feat: finish portfolio title, navigation, and destination effects

Add the approved name animation, rounded docking navigation, localized keyboard focus cue, unified builds card, and destination copy hierarchy.

Introduce lightweight one-shot meteors and a sun ring that repeats every three seconds at Contact. Open the email action in a separate browsing context. Preserve reduced-motion behavior and keep private handoff and visual-check artifacts out of version control.

Validation: 649 tests passed; all 20 failures in world-models and SceneCanvas reproduce on baseline 103427f. Typecheck, artifact verification, and transfer budgets passed. Client/SSR preview build passed before this commit. Existing baseline test failures remain unchanged.

src/components/PortfolioSection.vue

@@ -11,8 +11,15 @@ defineProps<{
 
 <template>
   <section :id="id" class="portfolio-section" :aria-labelledby="`${id}-heading`" :data-layout="layout">
-    <p v-if="eyebrow" class="section-eyebrow">{{ eyebrow }}</p>
-    <h2 :id="`${id}-heading`" tabindex="-1">{{ heading }}</h2>
+    <div v-if="$slots.lead" class="project-stage__lead">
+      <p v-if="eyebrow" class="section-eyebrow">{{ eyebrow }}</p>
+      <h2 :id="`${id}-heading`" tabindex="-1">{{ heading }}</h2>
+      <slot name="lead" />
+    </div>
+    <template v-else>
+      <p v-if="eyebrow" class="section-eyebrow">{{ eyebrow }}</p>
+      <h2 :id="`${id}-heading`" tabindex="-1">{{ heading }}</h2>
+    </template>
     <slot />
   </section>
 </template>