Function sanitize_bundle_for_config

pub fn sanitize_bundle_for_config(
    bundle: &BundleRaw,
    game_config: &GameConfig,
) -> Option<BundleRaw>

Drops everything a stored bundle references that no longer exists in the live config, and returns None when nothing claimable is left.

Config bundles are looked up by id and re-read from GameConfig on every load, so they cannot go stale. Operator-composed gifts have no config entry — they are snapshots persisted with the mail and with the character_bundles row — so an item template, ability or currency removed from the config after the gift was sent would otherwise be granted as a dangling id. Item and ability steps already skip unknown ids when they are turned into elements; currencies do not, and an emptied step would still produce an empty reward popup. Both are handled here.