Replace aria-valuetext with aria-description for improved accessibility

[ronald-urbina]

Replace aria-value with aria-description for improved accessibility resolve 1280

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Note

Low Risk
Low risk: small, localized accessibility attribute change on media-time-display with no behavioral logic changes beyond what ARIA attribute is updated.

Overview
Updates media-time-display to stop writing time announcements to aria-valuetext and instead maintain an aria-description that reflects current/remaining time and optional duration, including an explicit "video not loaded" description when time data is unavailable.

Renames the helper from updateAriaValueText to updateAriaDescription and wires the new function into the component update() path so the description stays in sync with frequent time updates.

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