Improve search functionality and pagination reset

The search box now clears when a different system is selected, enhancing the app's usability. Additionally, the pagination reset action has been moved to trigger at the start of the LoadGameFiles function. This change allows for better reliability and consistency in user interactions, as the search function no longer handles the pagination reset.

SimpleLauncher/MainWindow.xaml.cs

@@ -179,6 +179,7 @@ private void MainWindow_Restart()
 
         private void SystemComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
         {
+            SearchTextBox.Text = "";
             EmulatorComboBox.ItemsSource = null;
             EmulatorComboBox.SelectedIndex = -1;
 
@@ -256,6 +257,9 @@ private void EmulatorComboBox_SelectionChanged(object sender, SelectionChangedEv
 
         private async Task LoadGameFiles(string startLetter = null, string searchQuery = null)
         {
+            // Ensure pagination is reset at the beginning
+            ResetPaginationButtons();
+
             try
             {
                 GameFileGrid.Children.Clear();
@@ -493,9 +497,6 @@ public static async void HandleError(Exception ex, string message)
 
         private async void SearchButton_Click(object sender, RoutedEventArgs e)
         {
-            // Reset pagination controls
-            ResetPaginationButtons();
-
             var searchQuery = SearchTextBox.Text.Trim();
 
             if (SystemComboBox.SelectedItem == null)