Report native calls that end without us to CallKit

The call package now says why a call ended. Only our own hang-up is an
end call action; a call the other side declined or left, that nobody
answered, or that failed is reported to CallKit with that reason, so the
call log no longer shows it as one we ended, and no end action comes back
to hang up a call that is already over.

Also adopts the package's other host changes: the voice call icon beside
"Calling…", and the call's large avatar rendered at the 140 pt it is
drawn at.

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

ElementX/Sources/Other/Avatars.swift

@@ -90,6 +90,8 @@ enum UserAvatarSizeOnScreen {
     case map
     case classicAppAccount
     case search
+    /// The native call's large avatar: a one-to-one call, the spotlight and the ringing screen.
+    case call
     
     var value: CGFloat {
         switch self {
@@ -122,6 +124,8 @@ enum UserAvatarSizeOnScreen {
             75
         case .memberDetails, .editUserDetails, .classicAppAccount:
             96
+        case .call:
+            140
         }
     }
 }