chore: add typed ESLint checks #18

Refs WealthLedger/main#18. Keep Biome; add no Prettier dependencies.

src/features/auth/model/auth-context.ts

@@ -0,0 +1,23 @@
+import { createContext, useContext } from "react";
+import type { paths } from "@/shared/api";
+
+type User =
+	paths["/api/v1/auth/me"]["get"]["responses"][200]["content"]["application/json"];
+type AuthContextValue = {
+	user: User | null;
+	accessToken: string | null;
+	ready: boolean;
+	login: (email: string, password: string) => Promise<void>;
+	register: (email: string, password: string) => Promise<void>;
+	logout: () => Promise<void>;
+	refresh: () => Promise<boolean>;
+};
+const AuthContext = createContext<AuthContextValue | null>(null);
+
+function useAuth() {
+	const context = useContext(AuthContext);
+	if (!context) throw new Error("AuthProvider is required");
+	return context;
+}
+
+export { AuthContext, type User, useAuth };