test(application): bump exceljs row/column-limit test timeouts to 60s

Run #115 on main timed out after 30s on the Gitea runner under
concurrent-job load (writing 10001 rows via ExcelJS addRow + writeFile
is CPU-bound and CI contention pushed it past the previous threshold).
Locally these tests complete in ~1s, so doubling the budget removes
the flake without masking real regressions.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packages/application/src/__tests__/read-workbook.test.ts

@@ -137,7 +137,7 @@ describe("readWorksheetMatrix", () => {
     await expect(readWorksheetMatrix(workbookPath, "Sheet1")).rejects.toThrow(
       `exceeds the ${MAX_DISPO_WORKBOOK_ROWS} row import limit`,
     );
-  }, 30000);
+  }, 60000);
 
   it("rejects worksheets that exceed the column limit", async () => {
     const directory = await makeTempDirectory();
@@ -149,7 +149,7 @@ describe("readWorksheetMatrix", () => {
     await expect(readWorksheetMatrix(workbookPath, "Sheet1")).rejects.toThrow(
       `exceeds the ${MAX_DISPO_WORKBOOK_COLUMNS} column import limit`,
     );
-  }, 30000);
+  }, 60000);
 
   describe("DISPO_IMPORT_DIR allowlist", () => {
     it("rejects absolute paths that escape the configured import dir", async () => {