Fixed Design

Dark mode: fixed low-contrast fields and a white flash on load

Inline-edit fields now use the correct text color in dark mode, and pages with dark mode pinned no longer flash white while loading.

An inline-edit field, such as the account email on the Data Removal review page, could render its text in low contrast against a dark background. Pages loaded with dark mode explicitly selected could also briefly flash white before the dark background applied. Both are fixed.