MCP server v2.26.4: Fixes for schema deploys and document patching

Fixes

deploy_schema tool: Fixed deploys failing on every follow-up deploy to a workspace whose schema contains a portable-text block field (Found unknown properties for decorator strong: "i18nTitleKey") — the schema validator now matches the @sanity/schema v6 descriptor writer.

patch_documents tool: Fixed rejection of valid ifRevisionId values when patching published documents.

patch_documents tool: Fixed reporting success while silently ignoring patches written in unsupported formats — these are now rejected with guidance on the correct format.