Summary

• make shared table-header overflow tooltips reachable by keyboard
• allow sortable headers to sort with Enter and Space and expose the current sort state
• keep drag and resize interactions isolated from sorting
• preserve explicit labelProps accessibility and keyboard behavior

Behavior

• header labels become focusable when they can expose a tooltip or sort
• tooltips still open only when the rendered header is truncated
• custom aria-label, role, tabIndex, and onKeyDown behavior remain supported
• custom handlers can prevent the built-in keyboard sort action
• non-sortable React headers without tooltip text do not become inert tab stops
• drag handles use a dedicated data attribute instead of a styling class for interaction detection
• no per-header observer or tooltip controller is added

Scope

This is a focused accessibility and compatibility follow-up to #631. It applies to every application table using the shared Table header and does not alter row rendering, virtualization, sizing, or data behavior.

Related cloud cleanup follow-up: netdata/cloud-frontend#5611. The PRs are independently mergeable.

Validation

• 92/92 suites passed
• 464/464 tests passed
• 9/9 snapshots passed
• UMD, CJS, and ES6 builds passed
• integrated cloud development build passed