polish: make AI interfaces stop looking AI-generated

Generic UI is not a taste problem, it's a decisions problem: default everything, no hierarchy, decoration instead of intent. You fix it by understanding the product first, auditing deliberately, and making a small number of strong decisions: not by sprinkling gradients.

When to use

• "this dashboard looks so generic, fix it"
• "our app screams AI-generated, help"
• "just tidy the dashboard a little, small tweaks only"

When NOT to use