feat: Add and rename screens

- Add windows screen
- Add windows.js
- Different variants of classes for drag and edge snap behaviour
- Rename js files to better distinguish usage

source/screens/demo/examples/ui/drag.liquid

@@ -22,7 +22,7 @@ tags:
 {% endblock %}
 
 {%- block script %}
-<script src="{{ pageBase }}js/_ui.js"></script>
+<script src="{{ pageBase }}js/drag.js"></script>
 <script>
 	// Get the space element
 	const space = document.getElementById('space');