[Maintenance] Bump plugin to Sylius 2.0

[Wojdylak]

Based on #76

[Copilot]

Pull Request Overview

This PR migrates the plugin from Sylius 1.x to Sylius 2.0, introducing LiveComponents architecture and updating dependency versions.

Key changes include:

• Upgraded PHP requirement from 8.0 to 8.2 and Symfony from 5.4+ to 6.4+/7.3+
• Replaced custom JavaScript with Symfony UX LiveComponent for form handling
• Introduced factory and processor patterns for subscription creation
• Migrated from SyliusUi events to Twig Hooks for template rendering

Reviewed Changes

Copilot reviewed 148 out of 171 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
composer.json	Updated PHP, Symfony, and Sylius version constraints; removed psalm dependency
config/services.yaml	Updated service definitions to remove deprecated availability checker references and add new processor/component services
src/Twig/Component/AddNotificationComponent.php	New LiveComponent replacing JavaScript-based form handling
src/Factory/SubscriptionFactory.php	New factory implementing subscription creation logic extracted from controller
src/Processor/SubscriptionProcessor.php	New processor centralizing subscription business logic
src/Controller/SubscriptionController.php	Simplified by removing subscription creation logic moved to processor
templates/shop/product/show/content/info/summary/add_notification.html.twig	New template using LiveComponent architecture
config/twig_hooks/**	New Twig Hooks configuration replacing deprecated SyliusUi events
tests/Application/**	Removed old test application files in favor of sylius/test-application package
behat.yml.dist	Updated paths to use sylius/test-application

Comments suppressed due to low confidence (1)

src/Twig/Component/AddNotificationComponent.php:1

• Extra space and asterisk in PHPDoc comment. Should be /** @var ProductVariantInterface|null $variant */

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