fix(database): expose submitCreate on window.__lib in library browser

新建根目录/子节点弹窗的「创建」按钮 onclick 调 window.__lib.submitCreate,
但该函数虽已定义却漏挂到 __lib 导出表,导致点击报 "submitCreate is not
a function"。补挂即可。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

hub/src/database/routes/libraryBrowser.ts

@@ -574,6 +574,7 @@ export function renderLibraryBrowser(): string {
         ok("已收回"); renderTab();
       } catch (e) { fail(e); }
     },
+    submitCreate,
     newFileDialog, submitNewFile, openFile, closePreview, saveFile, deleteFile, showHistory,
     acceptLatest() { openFile(currentFile.path); toast("已载入最新内容,请在此基础上合并", "info"); },
     submitExport, closeModal,