Unit test config

.github/CODEOWNERS

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+# Code owners: these owners will be requested for review when someone opens a PR.
+# See https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/codeowners
+
+* @ManliestBen

.github/workflows/ci.yml

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+# Run build and tests on push and pull requests.
+# Branch protection can require this check before merging into dev or main.
+# Flow: feature branches → PR into dev → PR from dev into main (deploy).
+#
+# No secrets required: all HA and Google Calendar API calls are mocked in tests.
+# Tests never connect to your Home Assistant or Google—they cannot control real devices.
+
+name: CI
+
+on:
+  push:
+    branches: [dev, main, master]
+  pull_request:
+    branches: [dev, main, master]
+
+jobs:
+  build-and-test:
+    name: Build and test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: "npm"
+
+      - name: Install root dependencies
+        run: npm ci
+
+      - name: Install dashboard dependencies
+        run: npm run install:dashboard
+
+      - name: Build
+        run: npm run build
+
+      - name: Test
+        run: npm test