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Selecting US in the BaseUI region chooser now installs LongTurbo instead of LongFast, but only for out-of-box setup: the outgoing region must be UNSET, so a later switch to US leaves whatever preset the node is running alone. Scoped to the menu on purpose. The US entry in regions[] keeps LongFast as its default preset, so preset repair, admin/phone writes and every other route onto US are unchanged. A build pinning USERPREFS_LORACONFIG_MODEM_PRESET, a preset already moved off the install default, or use_preset=false all outrank it. The decision is lifted into menuHandler::presetForRegionSelection() so it is reachable without a Screen, following toggleNodeMuted().