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

webapp/vite.config.js

@@ -0,0 +1,23 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    host: '0.0.0.0',
+    port: 5173,
+    hmr: {
+      clientPort: 5173,
+      // overlay shows errors on DSI too
+      overlay: true
+    },
+    cors: true
+  },
+  preview: {
+    host: '0.0.0.0',
+    port: 4173
+  },
+  clearScreen: false,
+  // For file:// fallback if needed, built files use relative paths
+  base: './'
+})