Biomekka 1.8.29

Base: rolled back to uploaded Biomekka 1.8.27, not the temporary 1.8.28 lighting-preview branch.

Changed:
- Storm lightning colour retuned to pure white instead of blue-white.
- Lightning glow/tail/outer scales increased for much brighter storm flashes.
- Adjacent row spill strengthened.
- Added a low-level full-strip white ambient flash during active storm strikes only, so lightning feels much brighter without changing normal lighting colours.

Not changed:
- No pins, relays, Goblin commands, sensors, MQTT, telemetry schema, dashboard layout, solar logic, storm timing/eligibility, SSH, Ubuntu/Nginx, or HA changes.