Fix 2089 - emoji rendering in iTerm2

[dgageot]

No description provided.

[docker-agent]

Review Summary

Assessment: 🟢 APPROVE

Summary

This PR adds a replace directive to use a personal fork of github.com/charmbracelet/ultraviolet to fix issue #2089 related to emoji rendering in iTerm2.

Analysis:

• The replace directive syntax is correct and follows Go module conventions
• The go.sum entries are properly updated (old upstream entries removed, new fork entries added)
• Using a personal fork via replace is a standard Go development pattern for testing fixes before they're merged upstream
• The future timestamp (2026) in the pseudo-version, while unusual, is valid - it reflects the Git commit timestamp and doesn't indicate a bug or security issue
• The PR author (dgageot) is the same as the fork owner, making this a transparent, reviewable change

Findings: No bugs detected in the changed code.

The dependency management changes are implemented correctly according to Go module best practices.

---

Automated review by docker-agent PR reviewer