Update landing page and ground link features

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

랜딩페이지/drawing-popup.ts

@@ -67,6 +67,7 @@ export function createDrawingPopup(root: HTMLElement, beforeOpen: () => void): {
         window.setTimeout(() => URL.revokeObjectURL(url), 1000);
       } else {
         if (!window.loadBytesToApp) throw new Error('교각 Excel 가져오기를 찾을 수 없습니다.');
+        window.dispatchEvent(new CustomEvent('pierzainer:ground-source',{detail:{name:book.fileName,bytes,folder:job.folder}}));
         window.loadBytesToApp(bytes, book.fileName);
         const name = document.querySelector<HTMLInputElement>('#project-name')!;
         const bridge = document.querySelector<HTMLInputElement>('#bridge-name')!;