fix: strengthen keyboard focus accessibility

[corwinm]

Summary

• add explicit focus-visible rings to profile links and linked section headings
• add the same keyboard focus treatment to icon-only footer links and the share button
• give every icon-only footer control an explicit accessible name
• add regression coverage for the focus and naming contracts

Test plan

• pnpm lint
• pnpm typecheck
• pnpm test — 31 tests passed
• pnpm build
• browser keyboard smoke check:
  • tabbed to a linked section heading, profile link, and footer social link
  • confirmed each renders a 2px blue ring with a 2px contrasting offset
  • confirmed footer controls expose LinkedIn, GitHub, Bluesky, Facebook, and Share this page names

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Project	Deployment	Actions	Updated (UTC)
corwinm-remix	Ready	Preview, Comment	Jul 13, 2026 7:57pm