docs(changelog): add hub-client entry for 79edee2

Author: shikokuchuo

hub-client/changelog.md

@@ -15,6 +15,10 @@ be in reverse chronological order (latest first).
 
 -->
 
+### 2026-06-16
+
+- [`79edee27`](https://github.com/quarto-dev/q2/commits/79edee27): `.qmd` files now get dedicated tree-sitter–driven syntax highlighting in the editor — Quarto-aware Markdown structure, YAML frontmatter, and per-language code cells (R, Python, etc.), with code-cell colours matching the rendered preview.
+
 ### 2026-06-12
 
 - [`3a35de43`](https://github.com/quarto-dev/q2/commits/3a35de43): Project-creation scaffolds (`create_project`) now render their templates in pure Rust (quarto-doctemplate) instead of EJS via the JS bridge; titles containing quotes, backslashes, or `&` now produce correct YAML in `_quarto.yml` and `index.qmd`.