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

Pages/Settings.razor

@@ -133,7 +133,10 @@
 				<div class="block w-full p-3 md:p-4">
 					@if (CascadingState.IsSignedIn)
 					{
-						<DataTransfer />
+						<div class="flex flex-col gap-6">
+							<PersonaArchivePanel />
+							<DataTransfer />
+						</div>
 					}
 					else
 					{