Mouse/touch event handling improvement

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

src/components/CalendarView.vue

@@ -248,7 +248,7 @@ function onGlobalTouchMove(e) {
   if (!isDragging.value) return
   const t = e.touches && e.touches[0]
   if (!t) return
-  e.preventDefault()
+  if (e.cancelable) e.preventDefault()
   const dateStr = getDateUnderPoint(t.clientX, t.clientY)
   if (dateStr) updateDrag(dateStr)
 }
@@ -435,10 +435,11 @@ function buildSearchResults() {
 
 watch(searchQuery, buildSearchResults)
 watch(
-  () => calendarStore.eventsMutation,
+  () => calendarStore.events,
   () => {
     if (searchOpen.value && searchQuery.value.trim()) buildSearchResults()
   },
+  { deep: true },
 )
 
 function openSearch(prefill = '') {
@@ -569,19 +570,22 @@ watch(
   },
 )
 
-// Event changes
+// Event changes (optimized): react to mutation counter & targeted range payload
 watch(
   () => calendarStore.events,
-  () => {
-    refreshEvents('events')
-  },
+  () => refreshEvents('events'),
   { deep: true },
 )
 
 // Reflect selection & events by rebuilding day objects in-place
 watch(
   () => [selection.value.startDate, selection.value.dayCount],
-  () => refreshEvents('selection'),
+  ([start, count]) => {
+    const hasSel = !!start && !!count && count > 0
+    const end = hasSel ? addDaysStr(start, count, DEFAULT_TZ) : null
+    for (const w of visibleWeeks.value)
+      for (const d of w.days) d.isSelected = hasSel && d.date >= start && d.date < end
+  },
 )
 
 // Rebuild if viewport height changes (e.g., resize)

src/components/CalendarWeek.vue

@@ -57,7 +57,7 @@ function shouldRotateMonth(label) {
         @mousedown="handleDayMouseDown(day.date)"
         @mouseenter="handleDayMouseEnter(day.date)"
         @mouseup="handleDayMouseUp(day.date)"
-        @touchstart="handleDayTouchStart(day.date)"
+        @touchstart.passive="handleDayTouchStart(day.date)"
       />
       <EventOverlay :week="props.week" @event-click="handleEventClick" />
     </div>

src/components/EventOverlay.vue

@@ -278,9 +278,7 @@ function startLocalDrag(init, evt) {
     }
   }
 
-  if (!(evt.pointerType === 'touch')) {
-    evt.preventDefault()
-  }
+  if (evt.cancelable) evt.preventDefault()
 
   window.addEventListener('pointermove', onDragPointerMove, { passive: false })
   window.addEventListener('pointerup', onDragPointerUp, { passive: false })
@@ -486,6 +484,8 @@ function applyRangeDuringDrag(st, startDate, endDate) {
   user-select: none;
   z-index: 1;
   text-align: center;
+  /* Ensure touch pointer events aren't turned into a scroll gesture; needed for reliable drag on mobile */
+  touch-action: none;
 }
 
 /* Inner title wrapper ensures proper ellipsis within flex/grid constraints */
@@ -510,6 +510,7 @@ function applyRangeDuringDrag(st, startDate, endDate) {
   background: transparent;
   z-index: 2;
   cursor: ew-resize;
+  touch-action: none; /* Allow touch resizing without scroll */
 }
 
 .event-span .resize-handle.left {

src/plugins/calendarHistory.js

@@ -18,7 +18,6 @@ function restoreCalendarState(store, snap) {
   store.weekend = Array.isArray(snap.weekend) ? [...snap.weekend] : snap.weekend
   store.config = JSON.parse(JSON.stringify(snap.config))
   store.events = new Map([...snap.events].map(([k, v]) => [k, { ...v }]))
-  store.eventsMutation = (store.eventsMutation + 1) % 1_000_000_000
 }
 
 export function calendarHistory({ store }) {
@@ -36,8 +35,7 @@ export function calendarHistory({ store }) {
 
   function serializeForComparison() {
     const evCount = store.events instanceof Map ? store.events.size : 0
-    const em = store.eventsMutation || 0
-    return `${em}|${evCount}|${store.today}|${JSON.stringify(store.config)}`
+    return `${evCount}|${store.today}|${JSON.stringify(store.config)}`
   }
 
   function pushSnapshot() {

src/plugins/scrollManager.js

@@ -124,7 +124,6 @@ function createMomentumDrag({
       return
     }
     applyDragPosition(e.touches[0].clientY, reasonDragTouch)
-    e.preventDefault()
   }
   function handlePointerDown(e) {
     if (e.button !== undefined && e.button !== 0) return
@@ -158,7 +157,7 @@ function createMomentumDrag({
     window.addEventListener('touchmove', onTouchMove, { passive: false })
     window.addEventListener('touchend', endDrag, { passive: false })
     window.addEventListener('touchcancel', endDrag, { passive: false })
-    e.preventDefault()
+    if (e.cancelable) e.preventDefault()
   }
   function onPointerLockChange() {
     const lockedEl = document.pointerLockElement

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()
     },