chore: #3628807 Fix coding standards, lint errors and spelling

Nick Hoperequested to merge
issue/glightbox_media_video-3628807:codex/3628807-code-cleanup into 1.0.x

Fix existing PHP coding-standard violations, JavaScript and CSS lint errors, and spelling findings. Add a project dictionary for valid terms. Formatter behavior and settings remain unchanged.

Validation:

  • PHP syntax, ESLint, Stylelint and CSpell pass.
  • Executable PHP tokens, JavaScript behavior and CSS declarations remain equivalent.
  • Compatible with pending MRs !8 (merged), !9 (merged) and !10 in either application order.
  • Drupal PHPCS passes with !8 (merged) applied. Its two array-key fixes are kept in that MR to avoid conflicts.

Service-injection recommendations and non-blocking JavaScript warnings are outside this MR.

Issue: https://www.drupal.org/project/glightbox_media_video/issues/3628807

AI-Generated: Yes (Codex prepared the changes and verification).

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