fix(ci): use pnpx with pinned playwright version for browser install

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: logaretm

.github/actions/setup/action.yml

@@ -16,6 +16,3 @@ runs:
           packages/*/node_modules
           packages/*/dist
         key: build-${{ github.sha }}
-    - name: Install dependencies
-      run: pnpm install
-      shell: bash

.github/workflows/ci.yml

@@ -64,5 +64,5 @@ jobs:
           key: playwright-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
       - name: Install Playwright browsers
         if: steps.playwright-cache.outputs.cache-hit != 'true'
-        run: pnpm exec playwright install chromium
+        run: pnpx playwright@1.57.0 install chromium
       - run: pnpm test:ci