fix(line-break): make gdocs compatible line breaks

[palmer-cl]

• Make line breaks compatible in Google Docs
• Requires br tags within a ptag to be wrapped in a run tag

Before:

After:

[Copilot]

Pull Request Overview

This PR fixes line break compatibility with Google Docs by ensuring that br tags within paragraphs are properly wrapped in run (w:r) tags, which is required for proper rendering in Google Docs.

• Modifies the translateLineBreak function to wrap w:br elements in w:r (run) elements
• Adds comprehensive test coverage to verify the new structure

Reviewed Changes

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

File	Description
packages/super-editor/src/core/super-converter/exporter.js	Updates translateLineBreak function to wrap br elements in run tags
packages/super-editor/src/tests/export/lineBreakExporter.test.js	Adds new test file to verify line breaks are properly wrapped in run elements

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[harbournick]

LGTM