Default New Project install path and/or project name fails

[dclear]

What happened (or feature request):

Default New Project install path and/or project name are rejected without explanation

• [x] change the copy here to make it clear its example text
• [x] CSS styling to make clear its placeholder text
• [ ] error explanation

[alkymst]

[alkymst]

@dclear I still need to show the helper text and the error state. I'll post those today.

[alkymst]

I moved this to the next release to allow for time on the new design.