chore(release): prepare 3.7.2

[nk-o]

Patch rather than minor: nothing is added. Custom breakpoints are now applied to the shipped stylesheets instead of compiling styles on the site (#259), which removes the bundled CSS parser that collided with another plugin's copy and took a customer's site down on 3.7.0, and RTL sites get their right-to-left stylesheets again. The Pro half of the release carries the same core plus the updater fix from nk-crew/ghostkit-pro#60.

The version bump is what arms the cleanup migration keyed 3.7.2. Checked on this build's dev site: seeded with an old site's compiled files under uploads/ghostkit/gutenberg, the saved-hash option and the queue's cron event, one page load removed all three and recorded ghostkit_db_version 3.7.2.

Changelog entry, in both CHANGELOG.md and readme.txt:

= 3.7.2 - Sep 14, 2026 =

* fixed a critical error on sites where another plugin ships a different version of the same CSS parser, which showed up as "Declaration of Sabberworm\CSS\Value\Size::render() must be compatible" once the custom breakpoints styles were rebuilt
* changed custom breakpoints to be applied to the shipped stylesheets directly instead of compiling styles on the site, so the change takes effect on the next page load
* fixed RTL sites loading the left-to-right stylesheets for blocks, the editor and the settings pages
* **Pro:**
* fixed one failed plugin update on the Plugins screen leaving the remaining queued updates waiting for a page reload
* fixed RTL sites loading the left-to-right stylesheets of the Pro blocks on the frontend and in the editor

Translations are regenerated; the template picks up the new plugin description from the docs commits. Checks on this branch: npm run lint clean, npm run test:unit:php OK (67 tests, 127 assertions), npm run test:e2e 25 passed, npm run lint:php clean.

After the merge: tag v3.7.2 to deploy to wordpress.org, then bump core-plugin in Ghost Kit Pro and run its bump-from-core for the Pro 3.7.2 release.