[1.1] Backport CVE-2026-22254: Sanitize SVGs uploaded to theme assets

[vulgraph]

Backport of upstream fix for CVE-2026-22254 to 1.1.

• Upstream commit: 8a7f74b004 — Sanitize SVGs when uploaded to the theme assets
• Cherry-picked with git cherry-pick -x (original author preserved).

Apply was clean against the current tip of 1.1. No code changes on top of the upstream fix.

This addresses an XSS vector via SVG uploads to the theme asset endpoint that has been fixed on the development line but not yet on 1.1.

What does this PR do?

Backports SVG sanitization on theme asset uploads from the upstream fix.

Notes

• No additional code changes
• Cherry-pick is verbatim (cherry-pick -x), original author preserved

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