feat: 로그인 화면 및 공통 속성 생성

src/store/auth.tsx

@@ -0,0 +1,31 @@
+import React, { createContext, useContext, useMemo, useState } from "react";
+
+export type AuthContextValue = {
+  isAuthed: boolean;
+  login: () => void;
+  logout: () => void;
+};
+
+const AuthContext = createContext<AuthContextValue | null>(null);
+
+export function AuthProvider({ children }: { children: React.ReactNode }) {
+  const [isAuthed, setIsAuthed] = useState<boolean>(false);
+  console.log("isAuthed: " + isAuthed);
+
+  const value = useMemo<AuthContextValue>(
+    () => ({
+      isAuthed,
+      login: () => setIsAuthed(true),
+      logout: () => setIsAuthed(false),
+    }),
+    [isAuthed]
+  );
+
+  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
+}
+
+export function useAuth(): AuthContextValue {
+  const ctx = useContext(AuthContext);
+  if (!ctx) throw new Error("useAuth must be used within AuthProvider");
+  return ctx;
+}