Add files via upload

frontend/src/store/useToastStore.js

@@ -0,0 +1,15 @@
+import { create } from 'zustand'
+
+let _id = 0
+
+const useToastStore = create((set) => ({
+  toasts: [],
+  addToast: ({ message, undoFn, duration = 30 }) => {
+    const id = ++_id
+    set(s => ({ toasts: [...s.toasts, { id, message, undoFn, duration }] }))
+    return id
+  },
+  removeToast: (id) => set(s => ({ toasts: s.toasts.filter(t => t.id !== id) })),
+}))
+
+export default useToastStore