astro 5.9.1

#13899 7a1303d Thanks @reknih! - Fix bug where error pages would return invalid bodies if the upstream response was compressed
#13902 051bc30 Thanks @arHSM! - Fixes a bug where vite virtual module ids were incorrectly added in the dev server
#13905 81f71ca Thanks @jsparkdev! - Fixes wrong contents in CSP meta tag.
#13907 8246bcc Thanks @martrapp! - Fixes a bug that caused view transition names to be lost.
#13901 37fa0a2 Thanks @ansg191! - fix fallback not being removed when server island is rendered