fix: remove aria-hidden from span helper

[deleonio]

Summary

• drop the aria-hidden attribute from the KolSpan expert slot container so screen readers only pick up the hidden flag
• refresh the affected snapshots for span, badge, button, link and tooltip to reflect the updated markup

Testing

• pnpm --filter @public-ui/components test:unit -- --updateSnapshot

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https://chatgpt.com/codex/tasks/task_e_68db17bc1f94832bb36e62d69202f741

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

[P1] Preserve aria-describedby content for screen readers

The span that contains _ariaDescription was changed from class="visually-hidden" to hidden. Because the button’s aria-describedby points at this element, setting hidden removes it from the accessibility tree and screen readers stop announcing the description whenever _ariaDescription is used. The previous visually-hidden class kept the text off-screen but still exposed to assistive tech, which is required for aria-describedby to work.

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[github-actions]

Netlify Draft Deployment
URL: https://68db1e120265b843c91cb8d4--kolibri-public-ui.netlify.app
Logs: https://app.netlify.com/projects/kolibri-public-ui/deploys/68db1e120265b843c91cb8d4

[deleonio]

#8572