chore(auth): remove redundant role override in customSession

The admin plugin already includes role on the user object.
No need to manually spread it in customSession.

Author: waleedlatif1

apps/sim/lib/auth/auth.ts

@@ -649,10 +649,7 @@ export const auth = betterAuth({
       expiresIn: 24 * 60 * 60, // 24 hours - Socket.IO handles connection persistence with heartbeats
     }),
     customSession(async ({ user, session }) => ({
-      user: {
-        ...user,
-        role: (user as unknown as { role?: string }).role ?? 'user',
-      },
+      user,
       session,
     })),
     emailOTP({