Add excel_service.read_all_rows (every valid data row, status-independent) and
use it in _reload_sample_rows for the preview dropdown, so previewing still
works after the whole sheet is 完成. Generation still uses load_outfit_tasks.
+1 excel test (read_all_rows includes 完成/失败, skips incomplete); offscreen
all-完成 sheet now yields sample rows; full suite (12) green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
adminandClaude Opus 4.8