Updated the PCB layout placement: added R3 10k pull-down, added 2 mounting holes, resized to 80 × 55 mm, placed ESP32/control side left, PC817 center, and J1 at the right board edge with left-to-right flow.
Open items:
Routing is not completed because the autorouter is blocked by an active completed layout job in Flux.
Airwires remain until routing can run.
Pin mapping is verified correct: GPIO5 → R1 → PC817 AN, PC817 CAT → ESP32_GND, PC817 COL/EM → J1.
Suggested next steps:
Clear/discard the active auto-layout job in the Flux UI, then ask me to route again.
After routing, verify no traces cross the isolation corridor or ESP32 antenna area.