Biomekka 1.8.39 - Trickle hard schedule

Base: uploaded Biomekka 1.8.36 FIXED_RANDOM_STORM_1_LED_AUDIT.

Changes:
- Added ESP-owned trickle bar scheduler.
- ESP sends Goblin TRICKLE:ON for 30 seconds every 3 minutes.
- Scheduler runs unconditionally at the very start of loop().
- No humidity, storm, quiet-mode, door-open, lighting, rain, mist, spray, or manual-output lockouts can block trickle scheduling.
- Added serial commands: trickle, trickle on, trickle off, trickle status.
- syncGoblinState() now also re-sends the current TRICKLE state so Goblin relay state is refreshed during normal 5s syncs.

Notes:
- Goblin firmware must already support TRICKLE:ON and TRICKLE:OFF on D10.
- This patch does not change pin assignments, storm logic, lighting colours, cloud layer code, telemetry schema, dashboard layout, heaters, mist, rain, spray, or fan control.