fix: set DocumentSettings on Shared folder for UI visibility

[Endiruslan]

Summary

• The _ensure_document_exists function creates the root "Shared" folder with show_in_global_context=True passed to Document.create_document(), but the SDK does not emit the DocumentSettings aspect from this parameter
• This causes the Shared folder to have showInGlobalContext=None, making it and all child documents invisible in the DataHub UI Documents page
• Applied the same DocumentSettingsClass workaround already used for individual documents (lines 593-605) to the folder creation path

How to reproduce

1. Configure MCP server with TOOLS_IS_MUTATION_ENABLED=true
2. Use save_document tool to create any document
3. Open DataHub UI → Documents page
4. The "Shared" folder is not visible; documents inside are only findable via search

Verified via GraphQL introspection — the folder had showInGlobalContext: null while documents inside had showInGlobalContext: true. After manually setting the aspect via REST API, the folder appeared in the UI.

Test plan

• Create a fresh DataHub instance with Context Documents enabled
• Use save_document MCP tool to create a document
• Verify the "Shared" folder appears in the DataHub UI Documents page
• Verify documents inside the folder are visible and navigable

🤖 Generated with Claude Code

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Note

Low Risk
Small, localized change to document-folder creation that only adds an extra aspect during upsert; low risk aside from potential SDK/aspect compatibility issues.

Overview
Ensures the root/shared folder created by save_document persists UI visibility by explicitly attaching the DocumentSettings aspect (showInGlobalContext=true) during _ensure_document_exists, matching the existing workaround already applied to individual document creation.

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