add frame-ancestors CSP header to export-and-sign iframe#120

ethankonk merged 2 commits into

maintkhq/frames:mainfrom

leeland/eng-3770-sb-2026-3-frames-based-signing-workflow-vulnerable-to-crosstkhq/frames:leeland/eng-3770-sb-2026-3-frames-based-signing-workflow-vulnerable-to-crossCopy head branch name to clipboard