fix: improve preview server startup detection in lighthouse CI [CAR-937]

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.gitea/workflows/ci.yml

@@ -88,8 +88,16 @@ jobs:
       - name: Start preview server
         run: |
           npm run preview -- --port 4173 &
-          sleep 10
-          npx wait-on http://localhost:4173/ --timeout 60000
+          for i in $(seq 1 30); do
+            if curl -s http://localhost:4173/ > /dev/null 2>&1; then
+              echo "Server ready on http://localhost:4173/"
+              exit 0
+            fi
+            echo "Waiting for server... ($i/30)"
+            sleep 2
+          done
+          echo "Server failed to start"
+          exit 1
       - name: Run Lighthouse CI
         run: |
           CHROME_PATH=$(find /home/runner/.cache/ms-playwright -name chrome -type f 2>/dev/null | head -1)