a11y: Shield/button semantics review

[ArchILLtect]

Summary

Review keyboard activation, focus outline, roles/labels, and contrast for shield controls.

Motivation / Problem

• Ensure accessibility compliance and good keyboard UX beyond base tests.

Acceptance Criteria

• Keyboard activation works; focus outline visible; roles/labels correct; contrast OK.

Target Release

v0.4.0

Notes / Links

• Files: src/components/StoryCard.tsx