Better mobile slider handling

src/lib/widgets/CheckboxWidget.svelte

@@ -6,6 +6,7 @@
  import { get, type Writable, writable } from "svelte/store";
 
  export let widget: WidgetLayout | null = null;
+ export let isMobile: boolean = false;
  let node: ComfyCheckboxNode | null = null;
  let nodeValue: Writable<boolean> | null = null;
  let attrsChanged: Writable<boolean> | null = null;