Add accessible tooltip trigger pattern for creator metric explanations

[aniokedianne]

Summary
Creator metric labels that need additional explanation use tooltip triggers that are not keyboard or screen-reader accessible. Applying a consistent accessible trigger pattern ensures all users can access metric explanations.

Scope

• identify creator metric elements that use tooltip triggers for explanations
• apply an accessible trigger pattern using a focusable element with aria-describedby
• verify the tooltip content is announced by screen readers on focus

Acceptance Criteria

• metric explanation tooltips are reachable and dismissible via keyboard
• screen readers announce the tooltip content when the trigger is focused
• the visual appearance of the trigger is unchanged

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

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