Update CHANGELOG for version 8.4.0

[justin808]

Summary

Pull Request checklist

• Add/update test to cover these changes
• Update documentation
• Update CHANGELOG file

Other Information

Summary by CodeRabbit

• New Features
  • Added support for Subresource Integrity (SRI).
• Bug Fixes
  • Addressed a dependency security issue by updating webpack-dev-server to secure versions (^4.15.2 or ^5.2.2).
• Documentation
  • Updated changelog with v8.4.0 (September 8, 2025), including Added and Fixed entries.
  • Refreshed comparison links: Unreleased now compares v8.4.0...main; added link for v8.4.0 (v8.3.0...v8.4.0).

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Adds a new v8.4.0 section to CHANGELOG.md with Added and Fixed entries, updates dependency version guidance for webpack-dev-server, adjusts Unreleased compare links, and appends the v8.4.0 compare link.

Changes

Cohort / File(s)	Summary
Changelog update CHANGELOG.md	Added v8.4.0 section (Added: subresource integrity; Fixed: dependency security via webpack-dev-server ^4.15.2 || ^5.2.2). Updated Unreleased compare link to v8.4.0…main and added compare link v8.3.0…v8.4.0.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested reviewers

• tomdracz
• Judahmeek

Poem

I twitch my whiskers—version hop!
v8.4.0 goes “plip-plop.”
Integrity snug, dev server tight,
Links aligned, the diff is light.
I thump, approve—secure and neat,
Carrot commits make changes sweet. 🥕✨

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ea16ce6 and 887e575.

📒 Files selected for processing (1)

• CHANGELOG.md (3 hunks)

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch justin808-patch-1

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