Keep a feed, an OPML or a Patreon creator out of All Subscriptions (#288)

A switch in the feed's settings, In All Subscriptions, on its
subscription as hide_from_all. All Subscriptions' list and count leave
out a feed hidden on its own or through the OPML it is in, and the page's
unread count does the same. Signals read every feed as before, and
Currently Listening, which is All Subscriptions' in-progress filter, keeps
an episode under way whatever the feed's setting.

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

web/src/feedpage.ts

@@ -14,7 +14,7 @@ function renderFeed(){
   const name=f?(f.title||f.id):sg?sg.name:v.title;
   $<HTMLInputElement>('#epSearch').placeholder=`Search ${name}…`;
   const kids=f?S.feeds.filter(c=>c.group===f.id):[];
-  const unreadAll=S.feeds.reduce((n,x)=>n+(x.unread||0),0);
+  const unreadAll=unreadInAll();
   box.innerHTML = (f&&kids.length ? groupHead(f,kids) : f ? `
     <div class="fhead slim">
       ${artHTML(f.image,name)}