The rail used one fill for two meanings: the page you are on and a
filter that is on. A view, a tag and a calendar day could light three
rows like three current pages, while the view itself was never echoed
above the list.
- Split sidebarRowStateClasses into idle / current / checked. Nav pills,
settings sections and list scopes stay filled; views, tags (flat and
tree) and the selected calendar day take the checked look: foreground
text, accent icon and count, a 2px accent mark in the rail inset, no
surface.
- Echo the active view as a filter chip like a tag, and format the day
chip as a date.
- Make the tags list/tree toggle surface-free so only rows carry a fill.
- Tighten rows from 32px to 28px; nav pills keep their 32px square.
