Document the official MIME type for .svelte files

[MichaelDeBoey]

I’m working on improving MIME type support for modern web framework source files across tooling, servers, and content-type databases.

Currently, there does not appear to be an officially documented MIME type for .svelte files.
Some tools/frameworks use conventions such as text/x-<framework>, but there is no authoritative reference from the Svelte project itself.
This create ambiguity for other projects to rely on a consistent mapping.

Having an official statement would help:

• MIME databases include the mapping
• web servers and CDNs configure correct content types
• editors and language servers align
• reduce ecosystem fragmentation

Would the Svelte project be open to document an official recommendation for the MIME type of .svelte files?

This does not necessarily require IANA registration though.
A short note in the docs would already provide a reliable reference for downstream projects I think.

If another MIME type from text/x-svelte (like text/plain, text/html, text/html+svelte, ...) is preferred, documenting that choice would be equally helpful.

Thank you for your work and for considering this!

CC/ @Rich-Harris