Signals in a folder of their own in the feed list, as an OPML's feeds are (#255)

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

web/src/items.ts

@@ -72,7 +72,7 @@ function preloadLists(){
 /// `quiet` for a refresh nobody asked for (a live update): not a wait anyone sees, so not timed.
 async function loadEntries(append?: boolean, quiet?: boolean){
   // The Directory lists feeds, and Currently Listening draws its own episodes.
-  if(!S.feed || VIEWS[S.feed]?.url) return;
+  if(!S.feed || VIEWS[S.feed]?.url || S.feed===SIGNALS) return;
   const feed=S.feed, key=listKey(feed), asked=performance.now(), seq=++loadSeq;
   // From asking to the list drawn: what someone waits for after a click, under that click's trace
   // (#246). Once, when the list first shows: from what is kept, at once.