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/CHANGELOG.md

@@ -11,9 +11,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- A feed's settings are in parts, each named beside its controls: Downloads, Playback, Where it shows, Directory and Address, with All Subscriptions and Signals drawn as the sidebar draws them (#290).
+
 ### Added
 
 - A feed's, an OPML subscription's or a Patreon creator's settings have In All Subscriptions: off keeps its items out of All Subscriptions and its unread count, still there on its own page, in Signals and in Currently Listening (#288).
+- A feed's settings have a Signals switch beside All Subscriptions, to keep its items out of every Signal (#289).
 - An item sent as both HTML and Markdown, as Scripting News's are, has a choice beside its buttons to show it as the publisher's HTML or as the Markdown, kept from one item to the next (#285).
 - A show inside an OPML subscription has a Keep button, a plus, on its page, so it stays on your list as a show of its own if the OPML drops it or you unsubscribe from the OPML (#280).
 - Admin, Server: a setting to give everyone Signals on the server's TypeSafe key (#271).