feat(core,app,android,ios,cli): look up new titles after every crawl, show presses and work on iOS

Metadata was only fetched after adding a share (mobile) or from the
Settings buttons (desktop), so a show or episode that turned up in an
existing share stayed bare. Every crawl is now followed by a match run
when enrichment is on; `plan` makes no requests for a library that is
already matched. A stored episode guide is fetched again when a file
newer than it has no named entry, and daily for two weeks while an
aired episode is still unnamed.

Removing a share now carries its watch state to any other share holding
the same file, `pstr remove` drops the share's catalog rows, and the app
forgets catalog rows of shares no longer configured — an older `pstr
remove` left them, and every episode showed twice.

iOS, for a slow iPad:
- swipe back on a settings page uses its own edge strip; on the whole
  page it also pressed the row under the finger and opened the metadata
  sheet
- "Change match" from the tile menu opens once the menu has dismissed,
  not after a guessed 350 ms that a slow device missed
- the activity banner tracks each running line by itself (also Android),
  so overlapping work no longer leaves it spinning forever
- buttons, tiles and rows draw their press; marking watched shows at
  once; remove/repair share, sign out and deletions show the banner;
  the player says "Opening…" while the stream opens
- posters are read into a reserved buffer instead of a byte at a time

ios/ProtonStream/Player/PlayerHost.swift

@@ -77,6 +77,10 @@ final class PlayerHost {
     private(set) var chapters = ChapterPlan(entries: [], creditsStart: nil)
     /// What stopped this episode, until the viewer dismisses it.
     var playbackError: String?
+    /// The stream is being opened: the share session, the revision and its
+    /// block list, all before mpv has a byte. On an old iPad that is seconds
+    /// of a black screen unless something says so.
+    private(set) var opening = false
     /// Read once per episode: a preference the viewer changes mid-episode
     /// applies to the next one.
     private(set) var autoSkip = false
@@ -177,6 +181,7 @@ final class PlayerHost {
         index = 0
         minimized = false
         playbackError = nil
+        opening = false
         chapters = ChapterPlan(entries: [], creditsStart: nil)
         OrientationLock.set(false)
         MPNowPlayingInfoCenter.default().nowPlayingInfo = nil
@@ -210,6 +215,7 @@ final class PlayerHost {
             return
         }
         try? AVAudioSession.sharedInstance().setActive(true)
+        opening = true
         loadTask = Task {
             do {
                 try await session.open()
@@ -244,6 +250,8 @@ final class PlayerHost {
                     hardwareDecoding: SettingsStore().hardwareDecoding
                 )
                 guard loaded else { throw PlaybackFailure("libmpv rejected the stream") }
+                // mpv's own buffering takes over the spinner from here.
+                opening = false
                 session.transferToPlayer()
                 // After the load, because mpv keeps none of the three across one.
                 player.setVolume(global.volume)
@@ -256,6 +264,7 @@ final class PlayerHost {
                     abandon(session)
                     return
                 }
+                opening = false
                 playbackError = errorMessage(error)
             }
         }