chore: replace yarn with pnpm

[JustMell0]

Migrate from yarn v1 to pnpm

• Replace yarn with pnpm in all CI workflows (pr-check, build-next, release)
• Use pnpm/action-setup with actions/setup-node cache integration
• Add packageManager field to package.json
• Replace yarn.lock with pnpm-lock.yaml

Closes #399

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 040dc64b-c7bd-4c99-a8f1-b2e689bf9e39

📥 Commits

Reviewing files that changed from the base of the PR and between db2a3ee and 05c7d24.

⛔ Files ignored due to path filters (2)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml
• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (4)

• .github/workflows/build-next.yaml
• .github/workflows/pr-check.yaml
• .github/workflows/release.yaml
• package.json

📝 Walkthrough

Walkthrough

The PR migrates CI/CD pipelines and package manager configuration from Yarn v1 to pnpm. Three GitHub Actions workflows are updated to install and use pnpm via pnpm/action-setup, configure Node caching for pnpm, and run pnpm commands. The package.json declares pnpm@10.28.0 as the required package manager.

Changes

Package Manager Migration to pnpm

Layer / File(s)	Summary
Package Manager Declaration package.json	Adds packageManager field specifying pnpm@10.28.0 with integrity hash.
CI Workflow Updates .github/workflows/build-next.yaml, .github/workflows/pr-check.yaml, .github/workflows/release.yaml	All three workflows replace Yarn-based steps with pnpm: remove Yarn cache discovery and caching logic, add pnpm/action-setup, configure Node caching for pnpm, and replace npx yarn commands with pnpm equivalents.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: replace yarn with pnpm' accurately and concisely summarizes the main change of migrating from yarn to pnpm across CI workflows and package configuration.
Description check	✅ Passed	The description provides relevant details about the changeset, including the migration from yarn to pnpm, updates to CI workflows, and configuration changes to package.json.
Linked Issues check	✅ Passed	The pull request successfully addresses issue #399 by migrating the repository from Yarn v1 to pnpm, including CI workflow updates and package.json configuration.
Out of Scope Changes check	✅ Passed	All changes are directly related to the pnpm migration objective. Updates to CI workflows and package.json configuration are within scope for the stated goal.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[jeffmaury]

Needs more love as build is failing

[JustMell0]

Needs more love as build is failing

The build says:

/home/runner/work/extension-layers-explorer/extension-layers-explorer/src/explorer.spec.ts
Error:   177:15  error  'toThrowError' is deprecated  sonarjs/deprecation

which is out of scope of this PR. I could open a new one to fix this issue :)