fix: ignore generated .gen.ts files in biome formatting

Author: jremy42

biome.json

@@ -31,7 +31,8 @@
       "*.snap",
       "**/__snapshots__/",
       ".docusaurus",
-      ".vitest-reports"
+      ".vitest-reports",
+      "**/*.gen.ts"
     ]
   },
   "formatter": {