feat: auth client middleware

apps/client/app/context.ts

@@ -0,0 +1,12 @@
+import { createContext } from "react-router";
+import type { User } from "./lib/types";
+
+type AppContext = {
+	user: User | null;
+	hasUsers: boolean;
+};
+
+export const appContext = createContext<AppContext>({
+	user: null,
+	hasUsers: false,
+});