Flag overnight blocks in the v2 schedule API

src/lib/server/v2-serializers.ts

@@ -1,4 +1,4 @@
-import { toHm } from '$lib/schedule-utils';
+import { blockDuration, isOvernight, toHm } from '$lib/schedule-utils';
 
 // Canonical solfeggio id <- Hz, mirroring the kiosk's `frequencyIdForHz()`
 // map (radiantwave-rebuild src/audio/audio_downloader.cpp). v2 must emit these
@@ -147,6 +147,8 @@ export type V2ScheduleBlock = {
 	startMinutes: number;
 	endTime: string;
 	endMinutes: number;
+	overnight: boolean;
+	durationMinutes: number;
 	proclamationIds: string[];
 };
 
@@ -156,7 +158,9 @@ export type V2Schedule = {
 };
 
 /** Build a schedule Block for the kiosk. Only the selected Proclamation IDs are
- * returned; the kiosk fetches proclamation content separately. */
+ * returned; the kiosk fetches proclamation content separately. `overnight`
+ * marks a range that crosses midnight (end clock time before start), and
+ * `durationMinutes` counts the wrap as the next day. */
 export function serializeScheduleBlock(
 	block: { id: string; startMinutes: number; endMinutes: number },
 	proclamationIds: string[]
@@ -167,6 +171,8 @@ export function serializeScheduleBlock(
 		startMinutes: block.startMinutes,
 		endTime: toHm(block.endMinutes),
 		endMinutes: block.endMinutes,
+		overnight: isOvernight(block),
+		durationMinutes: blockDuration(block),
 		proclamationIds
 	};
 }