feat(admin/problemset): add Zustand store for new problem state

src/app/(app)/dashboard/@admin/problemset/new/store.ts

@@ -0,0 +1,19 @@
+import { create } from "zustand";
+import { createJSONStorage, persist } from "zustand/middleware";
+import { ProblemSchema } from "@/components/features/dashboard/admin/problemset/new/schema";
+
+type NewProblemState = Partial<ProblemSchema> & {
+  setData: (data: Partial<ProblemSchema>) => void;
+};
+
+export const useNewProblemStore = create<NewProblemState>()(
+  persist(
+    (set) => ({
+      setData: (data) => set(data),
+    }),
+    {
+      name: "new-problem-storage",
+      storage: createJSONStorage(() => localStorage),
+    }
+  )
+);