feat: archive sessions from the mobile session row

Add a two-step archive affordance to each mobile session row, mirroring the
project remove confirmation: tapping the archive icon arms an inline confirm
(with cancel), and confirming archives the session. Only one row can be in
the confirming state at a time.

Also relabel the project remove confirmation from "Delete" to "Close"
across all locales, since removing a project closes it from the app rather
than deleting anything.

packages/ui/src/lib/i18n/messages/uk.ts

@@ -64,9 +64,11 @@ export const dict: Record<I18nKey, string> = {
   "mobile.sessions.moveDownAria": "Перемістити {label} вниз",
   "mobile.sessions.removeProjectAria": "Видалити {label}",
   "mobile.sessions.cancelRemoveProjectAria": "Скасувати видалення {label}",
-  "mobile.sessions.confirmRemoveProject": "Видалити",
+  "mobile.sessions.confirmRemoveProject": "Закрити",
   "mobile.sessions.confirmRemoveProjectAria": "Підтвердити видалення {label}",
   "mobile.sessions.toast.projectRemoved": "Видалено {label}",
+  "mobile.sessions.archiveSessionAria": "Архівувати {title}",
+  "mobile.sessions.cancelArchiveAria": "Скасувати архівування {title}",
   "mobile.sessions.editProjectAria": "Редагувати {label}",
   "mobile.projectEdit.worktreesTitle": "Ворктрі",
   "mobile.projectEdit.worktreesEmpty": "У цьому проєкті ще немає ворктрі.",