feat: harden end-to-end simulation workflow

apps/dataset-builder/index.html

@@ -19,6 +19,7 @@
           <button class="button button--ghost" id="preview-button" type="button">▶ 미리 듣기</button>
           <button class="button button--ghost" id="wav-button" type="button" title="공간정보 없이 모든 음원을 합친 mono 확인용 WAV입니다.">Preview WAV 저장</button>
           <button class="button button--primary" id="export-button" type="button">Scene JSON 저장</button>
+          <a class="button button--ghost" href="/apps/acoustic-camera/">Scene 저장 후 Camera 열기 →</a>
         </div>
       </header>
 

apps/dataset-builder/styles.css

@@ -32,6 +32,7 @@
   cursor: pointer;
   font-size: 0.82rem;
   font-weight: 720;
+  text-decoration: none;
   transition: border-color 140ms ease, background 140ms ease, transform 140ms ease;
 }