fix: disallow space only device names

[cimigree]

Fixes #973
Makes sure need to enter some kind of text for device name by using trim()

The Edit Device Name did not need to be adjusted as it already does not allow just a blank space name.

[achou11]

would be a good case to cover via e2e tests, although maybe that's a follow-up since the current onboarding e2e test isn't ported yet?

[cimigree]

would be a good case to cover via e2e tests, although maybe that's a follow-up since the current onboarding e2e test isn't ported yet?

@achou11 I can add it. I have that test ported. Want me to add it before I merge this in? You want to approve it?

[achou11]

@achou11 I can add it. I have that test ported. Want me to add it before I merge this in? You want to approve it?

Ah great! No strong preference if done here or as a follow-up