Simplify EventDispatcher methods and remove redundant descriptions

[fadrian06]

This pull request refactors the EventDispatcher class to simplify and modernize its implementation, primarily by removing redundant comments, improving type annotations, and streamlining logic for managing event listeners.

Code cleanup and modernization:

• Removed redundant PHPDoc comments and simplified type annotations for properties and methods, making the codebase cleaner and easier to maintain.
• Updated array type hints (e.g., replaced array<int, callable> with callable[]) and used the null coalescing assignment operator (??=) for initializing event listener arrays.

Logic improvements:

• Refactored the trigger method to use direct variadic calls and early exit on false return, improving readability and performance.
• Improved the hasListeners method to include an explicit array check and count, ensuring more robust listener detection.
• Simplified listener removal logic in removeListener by using array_filter with a static closure and early return if no listeners exist.

[Copilot]

Pull request overview

This PR refactors flight\core\EventDispatcher to reduce redundant PHPDoc, modernize type annotations, and simplify listener management and dispatch logic.

Changes:

• Simplified listener registration and cleanup logic (??=, array_filter + array_values, unconditional unset).
• Updated PHPDoc array type annotations to short-form (callable[], string[]) and trimmed redundant method descriptions.
• Refactored trigger() loop to a more direct invocation style with early-exit on false.

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