ci: install Playwright Chromium before running tests

vue/primitives runs vitest in browser mode (instances: chromium), so 'pnpm test' launches Playwright Chromium — which the CI runner doesn't have, failing the run after all 3320 tests pass. Add 'playwright install --with-deps chromium' before the test step in both CI and publish workflows.

.github/workflows/publish.yaml

@@ -18,7 +18,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install pnpm
-        uses: pnpm/action-setup@v5
+        uses: pnpm/action-setup@v6
         with:
           run_install: false
 
@@ -31,6 +31,9 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
+      - name: Install Playwright browser
+        run: pnpm exec playwright install --with-deps chromium
+
       - name: Build & Test
         run: pnpm build && pnpm test