fix: preserve empty comment initials

[jan-kubica]

Preserve an explicitly empty comment initials attribute across parse, serialize, and reparse. This keeps absent and authored-empty metadata distinct and adds a focused round-trip regression test.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4ffed02 and 40ffe22.

📒 Files selected for processing (3)

• .changeset/quiet-comments-remain.md
• packages/core/src/docx/serializer/commentSerializer.test.ts
• packages/core/src/docx/serializer/commentSerializer.ts

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• Create PR with unit tests
• Commit unit tests in branch fix/preserve-empty-comment-initials

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