fix(widget): forward End for all-day multi-day calendar events

A genuine all-day Google Calendar event spanning multiple days (e.g. a
3-day conference) never got its EndTime forwarded to the widget client,
since the conversion only set End when !IsAllDay. The client has no way
to detect a multi-day span without both Start and End.

1 files changed, 31 insertions, 2 deletions

diff --git a/internal/handlers/widget_test.go b/internal/handlers/widget_test.go
index 4e08d2a..2a6967e 100644
--- a/internal/handlers/widget_test.go
+++ b/internal/handlers/widget_test.go
@@ -174,8 +174,9 @@ func TestTimelineItemToWidgetItem_Event(t *testing.T) {
 // IsAllDay item regardless of type, which meant the widget client's
 // hourly-slot packer had no date information to pin all-day events to the
 // top of the correct day and they could silently fall outside the visible
-// grid range instead. End stays nil since there's no meaningful end time to
-// show for an all-day item.
+// grid range instead. This fixture's End stays nil only because it has no
+// EndTime set -- see TestTimelineItemToWidgetItem_MultiDayAllDayEvent_ForwardsEnd
+// for the case where a multi-day all-day event has a real EndTime.
 func TestTimelineItemToWidgetItem_AllDayEvent(t *testing.T) {
 	day := time.Date(2026, 7, 12, 0, 0, 0, 0, time.Local)
 	item := models.TimelineItem{
@@ -206,6 +207,34 @@ func TestTimelineItemToWidgetItem_AllDayEvent(t *testing.T) {
 	}
 }
 
+// TestTimelineItemToWidgetItem_MultiDayAllDayEvent_ForwardsEnd proves that a
+// genuine all-day CALENDAR EVENT with a real EndTime (e.g. a 3-day
+// conference with no specific time) still gets End forwarded to the widget
+// client, even though IsAllDay is true -- needed so the client can detect
+// the multi-day span and render "starts"/"ends" labels per day.
+func TestTimelineItemToWidgetItem_MultiDayAllDayEvent_ForwardsEnd(t *testing.T) {
+	start := time.Date(2026, 7, 12, 0, 0, 0, 0, time.Local)
+	end := time.Date(2026, 7, 15, 0, 0, 0, 0, time.Local)
+	item := models.TimelineItem{
+		ID:       "cal-conference",
+		Title:    "Offsite",
+		Source:   "calendar",
+		Type:     models.TimelineItemTypeEvent,
+		Time:     start,
+		EndTime:  &end,
+		IsAllDay: true,
+	}
+
+	wi := TimelineItemToWidgetItem(item)
+
+	if wi.End == nil {
+		t.Fatal("expected End to be forwarded for a multi-day all-day event")
+	}
+	if !wi.End.Equal(end) {
+		t.Errorf("End = %v, want %v", *wi.End, end)
+	}
+}
+
 // TestTimelineItemToWidgetItem_AllDayTask_KeepsFloatingBehavior proves the
 // same fix does NOT change behavior for undated doot/gtask tasks, which are
 // also flagged IsAllDay as a "no specific time" fallback (see