fabdash/frontend/src/store/useUIStore.js

import { create } from 'zustand'

export default create((set) => ({
  sidebarOpen:  true,
  toggleSidebar: () => set(s => ({ sidebarOpen: !s.sidebarOpen })),

  sidebarTab:    'projects',
  setSidebarTab: (tab) => set({ sidebarTab: tab }),

  showHeatmap:  false,
  toggleHeatmap: () => set(s => ({ showHeatmap: !s.showHeatmap })),

  // Set by HeatmapDayPanel "Jump to Calendar" — MainCalendar watches and navigates
  heatmapJumpDate: null,
  jumpToCalendarDate: (date) => set({ heatmapJumpDate: date, showHeatmap: false }),
  clearJumpDate:      ()     => set({ heatmapJumpDate: null }),
}))