* Hide payment contribution options from demo and manually created users
Demo data users and manually created users don't have stripe_customer_id
set on their family, so they should not see payment/contribution options.
Changes:
- Add can_manage_subscription? method to Family::Subscribeable that checks
for presence of stripe_customer_id
- Guard Settings::PaymentsController to return 403 for users without
stripe_customer_id
- Guard SubscriptionsController#show action (Stripe portal redirect) for
users without stripe_customer_id
- Update settings navigation to hide the payment link when
stripe_customer_id is not present
- Add tests for the new behavior
* Fix broken test
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Co-authored-by: Claude <noreply@anthropic.com>
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