Biomekka 1.8.30 quiet-night patch

Changed:
- Quiet mode no longer dims the whole lighting system to 10%.
- When quiet mode is ON and local time is 20:00-10:00, RGB LEDs are forced black.
- During that same quiet-night window, COB target PWM is forced to 0.
- Normal lighting phases, fades, transitions, schedule maths, and state updates still continue underneath the blackout.
- Quiet mode during daytime no longer blocks normal lighting or storm lottery behaviour.
- Storms/pre-storms are blocked during quiet-night mode.
- Any storm already running when quiet-night mode becomes active is stopped.
- HA storm override is rejected during quiet-night mode.
- Serial storm/prestorm commands are rejected during quiet-night mode.
- Door-open COB override is also forced to 0 during quiet-night mode.
- Added dashboard JSON field: quiet_night_active.

Not changed:
- No pin changes.
- No Goblin command changes.
- No sensor changes.
- No normal day/night colour tuning changes.
- No humidity, fan, heater, spray, mist, rain, MQTT topic, or dashboard layout changes.

Important:
- Quiet-night window depends on the ESP having sane local time/NTP.