merge: worktree-a11y-fixes into main

Accessibility fixes (aria-labels, color contrast, html lang, inline link
underlines), atomic dev login endpoints, and E2E test hardening.

app/pages/admin/events/create.vue

@@ -96,7 +96,7 @@
               <label> Event Type <span class="required">*</span> </label>
               <USelect
                 v-model="eventForm.eventType"
-                aria-label="Event Type"
+                aria-label="Event type"
                 :items="[
                   { label: 'Community Meetup', value: 'community' },
                   { label: 'Workshop', value: 'workshop' },
@@ -360,7 +360,7 @@
               <div class="series-select-row">
                 <USelect
                   v-model="selectedSeriesId"
-                  aria-label="Select Series"
+                  aria-label="Select series"
                   @update:model-value="onSeriesSelect"
                   :items="
                     availableSeries.map((series) => ({