Add frontend UI skills review document

Commit notes

Comprehensive review of frontend code against UI Skills constraints:

- Stack: No violations found - Components: 6 violations (missing aria-labels on icon-only buttons) - Interaction: 3 violations (confirm() usage, backdrop-blur on large surfaces) - Animation: 4 violations (transition-all, duration exceeding 200ms) - Typography: 2 violations (missing text-balance/text-pretty) - Layout: 2 violations (arbitrary z-index, w-* h-* instead of size-*) - Performance: 2 violations (backdrop-blur surfaces) - Design: 3 violations (gradients without explicit request)

Includes detailed code snippets, explanations, and suggested fixes.

Co-authored-by: armin.naimi <[email redacted]>