Add settings for trimming whitespace and final newline

[fadrian06]

This pull request makes a minor update to the .editorconfig file to enforce consistent whitespace handling across the project.

• Editor configuration improvements:
  • Added trim_trailing_whitespace = true and insert_final_newline = true to ensure files do not have trailing whitespace and always end with a newline.

[Copilot]

Pull request overview

This PR updates the repository’s .editorconfig to enforce consistent whitespace hygiene across the project, helping keep diffs clean and reducing formatting noise between contributors’ editors.

Changes:

• Enable trimming of trailing whitespace for files covered by the global [*] section.
• Require a final newline for files covered by the global [*] section (while preserving the existing exception for tests/views/*.php).