fix(web): correct SVG MIME type to image/svg+xml

[darrenzeng2025]

Summary

Fixes #1410

Go's built-in "mime.TypeByExtension" returns "image/svg" for .svg files, but the correct MIME type per RFC 6838 is "image/svg+xml". This PR registers the correct MIME type when setting up the static file server.

Changes

• Added "mime" package import to web/backend/embed.go
• Added mime.AddExtensionType(".svg", "image/svg+xml") call at the beginning of registerEmbedRoutes()
• Added error handling with warning log if registration fails

Test plan

• Build the web backend: go build ./web/backend/
• Verify SVG files are served with Content-Type: image/svg+xml

🤖 Generated with Claude Code

Co-Authored-By: Claude [email protected]

[Orgmar]

@darrenzeng2025 Good catch on the SVG MIME type issue. Go's built-in mime package returning image/svg instead of image/svg+xml is one of those subtle bugs that can cause real headaches with browser rendering. Clean fix with the error handling too.

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