feat: use raised with border style for top and bottom toolbars

Author: tfuxu

data/resources/ui/window.blp

@@ -17,6 +17,8 @@ template $GeopardWindow: Adw.ApplicationWindow {
 
         Adw.ToastOverlay toast_overlay {
           Adw.ToolbarView toolbar_view {
+            top-bar-style: raised_border;
+            bottom-bar-style: raised_border;
             reveal-bottom-bars: false;
 
             [top]