feat: selectOption works with role=radiogroup widgets

[DavertMik]

Makes I.selectOption('Density', 'Comfortable') work on role=radiogroup widgets — the shape both Radix and Base UI render for a radio group, and the shape Radix Toggle Group takes in single mode.

Until now selectOption understood two ARIA shapes, combobox and listbox, and anything else fell through to the native <select> path, which failed with locator.selectOption: Error: Element is not a <select> element.

What changed

role=radiogroup becomes a third rung of the fuzzy locator ladder and a third branch of proceedSelect, in Playwright, WebDriver and Puppeteer alike. The branch clicks the descendant role=radio whose accessible name matches the option, mirroring the existing listbox branch down to the debugSection output.

Two details worth calling out:

• Exact name first, substring second. Playwright's getByRole name option defaults to a case-insensitive substring, so 'Compact' would otherwise be answered by a sibling named 'Compact mode'. The fixtures put 'Compact mode' ahead of 'Compact' in DOM order so the test is a real guard rather than a coincidence.
• An array of options is refused. A radio group holds one value; clicking each entry in turn would silently leave only the last one selected, so two or more options raise an error instead. An option that matches nothing raises ElementNotFound rather than timing out on a click.

Tests

test/helper/webapi.js, #selectOption - radiogroups, run by all three helpers. Three fixtures under test/data/app/view/form/radiogroup/:

• plain.php — hand-written div[role=radiogroup] with button[role=radio], plus a native <select> on the same page as a regression guard
• radix.php — Radix RadioGroup and ToggleGroup in single mode
• baseui.php — Base UI RadioGroup, which also renders the aria-hidden mirror inputs

Assertions read aria-checked off every radio in the group, so a step that passes without changing anything fails. Coverage: select by label, switch the selection, a group named by aria-labelledby, a strict CSS locator on the group, an unknown option, an array of two options, and a native <select> untouched.

The Radix and Base UI fixtures pull the real libraries from esm.sh through an importmap, following the convention set by #5701 — so these three tests need network at run time, as the combobox ones already do.

Local results

test:unit, lint, and the full #selectOption set green on Playwright, Puppeteer and WebDriver. No isHelper guards were needed: every case passes on all three helpers.

Part of the batch from the shadcn/Radix/Base UI component survey (§5 P7).

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