Fix CI: run ui-test on ubuntu-latest instead of Playwright container

The Playwright container had slow I/O causing the webServer build to
exceed the 120s timeout. Running directly on ubuntu-latest with
explicit Playwright browser installation avoids container overhead
and enables pnpm caching.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: eakmanrq <6326532+eakmanrq@users.noreply.github.com>

Author: eakmanrq

.github/workflows/pr.yaml

@@ -219,18 +219,26 @@ jobs:
       needs.changes.outputs.client == 'true' || needs.changes.outputs.ci ==
       'true' || github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
-    container:
-      image: mcr.microsoft.com/playwright:v1.54.1-jammy
     steps:
       - uses: actions/checkout@v5
-      - name: Install pnpm via corepack
-        run: |
-          npm install --global corepack@latest
-          corepack enable
-          corepack prepare pnpm@latest-10 --activate
-          pnpm config set store-dir .pnpm-store
+      - uses: actions/setup-node@v6
+        with:
+          node-version: '20'
+      - uses: pnpm/action-setup@v4
+        with:
+          version: latest
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        run: echo "store=$(pnpm store path)" >> $GITHUB_OUTPUT
+      - uses: actions/cache@v4
+        with:
+          path: ${{ steps.pnpm-cache.outputs.store }}
+          key: pnpm-store-${{ hashFiles('pnpm-lock.yaml') }}
+          restore-keys: pnpm-store-
       - name: Install dependencies
         run: pnpm install
+      - name: Install Playwright browsers
+        run: pnpm --prefix web/client exec playwright install --with-deps
       - name: Run tests
         run: npm --prefix web/client run test