Biomekka 1.8.25

Fix-only build from 1.8.24.

Changed:
- Moved the ESP dashboard HTML/JavaScript raw string out of the .ino file into dashboard_html.h.
- This avoids Arduino's .ino pre-processor mistaking JavaScript function declarations for C++ functions.
- Kept the 1.8.24 dice polish, uptime formatting, storm lighting ramp, solar self-heal, and dashboard behaviour unchanged.

Not changed:
- No sensor, pin, relay, Goblin command, MQTT topic, telemetry schema, solar logic, storm logic, camera/feed, SSH, Ubuntu/Nginx, or Home Assistant changes.