One Check every feed button: the top bar's (#416)

All Subscriptions' header had its own, beside Mark everything read, doing
what the top bar's Refresh does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RqkrVDqdiQEMWAkNGQ2tYA

web/src/feeds.ts

@@ -64,7 +64,7 @@ function paintScanning(){
   const self=spinFeed!==null&&spinFeed===S.feed, any=document.body.classList.contains('scan-any');
   document.body.classList.toggle('scan-this',self);
   // Turning was all that said a check was running, and with motion reduced nothing turns (#310).
-  for(const b of $$('#scanAll,.fhead [data-a=scanall],.fhead [data-a=scan]')){
+  for(const b of $$('#scanAll,.fhead [data-a=scan]')){
     const on=b.dataset.a==='scan'?self:any;
     b.dataset.label??=b.getAttribute('aria-label')!;
     if(on) b.setAttribute('aria-busy','true'); else b.removeAttribute('aria-busy');