Add cookie-banner React example app

Interactive playground with themed banner, headless components,
and debug tabs demonstrating programmatic consent access via
getConsent() across separate bundles.

Signed-off-by: Émile Ré <emile@probo.com>

examples/cookie-banner-react/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "@probo/example-cookie-banner-react",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build"
+  },
+  "dependencies": {
+    "@probo/cookie-banner": "*",
+    "react": "^19.2.1",
+    "react-dom": "^19.2.1"
+  },
+  "devDependencies": {
+    "@types/react": "^19.2.1",
+    "@types/react-dom": "^19.2.1",
+    "@vitejs/plugin-react": "^4.5.2",
+    "typescript": "~5.8.3",
+    "vite": "^6.3.5"
+  }
+}