chore(deps): bump @pierre/trees from 1.0.0-beta.5 to 1.0.0-beta.6 in /ui

Bumps @pierre/trees from 1.0.0-beta.5 to 1.0.0-beta.6.

---
updated-dependencies:
- dependency-name: "@pierre/trees"
  dependency-version: 1.0.0-beta.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

ui/package.json

@@ -20,7 +20,7 @@
     "@monaco-editor/react": "^4.7.0",
     "@phosphor-icons/react": "^2.1.10",
     "@pierre/diffs": "^1.2.1",
-    "@pierre/trees": "1.0.0-beta.5",
+    "@pierre/trees": "1.0.0-beta.6",
     "@tailwindcss/vite": "^4.2.1",
     "@tanstack/react-devtools": "^0.10.0",
     "@tanstack/react-query": "^5.100.10",