feat: add toasts

src/preset_row.py

@@ -61,12 +61,23 @@ class GradiencePresetRow(Adw.ActionRow):
 
     @Gtk.Template.Callback()
     def on_remove_button_clicked(self, *_args):
+
+        try:
             os.remove(os.path.join(
                 os.environ.get("XDG_CONFIG_HOME",
                                os.environ["HOME"] + "/.config"),
                 "presets",
                 to_slug_case(self.old_name) + ".json",
             ))
+        except Exception:
+
+            self.toast_overlay.add_toast(
+                Adw.Toast(title=_("Scheme could not be removed!"))
+            )
+        else:
+            self.toast_overlay.add_toast(
+                Adw.Toast(title=_("Scheme successfully deleted!"))
+            )
 
         self.win.reload_pref_group()