Update changelog for agent improvements

[handotdev]

Added December 11, 2025 changelog entry documenting agent suggestions UI enhancements, analytics tracking, and repository monitoring improvements. This update captures the changes from PR #4998 including empty state illustrations, improved "Add to chat" flow, and GitHub repository monitoring UI.

Files changed:

• changelog.mdx

cc @yangleyland

---

Note

Adds a December 11, 2025 changelog entry detailing agent suggestion UX, analytics, repo monitoring UI, and minor UI tweaks.

• Changelog
  • Added "December 11, 2025" update in changelog.mdx.
    • Agent improvements: empty-state illustrations, fixed "Add to chat" session start, PostHog tracking for apply/dismiss, GitHub repo monitoring UI (search, enable/disable all, per-repo toggles) with tracking, styling refinements.
    • UI improvements: simplified GitHub PR label styling, adjusted agent panel header/buttons, changed context badge remove control for better form behavior.

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