Fix Tiptap collaboration cursor rendering after v3 upgrade

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Description of the Change

Tiptap v3 upgrade (Oct 2025) renamed @tiptap/extension-collaboration-cursor → @tiptap/extension-collaboration-caret and changed rendered CSS classes from collaboration-cursor__* to collaboration-carets__* (plural). CSS selectors were not updated, breaking cursor label positioning.

Changes:

• Fixed import typo: CollaborationCarent → CollaborationCaret in rich_text_editor/index.tsx
• Updated CSS selectors: .collaboration-cursor__* → .collaboration-carets__* in editor.scss
• Regenerated package-lock.json via npm install (520 packages locked)

Before:

<span class="collaboration-carets__caret">
  <div style="background-color: #aaff80">admin</div>
</span>

CSS selector .collaboration-cursor__label never matched → username rendered inline.

After:
CSS selector .collaboration-carets__label matches → position: absolute; top: -1.4em applies correctly.

Release Notes

Fixed collaboration cursor labels appearing inline in document text instead of positioned above cursors.

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Pull request overview

Fixes Tiptap v3 collaboration caret/cursor label rendering by aligning code and styles with the renamed extension and updated CSS classnames.

Changes:

• Renamed the Tiptap extension import/usage to CollaborationCaret
• Updated SCSS selectors from collaboration-cursor__* to collaboration-carets__*

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
javascript/src/frontend/collab_forms/rich_text_editor/index.tsx	Updates the collaboration caret extension import and configuration usage to match Tiptap v3 naming.
javascript/src/frontend/collab_forms/editor.scss	Updates caret/label selectors to match the new DOM classnames emitted by Tiptap v3.

Files not reviewed (1)

• javascript/package-lock.json: Language not supported

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The PR description/template states this PR must only contribute documentation, but the diff includes TypeScript/SCSS code changes. Please switch to the appropriate pull request template (or update the PR description to the correct template) so reviewers/maintainers can process it under the right contribution requirements.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.37%. Comparing base (3d6ea4c) to head (79dc9f0).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #817   +/-   ##
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  Coverage   91.37%   91.37%           
=======================================
  Files         368      368           
  Lines       20933    20933           
=======================================
  Hits        19127    19127           
  Misses       1806     1806           

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