Replace npm run with pnpm in CI workflow

[Copilot]

Addresses review feedback on #1164 — the CI workflow was using npm run to execute scripts after installing dependencies with pnpm, creating inconsistency.

Changes

• Replaced all npm run <script> with pnpm <script> in .github/workflows/ci_reusable.yaml:
  • prettier
  • tsc
  • lint
  • build (2 occurrences)

- - run: npm run prettier
- - run: npm run tsc
- - run: npm run lint
- - run: npm run build
+ - run: pnpm prettier
+ - run: pnpm tsc
+ - run: pnpm lint
+ - run: pnpm build

Note: npx commands for Playwright and Fleek CLI left unchanged as these invoke external CLIs, not project scripts.

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