docs: Document GrapesJS Builder asset build workflow

[promptless-for-oss]

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Documents that the GrapesJS Builder's compiled JS/CSS are no longer committed to git (mautic/mautic#16435). Adds a "Building the Builder assets" section to docs/themes/grapesjs.rst covering the gitignored dist/ directory, automatic builds on composer install/update and during initial DDEV provisioning (non-fatal when Node is missing), manual composer gjs-build / ddev gjs-build commands, the Node 24 build version, and how Parcel content-hashing plus manifest.json feed the runtime AssetsSubscriber.

@patrykgruszka review (applied)

• Version scope: changed "From Mautic 7" to "From Mautic 7.2" — the untracked-assets build workflow ships only in 7.2, not 7.0/7.1 (confirmed against source PR #16435: base 7.x / milestone 7.2.0 / release_metadata 7.2.0-rc; the gjs-build command and dist .gitignore line are absent on 7.0.2 and 7.1.3). Applied verbatim.
• DDEV trigger: corrected the bullet that claimed the build runs on every DDEV start. It now states the build runs when DDEV provisions the environment for the first time (not on every start), and directs existing environments to run ddev gjs-build. Applied with a minor wording refinement for parallel list structure and concision; the substance the reviewer requested is unchanged.

Trigger Events

• mautic/mautic PR #16435: Stop tracking GrapesJS dist assets in git & Parcel update

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[adiati98]

@promptless-for-oss please address the suggestions.

[promptless-for-oss]

Thanks for the review, @adiati98 — I've pushed updates addressing all the comments:

• Feature-name capitalization — Applied the Mautic.FeatureList fixes where the word refers to the Mautic feature. Where assets refers to the built JS/CSS build artifacts (not the Mautic Asset feature), I kept the artifact meaning and cleared Vale accordingly so the text stays accurate.
• Suggested text — Applied all three of your suggested-text replacements (Node 24 / automatic-build paragraph, the Parcel + manifest.json / AssetsSubscriber paragraph, and the git-checkout paragraph).
• Active voice — Fixed the aren't committed passive usage and changed like → such as.

Vale now reports no findings for this content. Ready for another look.

[promptless-for-oss]

Thanks @patrykgruszka — on it. We will scope the section to 'From Mautic 7.2.' and clarify that the build runs during the initial DDEV-managed setup (not on every start), directing existing environments to ddev gjs-build when needed. We will push an update to this PR shortly.

[patrykgruszka]

Good to go 👍

[adiati98]

Thanks for the review, @patrykgruszka! 🚀