Document failed Chakra UI v3 migration attempt

This commit documents the second failed attempt to migrate from Chakra UI
v2.10.9 to v3.30.0 on December 15, 2024.

Migration failed due to fundamental SSR incompatibility between:
- Chakra UI v3's forwardRef component architecture
- Next.js 16 (Pages Router with getStaticProps)
- React 19 SSR implementation

All migration work was rolled back to commit 69baab8. The site is now
running successfully on Chakra UI v2.10.9.

Created comprehensive documentation in llm-docs/chakra3-migration-attempt-2.mdx
detailing:
- What was attempted (8 implementation phases completed)
- Critical errors encountered (SSR incompatibility blocker)
- Root cause analysis (based on official Chakra creator's article)
- Rollback process (successful restoration to v2)
- Recommendation to stay on v2 until Q1-Q2 2025

Recommendation: Postpone migration until Chakra v3 RSC support stabilizes
and Next.js 16 reaches stable release.

References:
- https://www.adebayosegun.com/blog/chakra-panda-ark-whats-the-plan
- chakra-ui/chakra-ui#8216

Author: Jesse Chen