fix: bundle @convex-dev/better-auth in SSR to prevent React instance duplication

apps/web/vite.config.ts

@@ -7,6 +7,9 @@ import { defineConfig } from "vite-plus";
 export default defineConfig({
   envDir: path.resolve(import.meta.dirname, "../.."),
   plugins: [tailwindcss(), reactRouter()],
+  ssr: {
+    noExternal: ["@convex-dev/better-auth", "@code/auth", "@code/backend"],
+  },
   resolve: {
     dedupe: ["convex", "react", "react-dom"],
     tsconfigPaths: true,