Vanilla js conversion

[trubach]

📝 Description

Fixes #1317

Converted all theme JavaScript to vanilla JS using Drupal.behaviors + once(), and removed jQuery as a dependency.

Converted (14 files -> Drupal.behaviors.<name> + once(id, selector, context), vanilla DOM)

• Simple attr/class: paragraph-icon-row, -feature-group, -rt, -content-slider, -card, -image-gallery, -calendar, -list-content, -cta-narrow, -vertical-tab (removeAttr/attr/removeClass -> removeAttribute/setAttribute/classList).
• With logic: paragraph-bb (matchMedia padding + resize bound once), paragraph-contact (captures [reverse] els, toggles on resize), paragraph-whitespace (sibling traversal via nextElementSibling/classList), google-cse (script injection guarded by once, reads drupalSettings).
• table-mobile.js was already converted on the base branch.

illinois_framework_theme.libraries.yml

• Removed all core/jquery dependencies (6 libraries).
• Added explicit core/drupal + core/once to every library running a converted behavior.
• Kept core/drupalSettings for google-cse and skipto-campus.

Verification

• node --check passes on all 15 JS files.
• libraries.yml validates as YAML.
• Theme-wide sweep confirms zero remaining jQuery / $( / core/jquery.

Notes

• paragraph-whitespace.js is an orphan (not referenced in libraries.yml); converted for completeness but not wired up - a pre-existing condition.
• External libs (Toolkit web-components, SkipTo, ils-*) are vanilla and don't require jQuery.
• Changes take effect after drush cr.

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✅ Peer Review Checklist

Reviewers: Please verify the following before approving.

• The pull request links to the issue it is addressing in the comment and in the "Development" section of the PR
• There is a short summary that describes how the fix is implemented
• Verifying work: Verify that the changes made are addressing the linked issue
• Accessibility: Changes that might impact accessibility are reviewed to work with keyboard navigation and screen readers
• Responsive: Layout is tested on desktop, tablet, and mobile screens
• Config changes: Any configuration updates are tested and verified using the Distribution Update import
• Security: Output is sanitized (using t(), Twig auto-escaping, etc.). No secrects included (API keys, etc.)
• Cleanliness: All debug code (ksm(), dpm(), console.log) has been removed.
• Comments: Complex logic is explained inline.
• Documentation: Any relevant documentation has been updated (this can be a separate issue if needed)

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