Frontend: CSS modules, Zustand + URL sync

frontend/src/store/navStore.ts

@@ -0,0 +1,17 @@
+import { create } from "zustand";
+
+interface NavState {
+  celexId: string | null;
+  articleId: number | null;
+  setCelexId: (celexId: string) => void;
+  setArticleId: (articleId: number | null) => void;
+}
+
+const useNavState = create<NavState>((set) => ({
+  celexId: null,
+  articleId: null,
+  setCelexId: (celexId) => set({ celexId }),
+  setArticleId: (articleId) => set({ articleId }),
+}));
+
+export default useNavState;