feat: implement HLS streaming support in VideoPlayer and enhance stream URL handling

k-tv-frontend/hooks/use-tv.ts

@@ -80,9 +80,13 @@ export function findNextSlot(
  * Returns null when the channel is in a gap (no-signal / 204).
  */
 /**
- * slotId is in the query key so the URL refetches when the playing item
- * changes (new slot starts), but stays stable while the same item runs —
- * no mid-item restarts.
+ * Resolves the stream URL for the current slot, with StartTimeTicks set so
+ * Jellyfin begins transcoding at the correct broadcast offset.
+ *
+ * slotId is in the query key: the URL refetches when the item changes (new
+ * slot), but stays stable while the same slot is playing — no mid-item
+ * restarts. offsetSecs is captured once when the query first runs for a
+ * given slot, so 30-second broadcast refetches don't disturb playback.
  */
 export function useStreamUrl(
   channelId: string | undefined,