First of all, note that the Dandelion configuration file (dandelion.properties) must locate under the src/main/resources/dandelion folder. Once fixed, you should see all bundles loaded. Remember that you can use the bundle graph viewer anywhere in the application to see what bundle/assets are to be injected by Dandelion.
In the above bundle, the "jqueryui" bundle is brought by Dandelion-Datatables as a vendor bundle. But you can actually prepare some custom vendor bundles too, by putting them under the src/main/resources/dandelion/vendor folder. See the bundle loader section of the docs.
2) include this bundle everywhere you need to display a datepicker