* feat(mobile): rename, delete, and create sidebar session groups on iOS and Android
Group section headers on the iOS Command Center sessions screen and the
Android sessions screen gain Rename/New/Delete group actions. Bulk ops
enumerate every member (active + archived, explicit high list limit since
the gateway caps an absent limit at 100 rows) and patch category per
session; delete keeps sessions and moves them to Ungrouped. Known custom
groups persist client-side (iOS UserDefaults, Android SharedPreferences)
so empty groups stay visible as move targets.
* chore(i18n): refresh native string inventory after rebase onto main
