The Qlik Sense card template includes a web component named "qliksense-card" which you can put Qlik Sense objects into and has fullscreen functionality similar to what you are used to having in the Qlik Sense client. It's easy to use, and works in dev-hub. You can view a super simple example @ http://webapps.qlik.com/qliksense-card-example/card-example.html
This is a working dev-hub template. You can either download this and add it to your Qlik Sense extensions to use as a template from dev-hub, or use it as boilerplate for a Qlik Sense mashup. The only thing of note the template really contains is the qliksense-card component, so you could also simply borrow that and apply to your own project template.
Just download this project and install as an extension, and it will be available as a template selection when creating a new mashup from dev-hub.
Grab the qliksense-card.html file, and add it to your project, along with the webcomponents-lite.js file for Polymer. You can use the following cdn for that https://cdn.rawgit.com/download/polymer-cdn/1.7.0.2/lib/webcomponentsjs/webcomponents-lite.min.js
Using the component is easy.
<!-- Notice the content-height attribute, which you should set
to the desired height of the qlik component -->
<qliksense-card content-height="300px">
<div class="qvplaceholder" id="QV01"></div>
</qliksense-card>That's it. You just wrap your qlik sense object container with the <qliksense-card> tag.