src/components/EventOverlay.vue

@@ -299,6 +299,19 @@ function onDragPointerMove(e) {
       ns,
       ne,
     )
+  } else if (st.isVirtual && (st.mode === 'resize-left' || st.mode === 'resize-right')) {
+    // For virtual occurrence resize: convert to real once, then adjust range
+    if (!st.realizedId) {
+      const newId = store.splitMoveVirtualOccurrence(st.id, st.startDate, st.startDate, st.endDate)
+      if (newId) {
+        st.realizedId = newId
+        st.id = newId
+        st.isVirtual = false
+      } else return
+    }
+    // Apply range change; rotate if left edge moved and weekday changed
+    const rotate = st.mode === 'resize-left'
+    store.setEventRange(st.id, ns, ne, { mode: st.mode, rotatePattern: rotate })
   }
 }
 

src/stores/CalendarStore.js

@@ -286,8 +286,8 @@ export const useCalendarStore = defineStore('calendar', {
         DEFAULT_TZ,
       )
       if (
-        mode === 'move' &&
         rotatePattern &&
+        (mode === 'move' || mode === 'resize-left') &&
         snapshot.isRepeating &&
         snapshot.repeat === 'weeks' &&
         Array.isArray(snapshot.repeatWeekdays)