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

docs/users.md

@@ -8,7 +8,7 @@ fetch, one parse and one file.
 
 | Yours alone | The same for everyone |
 |---|---|
-| Read, starred, playback position | The feed's URL |
+| Read, kept, playback position | The feed's URL |
 | Which feeds you see at all | Its download folder |
 | Keywords, auto-download, explicit, per-scan cap | When it is scanned |
 | | The file on disk |
@@ -34,10 +34,10 @@ is shared.
 
 Deleting a file deletes everyone's copy. A feed with other subscribers labels the button **Delete
 for everyone** and names them in the confirmation, and the server has the last word: if anyone else
-has starred the item or not played it yet, `DELETE /api/enclosures/{id}` answers `409` with the
+has kept the item or not played it yet, `DELETE /api/enclosures/{id}` answers `409` with the
 reason, and only `?force=true` goes through.
 
-Retention follows the same rule: starred by anyone keeps a file, and it counts as read only once
+Retention follows the same rule: an item anyone kept keeps its file, and it counts as read only once
 every subscriber has read it.
 
 ## Signing in