Feat: Add active_callback support for Repeater control fields

[HadyShaltout]

Changelog:

• Enable conditional field visibility within repeater rows
• Add dynamic show/hide functionality based on field values
• Support complex conditional logic with AND/OR operators
• Include comprehensive examples in example.php
• Fix invalid SCSS import in control-repeater source
• Update CHANGELOG.md with version 5.1.1 details

See example.php lines 1077-1300 for usage examples

[shewa12]

👋 Hi there!

Thank you for taking the time to report issues and share feedback on Kirki — it genuinely helps us improve the plugin.

We’ve just released a beta version of Kirki (v5.2.0-beta.1) that includes:

⚡ Performance improvements

📦 Significant build size reduction (from 1.1 MB → 482 KB)

✅ Compatibility with WordPress 6.9

Before publishing the final stable release, we’d love feedback from volunteers like you.

🔹 Beta release:
https://github.com/themeum/kirki/releases/tag/v5.2.0-beta.1

🔹 Share feedback (completely voluntary):
https://docs.google.com/forms/d/e/1FAIpQLSf21Hni5UBExrkLZj8SUkz4DMy1kxxnZUXnej8-Mxxf5_BYOw/viewform

If you have time to test the beta and share your experience, it would mean a lot to us. Your feedback will directly help make the upcoming release more stable and bug-free.

Thanks again for supporting Kirki 💙
— The Kirki Team