Feat: Add PR check workflow to build and test application

.github/workflows/pr-checks.yml

@@ -0,0 +1,36 @@
+name: PR Checks
+
+on:
+  pull_request:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-24.04 # Pin to LTS version (avoid latest to prevent unexpected issues)
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: yarn
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Build
+        run: npm run build
+
+  test:
+    name: Test
+    runs-on: ubuntu-24.04
+    needs: build
+
+    steps:
+      - name: Run unit tests
+        run: echo "Tests will run here"