feat: #3628605 Allow longer remote-video captions

Nick Hoperequested to merge
issue/glightbox_media_video-3628605:codex/3628605-long-captions into 1.0.x

Replaces custom caption and description textfields with textareas, removing the default 128-character limit. Stored settings remain strings.

Local browser checks on Drupal 11.4.8 confirm both inputs retain 740 characters.

An equivalent change is planned for GLightbox's image formatters.

Issue: https://www.drupal.org/project/glightbox_media_video/issues/3628605

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

Merge request reports