build(deps): add better auth

Author: MFarabi619

package.json

@@ -78,6 +78,7 @@
     "@tailwindcss/postcss": "4.0.6",
     "@tailwindcss/vite": "^4.0.6",
     "@xstate/react": "^5.0.2",
+    "better-auth": "^1.1.21",
     "clsx": "^2.1.1",
     "cmdk": "^1.0.4",
     "cross-env": "^7.0.3",