- Seed items with ranks 'a0' and 'a1', drag second to top via rank 'Zz'
- Assert 'Zz' < 'a0' is true in JS (documents uppercase-before-lowercase intent)
- GET /api/lists/:id/items must return Zz-ranked item at index 0
- Fails now because MariaDB utf8mb4_uca1400_ai_ci sorts 'Zz' after 'a0'
- Will pass once rank column gets COLLATE utf8mb4_bin via migration