ci: add build workflow for client

- Implemented a GitHub Actions workflow for building the client application.
- Ensures that changes to the client are validated through automated builds.

.github/workflows/client-build.yaml

@@ -0,0 +1,35 @@
+name: Client - Build
+
+on:
+  pull_request:
+    branches:
+      - develop
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build Application
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+
+      - name: Install Dependencies
+        run: |
+          cd client
+          npm ci --cache .npm --prefer-offline
+
+      - name: Run Build
+        run: npm run build
+
+      - name: Upload Build Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: backend-app
+          path: app

.github/workflows/client-test.yaml

@@ -22,7 +22,7 @@ jobs:
       - name: Install dependencies
         run: |
           cd client
-          npm install
+          npm ci --cache .npm --prefer-offline
 
       - name: Run vitest
         run: |