左欄：anchor 引導 form

[wendyyuchensun]

https://www.figma.com/design/7gvWa3UzE4w5Kloy2CYGTb/%E5%B7%A5%E5%85%B7%E9%A1%9E%E8%A8%AD%E8%A8%88%E7%B3%BB%E7%B5%B1_2025?node-id=615-8030&t=81XQoWh8trjL3zSt-0