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>

scripts/dev-start.sh

@@ -48,8 +48,9 @@ echo "  5) Existing user (login screen — mock)"
 echo "  6) Boot mode (simulated 25s startup — mock)"
 echo "  7) Testnet stack (signet Bitcoin + LND + ThunderHub via Podman)"
 echo "  8) Manual instructions"
+echo "  9) Container orchestration dev (live testing on .228)"
 echo ""
-read -p "Enter choice [0-8]: " choice
+read -p "Enter choice [0-9]: " choice
 
 case $choice in
     0)
@@ -278,6 +279,13 @@ case $choice in
         echo ""
         echo "Access: http://localhost:8100  (password: password123)"
         ;;
+    9)
+        echo ""
+        echo "Container Orchestration Dev (live testing on .228)"
+        echo "Syncs code, builds on server, runs orchestration smoke tests."
+        echo ""
+        exec "$SCRIPT_DIR/dev-container-test.sh"
+        ;;
     *)
         echo "Invalid choice"
         exit 1