Bump to 4.19.1 and prepare for release

[William Wong (compulim)]

Changelog Entry

Description

Bump to 4.19.1 and prepare to release.

Design

Specific Changes

• npm version 4.19.1 (from 4.19.1-0)
• Update CHANGELOG.md

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)

[Copilot]

Pull request overview

This PR prepares the repo for the 4.19.1 release by promoting the root package version from the pre-release 4.19.1-0 to the stable 4.19.1, and updating the changelog/release compare links accordingly.

Changes:

• Update root package.json version to 4.19.1.
• Update package-lock.json root/package entry versions to 4.19.1.
• Add 4.19.1 section to CHANGELOG.md and update compare link references.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Promotes the root package from 4.19.1-0 to 4.19.1.
package-lock.json	Keeps lockfile root/package version metadata aligned with 4.19.1.
CHANGELOG.md	Adds the 4.19.1 release header and updates compare links (Unreleased and new 4.19.1).

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