Sanity Studio v6.3.0: Portable Text Editor legacy cleanup, improved releases table display, and scrollable release descriptions

This release improves the Portable Text Input editor by cleaning up legacy attributes, fixes the releases table to better display long document type names, and makes the release dialog description field scrollable.

Studio PT drops legacy DOM attributes and classes

The Portable Text Input drops a set of legacy data-slate-* attributes, CSS classes, and non-pt data attributes from its editing DOM. The data-pt-* equivalents have shipped alongside them for some time, so consumers targeting any of these in custom CSS, DOM queries, or tests should migrate to the data-pt-* attributes.

🐛 Notable bugfixes and improvements

The document type column in the releases table now has a fixed width and truncates long type names with an ellipsis, showing the full name in a tooltip on hover.

The description field in the release dialog now scrolls when its content exceeds the maximum height.

MCP: Now uses oAuth for Codex CLI configuration.