Use hard ends on event bars when they cross between weeks.

src/components/EventOverlay.vue

@@ -11,7 +11,10 @@
         :key="span.id + '-' + (span.n != null ? span.n : 0)"
         class="event-span"
         dir="auto"
-        :class="[`event-color-${span.colorId}`]"
+        :class="[
+          `event-color-${span.colorId}`,
+          { 'cont-prev': span.hasPrevWeek, 'cont-next': span.hasNextWeek },
+        ]"
         :data-id="span.id"
         :data-n="span.n != null ? span.n : 0"
         :style="{
@@ -58,8 +61,21 @@ const eventSegments = computed(() => {
   props.week.days.forEach((day, di) => {
     day.events.forEach((ev) => {
       const key = ev.id + '|' + (ev.n ?? 0)
-      if (!spanMap.has(key)) spanMap.set(key, { ...ev, startIdx: di, endIdx: di })
+      if (!spanMap.has(key)) {
-      else spanMap.get(key).endIdx = Math.max(spanMap.get(key).endIdx, di)
+        // Track min/max nDay (offset inside the occurrence) to know if the span is clipped by week boundaries
+        spanMap.set(key, {
+          ...ev,
+          startIdx: di,
+          endIdx: di,
+          minNDay: ev.nDay,
+          maxNDay: ev.nDay,
+        })
+      } else {
+        const sp = spanMap.get(key)
+        sp.endIdx = Math.max(sp.endIdx, di)
+        if (ev.nDay < sp.minNDay) sp.minNDay = ev.nDay
+        if (ev.nDay > sp.maxNDay) sp.maxNDay = ev.nDay
+      }
     })
   })
   const spans = Array.from(spanMap.values())
@@ -67,6 +83,15 @@ const eventSegments = computed(() => {
   spans.forEach((sp) => {
     sp.startDate = props.week.days[sp.startIdx].date
     sp.endDate = props.week.days[sp.endIdx].date
+    // Determine if this span actually continues beyond the visible week on either side.
+    // If it begins on the first day column but its first occurrence day offset (minNDay) > 0, the event started earlier.
+    sp.hasPrevWeek = sp.startIdx === 0 && sp.minNDay > 0
+    // If it ends on the last day column but we have not yet reached the final day of the occurrence (maxNDay < days-1), it continues.
+    if (sp.days != null) {
+      sp.hasNextWeek = sp.endIdx === 6 && sp.maxNDay < sp.days - 1
+    } else {
+      sp.hasNextWeek = false
+    }
   })
   // Sort so longer multi-day first, then earlier, then id for stability
   spans.sort((a, b) => {
@@ -490,6 +515,16 @@ function applyRangeDuringDrag(st, startDate, endDate) {
   touch-action: none;
 }
 
+.event-span.cont-prev {
+  border-top-left-radius: 0;
+  border-bottom-left-radius: 0;
+}
+
+.event-span.cont-next {
+  border-top-right-radius: 0;
+  border-bottom-right-radius: 0;
+}
+
 /* Inner title wrapper ensures proper ellipsis within flex/grid constraints */
 .event-title {
   display: block;