fix(theme): text on glass holds 4.5:1 — light --muted kept at 6:1 on the page, tonal fills opaque

Pixel-measured over every scheme x mode x backdrop: the item count fell to 3.8:1 (dark too: its 8%
fill let the toolbar glass and the thumbnails under it through), Channels' tabs to 4.1:1 and the
current Files row to 4.4:1. Light --muted moves 15% toward --fg in every scheme; the badges, the item
count and the current rail row paint opaque bg-tint* fills mixed into the surface. The token contract
now asks 6:1 of --muted on the bare page and checks those three sites use the tints.

frontend/src/components/FilesRail.tsx

@@ -63,7 +63,7 @@ function Entry({
       onClick={() => setView(view)}
       className={clsx(
         "flex w-full min-h-8 items-center gap-2 rounded-lg px-2 text-sm",
-        active ? "bg-accent/12 font-medium text-accent" : "text-fg",
+        active ? "bg-tint-current font-medium text-accent" : "text-fg",
       )}
     >
       <Icon className={clsx("size-4 shrink-0", !active && "text-muted")} />