fx-switch tabs

Setting appearance="tabs" on fx-switch turns it into a proper ARIA tabs widget: the switch renders role="tablist" around its fx-trigger children, each trigger's widget gets role="tab" and aria-selected, and each targeted fx-case gets role="tabpanel" plus aria-labelledby pointing back to its tab. Arrow keys (Left/Right/Up/Down/Home/End) move focus between tabs and activate the corresponding case, following the WAI-ARIA "automatic activation" tabs pattern. This requires the fx-trigger/fx-toggle pairs to be direct children of fx-switch, alongside the fx-case elements they target - plain fx-switch usage elsewhere (bound switches, wizards, accordions) is unaffected.

Keyboard: Tab into the strip to focus the selected tab, then use ←/→ (or ↑/↓) to move between tabs - moving focus also activates the corresponding case. Home/End jump to the first/last tab.

Focused tab:

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