chore: add frontend/src/stores/uiStore.ts

frontend/src/stores/uiStore.ts

@@ -0,0 +1,24 @@
+// UI State Store
+import { create } from 'zustand';
+import { persist } from 'zustand/middleware';
+
+interface UiState {
+  sidebarCollapsed: boolean;
+  toggleSidebar: () => void;
+  setSidebarCollapsed: (collapsed: boolean) => void;
+}
+
+export const useUiStore = create<UiState>()(
+  persist(
+    (set) => ({
+      sidebarCollapsed: false,
+      toggleSidebar: () => 
+        set((state) => ({ sidebarCollapsed: !state.sidebarCollapsed })),
+      setSidebarCollapsed: (collapsed) => 
+        set(() => ({ sidebarCollapsed: collapsed })),
+    }),
+    {
+      name: 'ui-storage',
+    }
+  )
+);