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/pl.ts

@@ -65,9 +65,11 @@ export const dict: Record<I18nKey, string> = {
   'mobile.sessions.moveDownAria': 'Przenieś {label} w dół',
   'mobile.sessions.removeProjectAria': 'Usuń {label}',
   'mobile.sessions.cancelRemoveProjectAria': 'Anuluj usuwanie {label}',
-  'mobile.sessions.confirmRemoveProject': 'Usuń',
+  'mobile.sessions.confirmRemoveProject': 'Zamknij',
   'mobile.sessions.confirmRemoveProjectAria': 'Potwierdź usunięcie {label}',
   'mobile.sessions.toast.projectRemoved': 'Usunięto {label}',
+  'mobile.sessions.archiveSessionAria': 'Zarchiwizuj {title}',
+  'mobile.sessions.cancelArchiveAria': 'Anuluj archiwizację {title}',
   'mobile.sessions.editProjectAria': 'Edytuj {label}',
   'mobile.projectEdit.worktreesTitle': 'Worktree',
   'mobile.projectEdit.worktreesEmpty': 'Ten projekt nie ma jeszcze worktree.',