feat(settings): refine density, group detailed options and add edge maximize gestures

shell/ferese-settings/src/tray_controls.rs

@@ -73,7 +73,7 @@ impl App {
             }
         }
         let mut out = column([])
-            .spacing(8)
+            .spacing(12)
             .push(self.panel_heading(t("Application icons"), 15.));
         for app in apps {
             let visible = !hidden.contains(&app.id);