fix(e2e): repair failing suite — a11y fixes and stale assertions

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.

app/pages/admin/events/create.vue

@@ -350,6 +350,7 @@
               <label>New tag pool</label>
               <USelect
                 v-model="newTagPool"
+                aria-label="New tag pool"
                 :items="[
                   { label: 'Cooperative', value: 'cooperative' },
                   { label: 'Craft', value: 'craft' },

app/pages/join.vue

@@ -153,7 +153,6 @@
 
                 <ul
                   class="pwyc-list"
-                  role="radiogroup"
                   aria-label="Contribution amount"
                 >
                   <li