test(rest): bind exceljs through the typed loadExcelJs() in the import-integration suite (#13498)

The two fixture builders in `import-integration.test.ts` bound exceljs as
`const ExcelJS: any = (await import('exceljs')).default ?? (await import('exceljs'))`,
so every `new ExcelJS.Workbook()`, `addWorksheet`, `addRow` and
`wb.xlsx.writeBuffer()` downstream of them sat outside the type system. The two
tests that exercise the server-side .xlsx import path were themselves unchecked
against the dependency they drive: a renamed method or a changed arity in
exceljs would not have been a compile error here.

Both now call `loadExcelJs()` from `src/xlsx-module.ts`, the package's single
typed, lazily-loaded exceljs binding. No second accessor is introduced and no
runtime behaviour changes — only what tsc is told.


Claude-Session: https://claude.ai/code/session_01TvqBFLRzXdSPcbusDoED9k

Co-authored-by: Claude <noreply@anthropic.com>

Author: os-trump

packages/rest/src/import-integration.test.ts

@@ -27,6 +27,7 @@ import { ObjectQL } from '@objectstack/objectql';
 import { SqlDriver } from '@objectstack/driver-sql';
 import { ObjectStackProtocolImplementation } from '@objectstack/metadata-protocol';
 import { RestServer } from './rest-server';
+import { loadExcelJs } from './xlsx-module.js';
 
 // ---------------------------------------------------------------------------
 // The real backend: better-sqlite3 `:memory:`, constructed the canonical way
@@ -322,7 +323,7 @@ describe('import route — real engine + protocol integration', () => {
   });
 
   it('parses a native xlsx workbook server-side and coerces cells like csv', async () => {
-    const ExcelJS: any = (await import('exceljs')).default ?? (await import('exceljs'));
+    const ExcelJS = await loadExcelJs();
     const wb = new ExcelJS.Workbook();
     const ws = wb.addWorksheet('Sheet1');
     ws.addRow(['ID', '标题', '完成', '优先级', '分数', '截止', '负责人']);
@@ -344,7 +345,7 @@ describe('import route — real engine + protocol integration', () => {
   });
 
   it('reads xlsxBase64 without an explicit format and honors the sheet selector', async () => {
-    const ExcelJS: any = (await import('exceljs')).default ?? (await import('exceljs'));
+    const ExcelJS = await loadExcelJs();
     const wb = new ExcelJS.Workbook();
     wb.addWorksheet('Empty'); // decoy first sheet
     const ws = wb.addWorksheet('Data');