Tests were written against the pre-Stream B flat settings page. After
the left-nav restructure (bd6a301) and the management-surfaces revamp,
the Display section's IDs are only in the DOM once the user navigates
there, and renderSettings makes additional sendMessage calls (is_unlocked,
per-section data) that the original mocks didn't cover.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>