Implement bundle size CI check

[AbanoubGhadban]

Overview

Add CI check that monitors bundle sizes of the npm packages and fails if they have a significant increase in size compared to the base branch.

Implementation

Implemented in PR #2149 with the following features:

CI Workflow (.github/workflows/bundle-size.yml)

• Triggers on PRs that modify packages/**, package.json, pnpm-lock.yaml, or .size-limit.json
• Compares PR bundle sizes against the base branch
• Fails if any package increases by more than 0.5KB (configurable threshold)
• Posts a size report comment on the PR via size-limit-action

What Gets Measured

• react-on-rails: Raw, gzip, and brotli compressed sizes
• react-on-rails-pro: Raw, gzip, and brotli compressed sizes
• react-on-rails-pro-node-renderer: Raw, gzip, and brotli compressed sizes
• Webpack bundled imports: Client-side bundle sizes when importing packages via webpack

Local Tools

• pnpm run size - Check current bundle sizes
• bin/compare-bundle-sizes - Compare your branch against master locally
• bin/skip-bundle-size-check - Bypass the CI check for intentional size increases

Configuration Files

• .size-limit.json - size-limit configuration defining what to measure
• .bundle-size-skip-branch - Contains branch name to skip the size check
• scripts/bundle-size.mjs - Utility script for setting dynamic limits and comparing sizes

Documentation

• Added "Bundle Size Checks" section to CONTRIBUTING.md
• Added CHANGELOG entry

Related PRs

• Add bundle size CI check using size-limit #2149 - Main implementation
• Add size-limit packages for bundle size tracking #2150 - Added size-limit packages to master
• Add size-limit configuration for bundle size tracking #2152 - Added .size-limit.json config to master

[AbanoubGhadban]

Implemented