main
billing: Move zilencer/lib/stripe to corporate.
activity: Add bot owner information for bot users in activity charts.
corporate: Add BillingSessionCommand for billing management commands.
corporate: Use Literal types for upgrade parameters.
request: Use Django 5.2 HttpRequest.get_preferred_type.
models: Refactor corporate/models.py into models package.
get_identity_dict_from_session: Use overload to avoid unnecessary cast.
corporate: Show downgrade notice for voided free-trial invoice.
corporate: Handle Stripe invoice.voided webhook events.
corporate: Add BillingUserCounts dataclass for billable user counts.