Biomekka 1.8.12

- Renamed main sketch for Arduino folder/sketch matching: biomekka_1_8_12/biomekka_1_8_12.ino.
- Changed dashboard main light card from raw PWM (/255) to percentage.
- Changed dashboard main light history graph and tooltip from raw PWM (/255) to percentage.
- Added explicit cob_pct to /status and /history while keeping cob_pwm for compatibility.
- Added storm countdown/timer/roll values to /status so the storm window has real data.
- Reworked storm dice animation so it rapidly rolls numbers before settling on the actual roll.
- No pin, relay, camera, go2rtc, Nginx, sensor, MQTT, Home Assistant, or telemetry endpoint changes.