feat: onboarding polish, splash screen, controller nav, dev script

Onboarding flow:
- Intro: improved layout and transitions
- DID: better card styling and responsiveness
- Path: added visual enhancements
- Backup/Identity/Verify: streamlined markup
- SplashScreen component added

UI:
- Controller navigation improvements (useControllerNav)
- Style.css refinements

Backend:
- Runtime package fix

Dev:
- dev-start.sh improvements

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/OnboardingPath.vue

@@ -82,6 +82,7 @@
       <!-- Action Buttons -->
       <div class="flex justify-center max-w-[600px] mx-auto flex-shrink-0 px-3 sm:px-4 pb-4 sm:pb-6">
         <button
+          ref="continueButton"
           @click="proceed"
           class="path-action-button path-action-button--continue"
         >
@@ -93,9 +94,17 @@
 </template>
 
 <script setup lang="ts">
+import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 
 const router = useRouter()
+const continueButton = ref<HTMLButtonElement | null>(null)
+
+onMounted(() => {
+  setTimeout(() => {
+    continueButton.value?.focus({ preventScroll: true })
+  }, 400)
+})
 
 function proceed() {
   router.push('/onboarding/did').catch(() => {})