feat(core,app,android,ios): My List, synced, and New badges with new-episode rows

My List is a list of titles to watch later, kept in my-list.json by
title key (pstr-core::mylist) and synced as one list/<key> register per
title, so an add or a removal on one device reaches every other. A list
file that will not parse is never written over: changing the list is
refused instead. It is a filter, a row on the library, a button on the
banner and the title page, and an entry in each tile's menu.

pstr-core::news reads node_first_seen against each share's first crawl,
so a newly added share does not badge its whole library. A title that
arrived in the last two weeks and was never played is New; a series
being watched counts the unwatched episodes that arrived after it was
last played ("3 new"). They fill the tile badge and the "New episodes"
and "Recently added" rows. shelves::home puts every row in one order
for all three apps, and a shelf tile of an airing show shows a
countdown ("Ep 8 · in 2 d").

The bridge gains TitleRecord.on_list and .badge, set_on_list, the
MyList filter, airing_countdown and SyncRecord.list_changed.

ios/ProtonStream/App/AppModel.swift

@@ -480,7 +480,7 @@ final class AppModel {
         if report.settingsChanged {
             await AppearanceState.shared.reload()
         }
-        if report.applied > 0 || report.titles > 0 || report.settingsChanged || !report.sharesRemoved.isEmpty {
+        if report.applied > 0 || report.titles > 0 || report.settingsChanged || report.listChanged || !report.sharesRemoved.isEmpty {
             await reloadNow()
         }
         // A crawl takes longer than the grace iOS gives a backgrounded app.
@@ -534,6 +534,20 @@ final class AppModel {
         }
     }
 
+    // MARK: - My List
+
+    /// Put a title on My List, or take it off.
+    func setOnList(_ title: TitleRecord, _ on: Bool) {
+        Task {
+            do {
+                try await run { try $0.setOnList(key: title.key, on: on) }
+            } catch {
+                reportError(error)
+            }
+            reload()
+        }
+    }
+
     // MARK: - Watch state
 
     /// Every episode of a title watched or unwatched, with an Undo: a whole