Readd function that had gone missing in refactoring.

src/components/CalendarView.vue

@@ -193,6 +193,17 @@ function finalizeDragAndCreate() {
   removeGlobalTouchListeners()
 }
 
+// Build a minimal event creation payload from current selection
+// Returns null if selection is invalid or empty.
+function createEventFromSelection() {
+  const sel = selection.value || {}
+  if (!sel.startDate || !sel.dayCount || sel.dayCount <= 0) return null
+  return {
+    startDate: sel.startDate,
+    dayCount: sel.dayCount,
+  }
+}
+
 function getDateUnderPoint(x, y) {
   const el = document.elementFromPoint(x, y)
   let cur = el