8ba052dc81
The footer NavigationBar and slide-up panels (Color, Progress, Font & Layout) used `bg-base-200`, which is computed as a slightly-darker shade of the theme's background. In eink mode this rendered as a visible grey strip even when the user picked a pure white/black theme. Switch to `bg-base-100` in eink mode and add a `border-base-content` top border so the bar stays visually separated from the page area without relying on a tinted background, matching the existing eink treatment elsewhere (e.g. PageNavigationButtons, ImageViewer).