Removed many legacy in-app configuration and firmware workflow UI components and migrate users to external/browser-based tools. Deleted several dialog and helper classes (BackupConfiguration, FirmwareInstallation, LightSet, PixelConfiguration, PixelTestPattern, multiple Wizard* classes, UdpDmxTransmit, RestoreConfiguration, etc.). Simplified RemoteConfig: removed built-in backup/firmware/workflow handlers and replaced them with menu actions that open external URLs (fetch_configs.py and firmware release page); removed other deprecated menu actions and related logic. Updated BroadcastSelect layout and removed the "Enable DHCP" action. Updated About text to indicate legacy/browser usage and bumped copyright years (2019-2026).