a11y | A18 show session delete without hover

[BrianGenisio]

Summary

Closes #72 (A18). Session delete stayed opacity: 0; pointer-events: none until hover or :focus-visible. Keyboard users could reach it; touch users on devices without hover could not.

Changes

• Under @media (hover: none), delete is visible and tappable. Hover-to-reveal on pointer devices and the :focus-visible keyboard path stay as they are.
• CSS-source test guards the media-query rule (jsdom cannot emulate (hover: none)).

Test plan

• npm test
• Touch / hover-none: delete is visible on each session row and activates
• Pointer + hover: delete still reveals on row hover
• Keyboard: Tab to delete, :focus-visible still shows it
• Light and dark
• Confirm axe baseline does not grow

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📥 Commits

Reviewing files that changed from the base of the PR and between 86fcc05 and c689440.

📒 Files selected for processing (3)

• a11y-audits/8-5-26/wave-4-plan.md
• public/app.css
• tests/dom/session-delete-a18.test.js

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