Make windows fullscreen on small screens

- Update window components to use fullscreen layout on small screens
- Adjust UI components styling for better mobile display
- Update desktop store for small screen handling

src/components/ui/button/index.vue

@@ -7,6 +7,7 @@
           ...buttonProps,
           ...$attrs,
         }"
+        size="lg"
         @click="$emit('click', $event)"
       >
         <template