Refactor repeater status screen and settings screen; add GPS toggle

- Updated _RepeaterStatusScreenState to load status after the first frame to avoid mid-build notifyListeners() calls.
- Removed unused _statusRequestedAt variable and adjusted _clockText() to use repeaterClockAtLogin for time display.
- Enhanced _SettingsScreenState with a GPS toggle switch that updates custom variables for GPS settings.
- Cleaned up RepeaterCommandService by removing redundant pending command checks and adjusted command ID generation.
- Removed jni plugin from generated_plugins.cmake for both Linux and Windows platforms.

linux/flutter/generated_plugins.cmake

@@ -8,7 +8,6 @@ list(APPEND FLUTTER_PLUGIN_LIST
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST
   flserial
-  jni
 )
 
 set(PLUGIN_BUNDLED_LIBRARIES)