Sanity Studio v6.9.0: Improve structure tool stability, CLI behavior, and TypeScript schema typings

This release fixes a crash in the structure tool's incoming references inspector, and enhances TypeScript schema helpers to better preserve optional properties.

🐛 Notable bugfixes and improvements

Fixed a crash that could take down the whole structure tool when the Incoming references inspector was open. Inspector panels now show a recoverable error inside the panel instead of unmounting the tool, and the incoming references list links to the referencing document when the exact field path cannot be determined.

CLI deploy: build and deploy now keeps a studio’s installed package versions rather than silently ignoring deployment.autoUpdates, reports the existing app id when its slug is already taken, and applies the app's visibility.

CLI: Show table output when commands are run programmatically. Commands that render tables, such as sanity users list, produced no output when invoked programmatically instead of from a terminal. sanity users list now also reports when a project has no members rather than printing an empty table.

CLI init: Use @​sanity/icons v5 de-barrelled imports in templates.

TypeScript: Schema define helpers now preserve explicitly supplied optional properties on their return types. For example, a preview, options, validation, or components property declared inline through defineType, defineField, or defineArrayMember can be read from the returned value without unnecessary non-null assertions.