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/OnboardingBackup.vue

@@ -74,13 +74,7 @@
       </div>
 
       <!-- Action Buttons -->
-      <div class="flex gap-3 sm:gap-4 max-w-[600px] mx-auto flex-shrink-0 px-3 sm:px-4 pb-4 sm:pb-6">
-        <button
-          @click="skipForNow"
-          class="path-action-button path-action-button--skip"
-        >
-          Skip
-        </button>
+      <div class="flex justify-center max-w-[600px] mx-auto flex-shrink-0 px-3 sm:px-4 pb-4 sm:pb-6">
         <button
           @click="proceed"
           :disabled="!downloaded"
@@ -149,8 +143,5 @@ function proceed() {
   router.push('/onboarding/verify').catch(() => {})
 }
 
-function skipForNow() {
-  router.push('/onboarding/verify').catch(() => {})
-}
 </script>