adobe / spectrum-web-components / 28969080681

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fix(tabs): default keyboard-activation to automatic, matching React Spectrum (#6476)

<swc-tabs> inherited keyboard-activation="manual" as its default from
1st-gen sp-tabs' auto=false, not from a deliberate accessibility decision.
React Spectrum/React Aria Tabs defaults to automatic activation, and
swc-tab-panel content is always present in the light DOM (not lazily
mounted), which is the condition the WAI-ARIA APG recommends for
automatic activation. Flip the default to automatic and document manual
as consumer guidance for expensive/lazy-loaded panels instead.

Co-authored-by: Rajdeep Chandra <rajdeepc@adobe.com>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
Co-authored-by: Patrick Fulton <360251+pfulton@users.noreply.github.com>

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