Sanity Studio v5.25.1: Fixes `Unknown file extension ".css"` error

This release fixes CSS file handling errors and improves the Studio pane layout by truncating long document titles instead of allowing them to overflow.

🐛 Notable bugfixes and improvements

Fixes an issue that caused the Error: Unknown file extension ".css" error.

Long document titles in the Studio pane header now truncate with an ellipsis instead of overflowing into adjacent panes (e.g. when the Comments pane is open).

fix: show login screen instead of error when session expires