Use only Chromium headless runtime for server browser checks

Dockerfile

@@ -5,10 +5,10 @@ RUN npm ci
 COPY . .
 RUN npm run build
 
-FROM mcr.microsoft.com/playwright:v1.58.2-noble AS browser-tests
+FROM node:22-bookworm-slim AS browser-tests
 WORKDIR /app
 COPY package*.json ./
-RUN npm ci
+RUN npm ci && npx playwright install --with-deps chromium --only-shell
 COPY tests ./tests
 COPY src/navigation.ts ./src/navigation.ts
 COPY playwright.config.ts ./