Persist in localStorage

src/stores/CalendarStore.js

@@ -7,7 +7,7 @@ const MAX_YEAR = 2100
 export const useCalendarStore = defineStore('calendar', {
   state: () => ({
     today: toLocalString(new Date()),
-    now: new Date(),
+    now: new Date().toISOString(), // store as ISO string
     events: new Map(), // Map of date strings to arrays of events
     weekend: getLocaleWeekendDays(),
     config: {
@@ -26,8 +26,9 @@ export const useCalendarStore = defineStore('calendar', {
 
   actions: {
     updateCurrentDate() {
-      this.now = new Date()
-      const today = toLocalString(this.now)
+      const d = new Date()
+      this.now = d.toISOString()
+      const today = toLocalString(d)
       if (this.today !== today) {
         this.today = today
       }
@@ -468,4 +469,19 @@ export const useCalendarStore = defineStore('calendar', {
 
     // NOTE: legacy dynamic getEventById for synthetic occurrences removed.
   },
+  persist: {
+    key: 'calendar-store',
+    storage: localStorage,
+    paths: ['today', 'events', 'config'],
+    serializer: {
+      serialize(value) {
+        return JSON.stringify(value, (_k, v) =>
+          v instanceof Map ? { __map: true, data: [...v] } : v,
+        )
+      },
+      deserialize(value) {
+        return JSON.parse(value, (_k, v) => (v && v.__map ? new Map(v.data) : v))
+      },
+    },
+  },
 })