Add files via upload

frontend/src/store/useUIStore.js

@@ -1,13 +1,17 @@
 import { create } from 'zustand'
 
-const useUIStore = create((set) => ({
-  sidebarOpen:   true,
-  sidebarTab:    'projects',   // 'projects' | 'agenda'
-  showHeatmap:   false,
+export default create((set) => ({
+  sidebarOpen:  true,
+  toggleSidebar: () => set(s => ({ sidebarOpen: !s.sidebarOpen })),
 
-  toggleSidebar:  ()    => set(s => ({ sidebarOpen: !s.sidebarOpen })),
-  setSidebarTab:  (tab) => set({ sidebarTab: tab }),
-  toggleHeatmap:  ()    => set(s => ({ showHeatmap: !s.showHeatmap })),
+  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 }),
 }))
-
-export default useUIStore