CONV-246: Add billing success and cancel pages

[menvil]

Summary

• Auth-protected /billing/success and /billing/cancel pages
• Views show appropriate messages without claiming plan is active (webhook confirms that)
• Tests cover page rendering and auth protection

Test plan

• Success page renders with "Billing successful" text
• Cancel page renders with "Billing cancelled" text
• Both pages require authentication
• composer test passes (445 tests)
• composer lint passes
• npm run build passes

🤖 Generated with Claude Code

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Summary by cubic

Adds feature tests for the auth-protected billing result pages (/billing/success, /billing/cancel), verifying they render the expected messages and require login. Satisfies CONV-246 by locking down access and validating copy while activation remains webhook-driven.

^{Written for commit b060ff3. 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-246-add-billing-success-and-cancel-pages

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