Slimmer libraries + bugfixes and improvements

• We no longer publish ./src folders to npm for our libraries. This reduces the space we take in your node_modules folders, and speeds up install times for your package managers.
• There are now fewer steps to take when switching perspectives while creating a new document. If the document has not yet been created in the dataset, you may now start editing it straight away after switching perspectives. You no longer need to manually add the new document to the release.

• Fixes issue where the time of a datetime input with a timezone selected was not matching the right values when changing the day.
• Fixes a bug where Studio would briefly display the error message "Process is not defined" on launch in some scenarios (e.g., embedded Studio in React Router).

To initiate a new Sanity Studio project or upgrade an existing one, please refer to our comprehensive guide on Installing and Upgrading Sanity Studio.

If you are updating from a version earlier than 3.37.0, you should also check out this article to ensure your dependencies are up to date.