docs(skills): gate accessibility and bound aesthetics in frontend-design

Two audit fixes. Accessibility moves from an optional reference for interactive components to a required WCAG 2.2 gate before handoff, covering keyboard, focus visibility and not-obscured, target size, contrast, reduced motion, labels, and semantics, for all frontend work. references/accessibility.md gained the backing detail and moved from 2.1 to 2.2. A new "creative but bounded" section keeps the maximalist directions as tools within guardrails: domain fit, readability, responsive stability, and no decoration that degrades the workflow.

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