[WIP] Fix extension UIs displaying as a white window in Vysio

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>[Bug]: Extension UIs display as a white window</issue_title>
<issue_description>## Bug summary
In the latest Vysio release, extensions with their own UI—such as Antigravity and Claude Code—do not render correctly. Their UI appears as a blank white window.

Steps to reproduce

1. Open Vysio.
2. Open VSCode through Codespaces or VSCode.dev.
3. Open an extension UI for Antigravity or Claude Code.
4. Observe that the extension window is completely white.
5. Toggle Lockdown mode and repeat; the issue occurs in both states.

Expected behavior

Extension UIs should render normally and be usable in Vysio, as they are in Safari via Codespaces or VSCode.dev and in Blink Shell's VSCode implementation.

Actual behavior

Extension UIs for Antigravity, Claude Code, and similar extensions display as a blank white window. This is not an issue with the VSCode file, folder, or navigation icons.

Remote provider

GitHub Codespaces / VSCode.dev

Vysio version / build

1.0 (202608271650)

iPad model

iPad (specific model not provided)

iPadOS version

Not provided

Pre-flight checklist

• I searched existing issues and did not find a duplicate.
• I can reproduce this issue on the latest available build.

Logs / screenshots / recordings

Not provided.

Additional context

The problem affects extensions with embedded or custom UI, including Antigravity and Claude Code. Lockdown mode does not affect the issue; the extension UIs remain white whether it is enabled or disabled.</issue_description>

• Closes [Bug]: Extension UIs display as a white window #5

Comments on the Issue (you are @copilot in this section)

• Fixes [Bug]: Extension UIs display as a white window #5