Keep a feed out of Signals, and a feed's settings in named parts (#289, #290)

hide_from_signals on a subscription, on an OPML or creator covering every
show in it, as hide_from_all does for All Subscriptions: the judge does
not put its items to Jev, and each Signal's list and counts leave them
out. shown_in() is the one SQL rule for both.

The settings dialog had grown one captioned setting at a time into a
single column, one part boxed and the rest not. It is in named parts now,
the name in a column beside the controls and above them on a phone, ruled
apart; All Subscriptions and Signals carry the sidebar's icons. The
address, the same for everyone, moves to the foot.

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

web/src/feeds.ts

@@ -35,9 +35,10 @@ const VIEWS: Record<string,{title: string, icon: string, url?: string, blurb?: s
     blurb:'Episodes you started and have not finished, across every feed you subscribe to. Pick one up where you left off.'},
   ':all':{title:'All Subscriptions',icon:ICON.all},
 };
-/// Whether a feed's items are in All Subscriptions: not when it, or the OPML or creator it came
-/// from, is hidden from it (#288). The server leaves out the same.
-const inAll=(f: Feed)=>!f.hide_from_all&&!(f.group&&S.feeds.some(g=>g.id===f.group&&g.hide_from_all));
+/// Whether a feed's items are in All Subscriptions, or in Signals: not when it, or the OPML or
+/// creator it came from, is hidden from them (#288, #289). The server leaves out the same.
+const shownIn=(f: Feed, key: 'hide_from_all'|'hide_from_signals')=>!f[key]&&!(f.group&&S.feeds.some(g=>g.id===f.group&&g[key]));
+const inAll=(f: Feed)=>shownIn(f,'hide_from_all');
 /// All Subscriptions' unread count.
 const unreadInAll=()=>S.feeds.reduce((n,f)=>n+(inAll(f)?f.unread||0:0),0);
 /// Feeds being checked right now, from the event stream, and since when: their rows, and the row