Release v3.9.3

Changes:

• Update HA discovery for HA2025.10+ by @hmmbob
• add input validation for SSID and password fields
• allow special characters in password strings. fixes #287
• improve Auto 1P/3P switching logic
• show additional Contact 2 information on LCD while in setup menu.
• Add custom OCPP key (ConfigureMaxCurrent) to configure MaxCurrent of the controller
• implement efuse serial number fallback logic
• Erase RFID cards when performing a /erasesettings
• Refactor event handling for reboot and help links Author: @kozmoz
• Improve mode button responsiveness #283 Author: @kozmoz
• replace blocking getLocalTime(), with non-blocking code. fixes SmartEVSE#110
• show dashed line while Capacity limit is active. show Solar or Capacity timer.
• improve solar charging logic, and disconnect CP while 1P-3P switching.
• Switch off LCD backlight (after 2 min) while waiting for solar
• add PILOT_SHORT constant and update pilot checks, fixes #280
• enhance WiFi setup HTML form with responsive design and improved styling
• add MQTT selector for EnableC2

Thanks @dingo35, kozmoz, hmmbob for their contributions.