Add PR checks workflow and update deployment trigger

[Copilot]

Adds automated validation for pull requests using pnpm build and pnpm lint, and updates the deployment workflow to only run on pushes to main.

Changes

• New workflow .github/workflows/pr-checks.yml triggered on PRs to main
  • Setup: Node.js 20, pnpm with dependency caching
  • Checks: Runs pnpm build followed by pnpm lint
  • Permissions: Minimal contents: read for GITHUB_TOKEN
• Modified workflow .github/workflows/deploy.yml
  • Removed pull_request trigger
  • Now only deploys to GitHub Pages on push to main

This ensures pull requests are validated without triggering unnecessary deployment workflows. The deployment workflow follows the same setup pattern for consistency.

Original prompt

Add a github action for pull request to do checking with commands pnpm build and pnpm lint

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[foreleven]

@copilot Disable the Git Page action on "pull request"

[Copilot]

@copilot Disable the Git Page action on "pull request"

Done. The GitHub Pages deployment workflow now only triggers on push to main. Pull requests will use the new pr-checks workflow instead. (commit 1d6c895)