A feed's refresh button looks like its neighbours (#76)

The check-now button on a feed's page, a folder's page and All
Subscriptions was class primary, drawn filled in the accent colour among
plain buttons. Primary stays for a dialog's confirm button; the rules
that only the feed pages used go with it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/app.css

@@ -727,9 +727,7 @@ input:focus,select:focus{outline:0;border-color:var(--accent)}
 .acts{display:flex;gap:7px;flex-wrap:wrap;align-items:center;margin-top:auto}
 .acts .btn{display:inline-flex;align-items:center;gap:6px;padding:7px 13px;border-radius:999px}
 .acts .btn i{font-style:normal;font-size:13px;line-height:1;opacity:.7}
-.acts .btn.primary i{opacity:.9}
 .acts .btn:hover{background:var(--raise)}
-.acts .btn.primary:hover{background:var(--accent)}
 .btn{
   background:var(--panel2);border:1px solid var(--line);border-radius:8px;
   padding:6px 12px;font-size:13px;