Mouse/touch event handling improvement

- prefer passive handlers
- fix event moving on touch
- faster selection updates

src/stores/CalendarStore.js

@@ -14,9 +14,6 @@ export const useCalendarStore = defineStore('calendar', {
     today: toLocalString(new Date(), DEFAULT_TZ),
     now: new Date().toISOString(),
     events: new Map(),
-    // Lightweight mutation counter so views can rebuild in a throttled / idle way
-    // without tracking deep reactivity on every event object.
-    eventsMutation: 0,
     // Incremented internally by history plugin to force reactive updates for canUndo/canRedo
     historyTick: 0,
     historyCanUndo: false,
@@ -117,10 +114,7 @@ export const useCalendarStore = defineStore('calendar', {
       return 'e-' + Math.random().toString(36).slice(2, 10) + '-' + Date.now().toString(36)
     },
 
-    notifyEventsChanged() {
-      // Bump simple counter (wrapping to avoid overflow in extreme long sessions)
-      this.eventsMutation = (this.eventsMutation + 1) % 1_000_000_000
-    },
+    notifyEventsChanged() {},
     touchEvents() {
       this.notifyEventsChanged()
     },