Lunie: show a message if user is logged in with address that isn't in the chrome extension

[jbibla]

Is your feature request related to a problem? Please describe.
Yes. The problem is that there are multiple ways to tell Lunie you have an address. This presents many opportunities for conflict.

Describe the solution you'd like

If a user signs in with an address and proceeds to make a transaction, the action modal should inform the user that the address they have logged in with is not _in_ the extension and will therefore not work.

We shouldn't let the user send a tx to the extension if the addresses don't match, which we can tell in advance.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[jbibla]

this is a simple but important ux improvement.

[colw]

Design idea:

• Keep both signing options present
• When extension selected:
  
  
  
  • Disable sign button
  
  
  • Display message explaining why
  
  

[jbibla]

can you also make sure that if a user signs in with the extension that "extension" is the default option pre-selected for them? might already work...