Fixes DeviceNamingMode UI state tracking and defaults

Updates the FFU UI core to better track the loaded `DeviceNamingMode` configuration.
Introduces flags to detect explicit user changes versus default states.
Ensures that if the user does not explicitly set the device naming mode, it defaults gracefully and preserves legacy script behaviors.
Updates documentation to reflect the actual behavior of not writing the `DeviceNamingMode` key unless modified.

FFUDevelopment/BuildFFUVM_UI.ps1

@@ -46,7 +46,8 @@ $script:uiState = [PSCustomObject]@{
         logStreamReader             = $null;
         pollTimer                   = $null;
         currentBuildProcess         = $null;
-        lastConfigFilePath          = $null
+        lastConfigFilePath          = $null;
+        loadedDeviceNamingMode      = $null
     };
     Flags              = @{
         installAppsForcedByUpdates        = $false;
@@ -56,7 +57,9 @@ $script:uiState = [PSCustomObject]@{
         lastSortAscending                 = $true;
         isBuilding                        = $false;
         isCleanupRunning                  = $false;
-        isFluentSupported                 = $false
+        isFluentSupported                 = $false;
+        deviceNamingModeWasExplicitlyChanged = $false;
+        suppressDeviceNamingChangeTracking   = $false
     };
     Defaults           = @{};
     LogFilePath        = "$FFUDevelopmentPath\FFUDevelopment_UI.log"