Add React renderer

.github/workflows/react_renderer.yml

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+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: React renderer
+
+on:
+  push:
+    branches: [ main ]
+    paths-ignore:
+      - 'renderers/angular/**'
+      - 'renderers/flutter/**'
+      - 'renderers/lit/**'
+      - 'samples/agent/adk/**'
+  pull_request:
+    paths-ignore:
+      - 'renderers/angular/**'
+      - 'renderers/flutter/**'
+      - 'renderers/lit/**'
+      - 'samples/agent/adk/**'
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install top-level deps
+        working-directory: ./renderers/react
+        run: npm ci
+
+      - name: Build React renderer
+        working-directory: ./renderers/react
+        run: npm run build
+
+      - name: Test React renderer
+        working-directory: ./renderers/react
+        run: npm test
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install top-level deps
+        working-directory: ./renderers/react
+        run: npm ci
+
+      - name: Build React renderer and its dependencies
+        working-directory: ./renderers/react
+        run: npm run lint
+

renderers/react/.prettierrc

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+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "es5",
+  "printWidth": 100,
+  "bracketSpacing": false,
+  "jsxSingleQuote": false
+}