chore: small frontend improvements

[mds1]

• The default form data is present in dev mode but not in production, so no changes needed there.
• Add banner linking to signup page for more info https://www.scopelift.co/cove
• Add a tooltip explaining partial vs full match. The tooltip is very narrow, I think it's getting constrained by the flexbox it's in. @alexkeating @wildmolasses if either of you can fix it quickly that'd be great, but I don't think it's worth spending much time on
• Stricter lint rules

Let me know any other tweaks we want to add to this PR

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[alexkeating]

I think the issue is the relative, and absolute, but not a 100% how to fix as I am not well versed in tailwind

[alexkeating]

Looks good to me