CONV-270: Add credit pack transaction metadata

[menvil]

Summary

• Adds metadata verification test: pack_key, pack_credits, stripe_event_id, stripe_checkout_session_id, stripe_payment_intent_id, stripe_price_id all present in credit_transactions.metadata_json
• Metadata was already written in CONV-267/269; this task adds the explicit test

Test plan

• tests/Feature/Billing/CreditPackWebhookHandlerTest.php — metadata shape verified
• composer test passes (482 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds tests to verify credit pack purchase transactions persist Stripe metadata and that credits are granted only once per checkout session. Fulfills CONV-270 by asserting credit_transactions.metadata_json includes pack_key, pack_credits, stripe_event_id, stripe_checkout_session_id, stripe_payment_intent_id, and stripe_price_id.

^{Written for commit 4fa1037. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-270-add-credit-pack-transaction-metadata

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