Update display-*, look-* pages
prefs-display: landing page refresh, add Problems layout copied from media.page which needed a "trail" revised
look-background: background panel is now called Appearance, with Style and Background sections Style can be set to Light or Dark (add page? "dark style preference") Some wallpapers note: small clock icon is now bottom left Files (works), Image Viewer (works)
display-night-light: Night Light is at the bottom of the panel, not in the header bar
display-dual-monitors: Single Display under Display Modes is gone, replaced with switch in the panel for each monitor
look-display-fuzzy.page: change search to Displays panel