26b774bb04
When downloading HTML artifacts, the generated HTML now works standalone without requiring the extension runtime. Changes: - Add PrepareHtmlOptions config object to SandboxedIframe.prepareHtmlDocument() - Add isStandalone flag to skip runtime bridge and navigation interceptor - When isStandalone=true: - window.sendRuntimeMessage is NOT defined - Navigation interceptor is NOT injected - Artifact runtime providers fall back to embedded data - HtmlArtifact download button now uses isStandalone: true This fixes the issue where downloaded HTML artifacts would: - Try to call window.sendRuntimeMessage (which would fail silently) - Try to postMessage to non-existent parent window - Not work when opened via file:// protocol Now downloaded artifacts work completely standalone with embedded data.