Function call_scope_extra_gas 

fn call_scope_extra_gas(auth: &KeyAuthorization) -> u64

Charges the unpriced scope-helper bookkeeping for T4 key authorizations. The dynamic SSTORE rows are already counted by call_scope_storage_slots(). What remains is the helper work around them: clearing the empty scope tree for fresh keys, target/set maintenance, selector/set maintenance, and recipient-set writes. We use rounded constants here because the goal is to stop the undercharge without mirroring every storage helper exactly.

The chosen values intentionally round upward:

• base 5k covers the always-run empty-tree clear and restricted/unrestricted mode bookkeeping,
• 7k per target and 7k per selector cover the set-maintenance work around each scope layer,
• 5k per recipient covers the extra recipient-set persistence.

The objective is to stay roughly aligned with authorization pricing while avoiding materially low charges on larger scope trees, even if that means slight overcharging in simpler cases.

TODO: Refactor intrinsic gas accounting so this and the other intrinsic surcharges come from one shared model instead of per-feature heuristics.