astro@6.3.7

#16821 9c76b12 Thanks @astrobot-houston! - Fixes request body handling in the Node adapter when req.body is a Buffer, Uint8Array, or ArrayBuffer. Previously, binary body data was incorrectly JSON-stringified (producing {"type":"Buffer","data":[...]}) instead of being passed through directly. This affected libraries like serverless-http that set req.body to a Buffer.
#16785 de96360 Thanks @astrobot-houston! - Fixes vite.build.minify, vite.build.sourcemap, and vite.build.rollupOptions.output (e.g. compact) being ignored for client-side builds. These top-level Vite build options are now properly forwarded to the client environment, with environment-specific overrides (vite.environments.client.build.*) taking priority when set.
#16819 b5dd8f1 Thanks @astrobot-houston! - Fixes custom elements in MDX files bypassing the renderer pipeline. Custom elements (tags containing hyphens like ) in .mdx files are now routed through registered renderers for SSR, matching the behavior of .astro files. If no renderer claims the element, it falls back to rendering as raw HTML.
#16808 765896c Thanks @ematipico! - Fixes dynamic routes returning 400 Bad Request when the URL contains a literal % character, such as paths built with encodeURIComponent('%?.pdf')
#16804 90d2aca Thanks @jp-knj! - Fixes a v6 regression where astro:i18n could not be imported from client