Initial commit: KiddOs v3 React kiosk

- React 18 + Vite 5 hot-reload OS (800x480 Nord theme)
- 7 apps: Journal, Calculator, Drawing, CodeLab, Clock, Files, Scratch
- Cage + Cog Wayland kiosk, offline localStorage
- Scripts: dev.sh, run-kiosk.sh, run-prod.sh

scripts/run-prod.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Dev helper: run both vite + quick test
+set -e
+cd "$(dirname "$0")/../webapp"
+echo "Checking vite build..."
+npm run build
+echo "Build ok -> dist/"
+echo ""
+echo "Preview static build on http://localhost:4173 to test without HMR"
+npm run preview -- --host 0.0.0.0 --port 4173 &
+PREVIEW_PID=$!
+echo "Preview PID $PREVIEW_PID"
+sleep 2
+echo ""
+echo "Try kiosk with prod file:"
+echo "cage -s -- cog --platform=wl file://$PWD/dist/index.html --bg-color=#2E3440"
+echo ""
+echo "Press Ctrl+C to stop preview"
+wait $PREVIEW_PID