Refactors model filter event handling to core module

Moves the `TextChanged` event handler for the driver model filter from the UI script to the core `Register-EventHandlers` function.

This change centralizes the logic and makes the handler more generic by retrieving the UI state from the window's tag instead of relying on a global variable.

FFUDevelopment/BuildFFUVM_UI.ps1

@@ -169,10 +169,6 @@ $window.Add_Loaded({
         $script:uiState.Controls.spModelFilterSection.Visibility = 'Collapsed'
         $script:uiState.Controls.lstDriverModels.Visibility = 'Collapsed'
         $script:uiState.Controls.spDriverActionButtons.Visibility = 'Collapsed'
-        $script:uiState.Controls.txtModelFilter.Add_TextChanged({
-                param($sourceObject, $textChangedEventArgs)
-                Search-DriverModels -filterText $script:uiState.Controls.txtModelFilter.Text -State $script:uiState
-            })
         $script:uiState.Controls.btnDownloadSelectedDrivers.Add_Click({
                 param($buttonSender, $clickEventArgs)