chore(deps): update dependency tsdown to v0.12.6 (#688)

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

Author: renovate[bot]

package.json

@@ -138,7 +138,7 @@
     "simple-git-hooks": "^2.13.0",
     "svelte": "^5.33.4",
     "svelte-eslint-parser": "^1.2.0",
-    "tsdown": "0.12.5",
+    "tsdown": "0.12.6",
     "typescript": "^5.8.3"
   },
   "pnpm": {