Set default server for lovalace interface. When using multiple servers.

**Is your feature request related to a problem? Please describe.**

I manage three Home Assistant instances. One at home, an two at my families. The possibility to have all three of them inside the Home assistant app, is fantastic.
All three instances use mostly the entities card. Which gives them a similar appearance.

Some time ago when I was busy. And I wanted to quickly turn on the lights in the Livingroom. I opened the app. I turned on all the lights in my Livingroom, but nothing happened. I tried it again. But still nothing happened. When I looked why the lights didn’t respond. I realised that the Home Assistant app wasn’t showing my Lovelace dashboard. I had toggled the lights at my family’s home.

**Describe the solution you'd like**

I would like to be able to select an default Home assistant server for the Lovelace dashboard. If it is possible, I would like it to have those three options:

One:
There is no default server. Home Assistant opens the last server you used. Just like it is now.

Two:
You select an default server. Every time you open the app, it automatically opens the Lovelace dashboard on the selected server.

Three:
Show the Lovelace dashboard of the Home assistant server which is currently using the internal url. If there is no server connected through the internal url than open the selected default server.

Personally I use the app mostly for my own Home Assistant. I only use the app with my family’s Home Assistant when I’m at my family’s home. Which makes the third option very useful.

**Describe alternatives you've considered, if any**

Another option could be that you can enable a boolean within the server settings in the app.

Turn on the boolean, Home assistant will use this server by default. Turn off the boolean and Home Assistant will use the last used server. which are actually function one and two mentioned above.

**Additional context**

I just have no idea how option three should work if multiple home assistants are using the internal url.