Promise<CadLoadSummary> {
+  return loadCad(viewer, { data: buf, name });
 }
 
 async function loadUrl(url: string, nameHint?: string) {
@@ -117,13 +114,13 @@ function fillLayers() {
   }
 }
 
-async function afterLoad(name: string, result: CadParseResult) {
-  setStatus(`✓ ${name} · ${result.entities?.length ?? 0} entities`);
+async function afterLoad(name: string, result: CadLoadSummary) {
+  setStatus(`✓ ${name} · ${result.entityCount} entities`);
   fillLayers();
   viewer.fit();
 }
 
-async function run(label: string, job: () => Promise<CadParseResult>) {
+async function run(label: string, job: () => Promise<CadLoadSummary>) {
   setStatus(`loading ${label}…`);
   try {
     await afterLoad(label, await job());