Add files via upload

frontend/src/store/useToastStore.js

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+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

frontend/src/store/useUIStore.js

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+import { create } from 'zustand'
+
+const useUIStore = create((set) => ({
+  sidebarOpen:   true,
+  sidebarTab:    'projects',   // 'projects' | 'agenda'
+  showHeatmap:   false,
+
+  toggleSidebar:  ()    => set(s => ({ sidebarOpen: !s.sidebarOpen })),
+  setSidebarTab:  (tab) => set({ sidebarTab: tab }),
+  toggleHeatmap:  ()    => set(s => ({ showHeatmap: !s.showHeatmap })),
+}))
+
+export default useUIStore