- weather.cpp: StaticJsonDocument → JsonDocument (ArduinoJson v7 API) - display.cpp: daylightStr buffer 16 → 32 bytes (suppress GCC sprintf warning) - ntp_client.cpp: remove unused weekday variable Applied manually due to repo layout mismatch in original PR. Co-authored-by: waltje <waltje@users.noreply.github.com> Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>