Focused v2.4.2 polish release.\n\n- Stable daily high/low range: Nimbus preserves the widest valid daily forecast range seen for each source/date instead of letting lows follow current or remaining hourly values.\n- Grey moon forecast icons: forecast and modal moon icons now better match the large grey moon while keeping the existing phase/terminator logic.\n- Aurora curtain polish: reworked aurora into a higher cyan/green layered curtain with larger curved motion and no pink/purple mass.\n- Restart range guard: temporary invalid daily ranges during Home Assistant restarts/updates are ignored when stable daily data is already available.\n- README demo updated with the new aurora animation.