Add volume control to main Owntone device instance cards

I use Owntone/forked-daap daily and would like to improve the waf and family acceptance factor by giving easy access to on/off and volume control of the many airplay/shairport-sync/chromecast devices around the house. I am hoping this request will get forwarded to the Onwntone integration developer uvjustin at uvjustin · GitHub.

I used to use TuneBlade but it lacks support for many devices and does not seem to be in development anymore although they do answer support questions so Owntone has been an awesome replacement. Currently I use the device web page of Owntone as a Chrome app on the desktop but there is no way to configure the default web page to be the devices page so that is an extra click to get to the devices page and not something easy to set up on guests and family iphones.

I moved all of the Owntone cards to the top of the Home->Overview page so they are the first things that come up in the HA iPhone app. The only piece missing is being able see and control all of the volume controls at a glance on the Overview page, so that is the enhancement I am requesting here. Having to click into each device to access the volume controls greatly reduces mine and the family acceptance factor.

In the screen shot I have a rough pencil in of what I am requesting in the first device listed.

Thanks to the HA teams and uvjustin for all the development and support!