[6.x] Implement HTMLSanitizers as a Laravel Manager

[riasvdv]

Description

HTMLSanitizers was doing everything manually that Laravel's Manager support class provides.

This brings the service in line with Laravel conventions and how extend works.

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[Copilot]

Pull request overview

This PR refactors Craft’s HTML sanitizer registry to use Laravel’s Illuminate\Support\Manager, replacing the previous manual registration/resolution logic and aligning sanitizer extension with Laravel’s extend()/driver conventions.

Changes:

• Replaced the legacy HtmlSanitizers registry implementation with HtmlSanitizerManager (a Laravel Manager) and updated the HtmlSanitizers facade to resolve the manager.
• Updated core, adapter, and test code to use HtmlSanitizers::extend()/sanitize() and Manager semantics (driver caching, forgetDrivers(), etc.).
• Reworked/expanded unit coverage around Manager behavior and updated documentation accordingly.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
yii2-adapter/tests-laravel/HtmlPurifier/LegacyHtmlPurifierConfigRegistrarTest.php	Updates adapter test to use the new manager-based sanitizer service.
yii2-adapter/src/Yii2ServiceProvider.php	Uses $this->app->make() instead of the global app() helper for registrar boot.
yii2-adapter/src/HtmlPurifier/LegacyHtmlPurifierConfigRegistrar.php	Switches legacy HTMLPurifier config registration to extend() against the manager.
yii2-adapter/legacy/helpers/HtmlPurifier.php	Updates deprecated helper to route sanitization through the HtmlSanitizers facade.
tests/Unit/Twig/Extensions/HtmlTwigExtensionTest.php	Updates unit test to extend sanitizers via facade/Manager API.
tests/Unit/Support/HtmlSanitizer/HtmlSanitizersTest.php	Removes old registry tests that targeted the pre-Manager implementation.
tests/Unit/Support/HtmlSanitizer/HtmlSanitizerManagerTest.php	Adds new unit tests validating Manager behavior, caching, extension forms, and error cases.
tests/Unit/Field/Data/MarkdownDataTest.php	Updates test to use HtmlSanitizers::extend() for sanitizer setup.
tests/Feature/Http/Controllers/App/RenderControllerTest.php	Updates feature test sanitizer setup to use the facade extend().
tests/Feature/Field/MarkdownFieldTest.php	Updates sanitizer setup and strengthens assertions using DOM crawling.
tests/.pest/snapshots/Unit/Support/HtmlSanitizer/HtmlSanitizersTest/*	Removes snapshots tied to the deleted legacy registry tests.
src/Twig/Extensions/HtmlTwigExtension.php	Switches Twig sanitize filter implementation to use the facade.
src/Support/HtmlSanitizer/HtmlSanitizerManager.php	Implements the sanitizer registry as a Laravel Manager with supported definition forms.
src/Support/Facades/HtmlSanitizers.php	Updates facade accessor/signature docs to point at HtmlSanitizerManager.
src/Http/Controllers/App/RenderController.php	Updates request validation to pull sanitizer names from the facade/manager.
src/Field/Markdown.php	Updates sanitizer option generation to read names from the facade.
src/Field/Data/MarkdownData.php	Switches sanitization execution to the facade.
src/Config/ConfigServiceProvider.php	Changes sanitizer-definition loading to read from craft.sanitizers config key.
docs/html-sanitizers.md	Updates documentation to describe the Manager-based API and extension formats.
CHANGELOG.md	Notes introduction of HtmlSanitizerManager and plugin extension via HtmlSanitizers::extend().