sso: polyfill buffer for browser

src/lib/auth-client.ts

@@ -1,3 +1,4 @@
+import "@/lib/polyfills/buffer";
 import { createAuthClient } from "better-auth/react";
 import { oidcClient } from "better-auth/client/plugins";
 import { ssoClient } from "@better-auth/sso/client";
@@ -60,4 +61,4 @@ export type Session = BetterAuthSession & {
 };
 export type AuthUser = BetterAuthUser & {
   username?: string | null;
-};
+};

src/lib/polyfills/buffer.ts

@@ -0,0 +1,5 @@
+import { Buffer } from "buffer";
+
+if (typeof globalThis !== "undefined" && (globalThis as any).Buffer === undefined) {
+  (globalThis as any).Buffer = Buffer;
+}