Improve APY dashboard table accessibility

[donglrd]

Summary:

• Adds accessible table sort buttons with aria-sort, aria-pressed, and descriptive labels.
• Makes risk tooltip and stale APY status easier to use with assistive tech.
• Respects reduced-motion preference for dashboard entry and row animations.
• Adds a regression test for the table accessibility behavior.

Testing:

• npm test -- --run src/components/dashboard/tests/ApyDashboard.test.tsx
• npx eslint src/components/dashboard/ApyDashboard.tsx src/components/dashboard/tests/ApyDashboard.test.tsx

Notes:

• npm run lint and npm run build are currently blocked by existing unrelated lint/type errors elsewhere in the client.

Fixes #542

[vercel]

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