Settings takes a persona's whole archive away and brings one back

Data import/export gains the persona's archive (PrivaPub's /clientapi/persona/{id}/archive): made on PrivaPub in
Mastodon's account-archive layout and downloaded through a link; and an archive, its own or Mastodon's, uploaded in
pieces straight from the picked file (js/transfer.js) and imported into the persona, the parts chosen (likes, located
and scheduled posts only when ticked), with progress, a report of what came and what was left out, and Stop. Imported
posts are delivered to no one.

e2e: a town persona's archive downloaded and imported into another, whose profile then shows the posts; the copies are
taken away after.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

ClientJsonContext.cs

@@ -64,6 +64,10 @@ namespace decePubClient;
 [JsonSerializable(typeof(RestoreBackupForm))]
 [JsonSerializable(typeof(ViewBackupTicket))]
 [JsonSerializable(typeof(ViewBackupUpload))]
+[JsonSerializable(typeof(ViewPersonaArchive))]
+[JsonSerializable(typeof(ImportPersonaArchiveForm))]
+[JsonSerializable(typeof(ViewArchiveTicket))]
+[JsonSerializable(typeof(ViewArchiveUpload))]
 public partial class ClientJsonContext : JsonSerializerContext
 {
 }