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/OnboardingIntro.vue

@@ -18,6 +18,7 @@
         </p>
 
         <button
+          ref="ctaButton"
           @click="goToOptions"
           class="glass-button px-6 py-3 sm:px-8 sm:py-4 rounded-lg text-base sm:text-lg font-medium transition-all hover:bg-black/70 hover:border-white/30 onb-cta"
         >
@@ -65,12 +66,20 @@
 </template>
 
 <script setup lang="ts">
-import { ref } from 'vue'
+import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import AnimatedLogo from '@/components/AnimatedLogo.vue'
 import { rpcClient } from '@/api/rpc-client'
 
 const router = useRouter()
+const ctaButton = ref<HTMLButtonElement | null>(null)
+
+onMounted(() => {
+  // Auto-focus after entry animation completes (1.4s animation delay + 0.6s duration)
+  setTimeout(() => {
+    ctaButton.value?.focus({ preventScroll: true })
+  }, 2100)
+})
 
 function goToOptions() {
   router.push('/onboarding/path').catch(() => {})