fix: prevent duplicate compatibility text boxes

[jan-kubica]

Summary

• give modern DrawingML text boxes exclusive ownership of their VML compatibility fallback
• keep pure VML text boxes editable without also generating preview drawings
• preserve image-backed mixed VML text boxes as one conservative raw drawing

Validation

• focused parser and save/reopen ownership tests (28 passed)
• core suite and isolated timing-sensitive reruns
• lint, typecheck, and formatting
• build and clean-room distribution validation
• changeset check
• dependency audit

[jan-kubica]

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: 2a175264-b563-484f-a215-b87f27c67d71

📥 Commits

Reviewing files that changed from the base of the PR and between 7f5ab65 and 82a59be.

📒 Files selected for processing (5)

• .changeset/quiet-textboxes-rest.md
• packages/core/src/docx/paragraphTextBoxEnrichment.ts
• packages/core/src/docx/runParser.ts
• packages/core/src/docx/textBoxDrawingOwnership.test.ts
• packages/core/src/docx/vmlImageParser.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/stabilize-drawing-shape-roundtrip

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[coderabbitai]

@jan-kubica I’ll review the changes in #476, focusing on DrawingML/VML ownership and round-trip behaviour.

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