Bugfixes and improvements

To initiate a new Studio without installing the CLI globally:

npx create-sanity@latest

To upgrade a v3 Studio:

npm install sanity@latest

• Adds getClient() method to reference filter context

• Invalid references can now be removed from array inputs
• Validation error will now appear when missing a _ref in array of items
• Removes convert to reference button when converting array of references to singular reference
• patch.execute() now reflects that the second argument is optional