DEFAULT_DAY_START_HOUR/DEFAULT_DAY_END_HOUR only widened the grid's default 08:00-22:00 window for an event outside it, on whichever end that event fell on -- so a single early-morning event (e.g. one starting at midnight) widened the start but left the end clipped at 22:00 rather than covering the full day. Default the window to the full day (0-24) instead; the same expansion logic still guards a pathological almost-midnight-ending event, it just never needs to trigger anymore. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01ECGMEwrc2k4D8VQuwjstj9