ci: align melonjs prepublishOnly hook with publish workflow (#1498)

#1497 swapped the publish workflow's build_cmd from `pnpm dist` to
`pnpm dist:publish` (drops the redundant `pnpm vitest run` — main.yml
gates tests now). But `npm publish` ALSO fires the package's own
`prepublishOnly` hook, which still hardcoded `pnpm dist`. So the
workflow built cleanly with the new recipe and then `npm publish`
re-triggered `pnpm dist` → `pnpm vitest run` → died on missing
Playwright browsers.

Point `prepublishOnly` at the same `dist:publish` script the workflow
uses. Keeps the safety net for local manual `npm publish` (build before
shipping) without dragging the broken vitest step back in.

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

chore(release): 19.6.0 — date + CHANGELOG polish (#1461)

Replace _unreleased_ with the release date and trim the verbose
post-merge CHANGELOG entries (Highlights and the Added / Changed /
Fixed bullets) down to one-sentence-each form. No behavior change.

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

chore(release): drop _unreleased_ from debug-plugin 16.0.0 heading (#…

…1459)

debug-plugin 16.0.0 ships alongside the 19.5.0 melonjs release.

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

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

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

Merge pull request #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 (#1386)

* Update packages/melonjs/CHANGELOG.md

Add missing release dates to changelog (#1359)

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

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

Chore: fix missing README on the npm release