test: lock semantic and no-script portfolio behavior

src/components/PortfolioSection.vue

@@ -10,7 +10,7 @@ defineProps<{
 <template>
   <section :id="id" class="portfolio-section" :aria-labelledby="`${id}-heading`" :data-section-index="index">
     <p class="route-label">{{ String(index).padStart(2, '0') }} / {{ eyebrow }}</p>
-    <h2 :id="`${id}-heading`">{{ heading }}</h2>
+    <h2 :id="`${id}-heading`" tabindex="-1">{{ heading }}</h2>
     <slot />
   </section>
 </template>