Replace hardcoded expiration date '2025-12-31T23:59' with dynamically
generated future date. The tests were failing with "Expiration date
must be in the future" validation error since it's now 2026.
Added getFutureExpirationDate() helper that returns a date 1 year
from now in the required datetime-local format.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>