chore(release): set 19.4.0 release date (melonjs#1449)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Merge pull request melonjs#1427 from melonjs/chore/release-19.2.0

chore(release): stamp 19.2.0 release date

Release v19.1.0

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Release v19.0.0 (melonjs#1386)

* Update packages/melonjs/CHANGELOG.md

Add missing release dates to changelog (melonjs#1359)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Merge pull request melonjs#1337 from melonjs/chore/fix-npm-readme

Chore: fix missing README on the npm release

Merge pull request melonjs#1335 from melonjs/fix/loading-screen-race

Fix loading screen logo persisting after preload completes

Merge pull request melonjs#1333 from melonjs/chore/add-spine-plugin

Spine plugin: custom SpineBatcher, CI fix, and README updates

Merge pull request melonjs#1306 from melonjs/chore/release-18.1.0

Release 18.1.0