fix(ui): replace custom regex with marked Lexer for inline description parsing

Uses marked's Lexer.lexInline() instead of a hand-rolled regex to parse
inline links in the Header description. marked ships CommonJS, has zero
dependencies, and is already used in the monorepo. This gives us a proper
token model that handles edge cases the regex could not.

Signed-off-by: Charles de Dreuille <charles.dedreuille@gmail.com>

packages/ui/package.json

@@ -50,6 +50,7 @@
     "@remixicon/react": "^4.6.0",
     "@tanstack/react-table": "^8.21.3",
     "clsx": "^2.1.1",
+    "marked": "^15.0.12",
     "react-aria": "~3.48.0",
     "react-aria-components": "~1.17.0",
     "react-stately": "~3.46.0",