Handle partial connections better

[makermelissa]

For USB and possibly BLE, we require the user to perform at least 2 steps to connect. If the user cancels in the middle of this, I'm not sure if this is being handled properly. Additionally, the UI could use some improvement to better inform the user that a step is complete.
I don't think this affects Web Workflow because it's basically 1 step, though I suppose if the user fails to type in credentials it may not be handled properly, so that should probably be checked too, though I imagine the result is they'll either get an error or it will prompt them again next time.

Here's what I think needs to be fixed for this issue to be complete:

• If the user closes the dialog early, a disconnect should be performed
• Check that Web Workflow is properly handled if the credentials dialog is dismissed
• As the user completes steps, something like a checkmark should visually inform the user that it is complete
• If the instructions are on a small screen like a phone, it should scroll to the next step the user is expected to do
• Fix it if there is an issue so that the user knows what to do