chore(deps): update dependency tsdown to ^0.9.9 (#654)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -135,7 +135,7 @@
     "simple-git-hooks": "^2.13.0",
     "svelte": "^5.28.2",
     "svelte-eslint-parser": "^1.1.3",
-    "tsdown": "^0.9.6",
+    "tsdown": "^0.9.9",
     "typescript": "^5.8.3"
   },
   "pnpm": {