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Tune Tabs — sliding indicator
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Why it works
A single shared indicator moves to the measured rect of the active trigger, so the eye follows the choice instead of re-scanning the row.
When to use it
Two to six peer views of the same object.
Things to watch
Full tablist / tab / tabpanel roles with roving focus. Manual activation suits panels that are expensive to render. The slide lives under `no-preference`.
Implementation clues
- measured trigger rect
- transform on a shared indicator
- roving tabindex