Signal counts kept current on the page: after a read, and when Jev picks something out (#258)

The page fetched the Signals' unread counts only with the feed list, so reading an item, here or
in its own feed, left its Signal's badge as it was, and so did Jev adding one. The Apple Signal said
2 unread over a page with none. The page now fetches them again after a read or unread lands, and
on a new signal_hits event, which the judge sends once a pass for each person it found items for.

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

web/src/items.ts

@@ -275,7 +275,7 @@ function setRead(e: Entry,read: boolean){
   const w: {read: boolean, done?: number}={read}; readWrites.set(readKey(e),w);
   return api(`/api/entries/${encodeURIComponent(e.feed_id)}/${encodeURIComponent(e.guid)}/flags`,
       {method:'POST',body:JSON.stringify({read})})
-    .then(row=>{ w.done=performance.now(); if(row) patchFeed(row); });
+    .then(row=>{ w.done=performance.now(); if(row) patchFeed(row); if(S.signals.length) refreshSignals(); });
 }
 
 /// Opening an item is reading it. The row is redrawn where it stands rather than the list