Align Playwright workflow with Node 20 and pnpm standard

[Copilot]

Summary

• What: Standardize Playwright E2E workflow on Node 20 and pnpm exclusively.
• Why: Eliminate package manager mixing (npm/pnpm) that causes inconsistent dependency graphs and longer CI times. Align with repository-wide Node 20 standard.

Changes

• Node.js: 18 → 20
• Package manager: Replace all npm ci / npm install with pnpm install
• pnpm setup: Use pnpm/action-setup@v3 (matches ci.yml pattern) instead of manual corepack
• Caching: Add cache: pnpm to actions/setup-node step
• Auth security: Improve .npmrc configuration with proper env vars and restrictive permissions (umask 077)
• Cleanup: Remove duplicate pnpm installation steps

Before/After

Before:

- name: Setup Node.js
  uses: actions/setup-node@v4
  with:
    node-version: "18"

- name: Install dependencies
  run: npm ci

# ... later in workflow ...
- name: Ensure pnpm available (corepack fallback)
  run: corepack enable && corepack prepare pnpm@9.15.9 --activate

- name: Install JS dependencies with pnpm
  run: pnpm install --frozen-lockfile

After:

- name: Setup pnpm
  uses: pnpm/action-setup@v3
  with:
    version: 9

- name: Setup Node.js
  uses: actions/setup-node@v4
  with:
    node-version: "20"
    cache: pnpm

- name: Install dependencies
  run: pnpm install --frozen-lockfile || pnpm install --no-frozen-lockfile || pnpm install

Testing

• YAML syntax validated
• CodeQL security scan: 0 alerts

Checklist

• Node version updated to 20
• Single package manager (pnpm) used throughout
• pnpm/action-setup@v3 configured
• Caching enabled
• Security improvements applied
• No security alerts

Reviewers

• @73junito

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[73junito]

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