Add ForbiddenInheritanceRule

[Kocal]

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[Copilot]

Pull request overview

This PR adds a new PHPStan rule ForbiddenInheritanceRule that prevents the use of class inheritance in Symfony UX Twig Components, promoting composition via traits instead. This enforces a best practice that helps avoid tight coupling between components and improves code reusability.

Key Changes:

• Implements ForbiddenInheritanceRule that detects when a Twig component extends another class
• Adds comprehensive test coverage with fixtures for various scenarios (inheritance, traits, no parent)
• Updates README with documentation and examples showing forbidden vs. recommended patterns

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Rules/TwigComponent/ForbiddenInheritanceRule.php	Core rule implementation that checks for class inheritance in Twig components
tests/Rules/TwigComponent/ForbiddenInheritanceRule/ForbiddenInheritanceRuleTest.php	Test suite with violations and no-violations test methods
tests/Rules/TwigComponent/ForbiddenInheritanceRule/config/configured_rule.neon	PHPStan configuration file for the rule
tests/Rules/TwigComponent/ForbiddenInheritanceRule/Fixture/ComponentWithInheritance.php	Fixture demonstrating violation case
tests/Rules/TwigComponent/ForbiddenInheritanceRule/Fixture/ComponentWithoutInheritance.php	Fixture showing compliant component without inheritance
tests/Rules/TwigComponent/ForbiddenInheritanceRule/Fixture/ComponentUsingTrait.php	Fixture showing recommended trait-based composition
tests/Rules/TwigComponent/ForbiddenInheritanceRule/Fixture/NotAComponent.php	Fixture ensuring rule only applies to Twig components
README.md	Documentation with usage instructions and examples

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