feat(trips): trip settings with a linked journal tab

The Share button becomes the trip's Settings, a round button beside the back
pill. The dialog is rebuilt around three areas (People, Sharing, Journal) with
a side navigation, a fixed height and 960 px width on wide screens.

Journal links one of your journals from the Journey addon to the trip. Every
trip member is ticked as a reader by default, each can be raised to editor or
left out, and the people a save would let in for the first time are named
before it saves. The link can be changed or removed. With a link the trip gets
a Journal tab on desktop and phone that shows the Journey addon's own view,
live through its sync and trip:journal:changed. Nothing shows with the addon
off.

members.shareTrip and nav.share are gone with the button that used them.

client/src/api/wsEventPolicy.ts

@@ -93,6 +93,10 @@ export const HANDLED_OUTSIDE_TRIP_STORE = [
   // the bag ping: what a run changed is per-binding server state, and the
   // files it moved arrive as file:* events.
   'docsync:changed',
+  // Linked journal: components/Trips/useTripJournalLink asks again which journal
+  // the trip shows and who it is open to. Content-free, because that answer is
+  // per person (a member left off the link must not learn its title).
+  'trip:journal:changed',
   // Booking import — BackgroundTasks/BackgroundTasksWidget ('import:' prefix listener)
   'import:progress',
   'import:done',