feat: add caching for Playwright dependencies in CI workflow

.github/workflows/ci.yml

@@ -115,10 +115,20 @@ jobs:
 
       - uses: oven-sh/setup-bun@v2
 
+
+      - name: Cache Playwright
+        id: playwright-cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/ms-playwright
+          key: ${{ runner.os }}-playwright-${{ hashFiles('frontend/bun.lock') }}
+
       - name: Install Dependencies
         run: |
-          (cd frontend && bun install) &
-          (cd frontend && bun x playwright install --with-deps)
+          (cd frontend && bun install)
+          if [ "${{ steps.playwright-cache.outputs.cache-hit }}" != "true" ]; then
+            (cd frontend && bun x playwright install --with-deps)
+          fi
 
       - name: Run E2E
         run: |