Three product a11y defects: drop role="radiogroup" from the /join PWYC
<ul> (it stripped the list role; native radios already group), use
--parch-text on the active contribution chip (was --text-bright, 1.17:1
on --parch), and label the New tag pool USelect on event create.
Three stale tests: real event-type filter labels, updated location
placeholder, and click the label instead of the hidden 0×0 radio.
Add data-testid hooks for the contribution amount input and cadence
toggle labels so playwright can target them through useId-generated
ids. Update join-flow.spec.js to use the new selectors and to assert
the new billing-summary copy ('at each annual renewal' / 'each month'),
dropping the obsolete '/month x 12' parenthetical.
