Design pass on the web UI: amber for new, EQ bars, keyboard feed list

Works through TODO.md from the 2026-09-11 review. Unread badges, dots and
download bars take the icon's amber; the playing item is marked by EQ bars
that move only while it plays. The feed list is usable from the keyboard,
focus rings show everywhere, and folders get a mosaic of their shows' art
with the triangle hung in the margin. Sentence-case labels, fewer bold
weights, tinted initials tiles, shorter header lines, "Kept" everywhere,
and the list gets the room the empty panes had. Reduced motion is honoured.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TAC7sLVqfKmY6rsTLXzNgk

src/web.rs

@@ -1196,9 +1196,9 @@ async fn delete_file(
         let complaint = match (starred, unread) {
             (0, 0) => None,
             (0, u) => Some(format!("{} subscribed to this feed {} not played it yet", people(u), if u == 1 { "has" } else { "have" })),
-            (st, 0) => Some(format!("another {} starred it to keep", people(st))),
+            (st, 0) => Some(format!("another {} kept it", people(st))),
             (st, u) => Some(format!(
-                "another {} starred it to keep, and {} not played it yet",
+                "another {} kept it, and {} not played it yet",
                 people(st),
                 if u == 1 { "one person has".to_string() } else { format!("{u} have") }
             )),