Briefing receipts now fire only after payment

Fixed a bug where Briefing purchase notifications could fire on session creation rather than payment confirmation. Receipts now fire when Stripe confirms.

A small but important fix: Briefing purchase notifications were sometimes firing the moment a Briefing session was created — before payment had confirmed through Stripe. If you saw a notification but no charge, that was why.

We fixed the trigger to fire only after Stripe confirms. Five backdated notifications were corrected. If you experienced this, your account is now showing the right state.