Initial commit

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/stores/toastStore.ts

@@ -0,0 +1,35 @@
+import { create } from 'zustand';
+
+export interface Toast {
+  id: string;
+  type: 'success' | 'error' | 'info';
+  message: string;
+}
+
+interface ToastState {
+  toasts: Toast[];
+  addToast: (type: Toast['type'], message: string) => void;
+  removeToast: (id: string) => void;
+}
+
+export const useToastStore = create<ToastState>((set) => ({
+  toasts: [],
+
+  addToast: (type, message) => {
+    const id = crypto.randomUUID();
+    set((state) => ({
+      toasts: [...state.toasts, { id, type, message }],
+    }));
+    setTimeout(() => {
+      set((state) => ({
+        toasts: state.toasts.filter((t) => t.id !== id),
+      }));
+    }, 3000);
+  },
+
+  removeToast: (id) => {
+    set((state) => ({
+      toasts: state.toasts.filter((t) => t.id !== id),
+    }));
+  },
+}));