Describe the usability problem
If someone uses an uppercase .ETH address in the Add Contact screen, it's not recognized.

Screenshots

Expected behavior
I think it should be case insensitive, so it Just Works TM if someone gives me their address in all caps and I paste it. As it was, I had to guess why it was not working and try changing the extension.

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User impact | Usage frequency | Feasibility scores
How important is this to the user, what the user wants to accomplish | Daily, weekly, monthly | Small, medium, large