[FEATURE]: Add `/export` to desktop app

[hparkes-obzervr]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

In the TUI, I can /export to get a Markdown transcript of the conversation. In the desktop app this functionality appears to not be available.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• How to export the session on opencode windows desktop? #19513: Same request — user reports /export is unavailable on the OpenCode desktop app and asks for parity with the CLI/TUI.

If your request is the same, please consider adding a reaction or comment to the existing issue instead of opening a new one.

[hparkes-obzervr]

My appologies, clearly my search for existing issues was non-exhaustive.

[hparkes-obzervr]

I have reopened this because #19513 was closed due to being framed as a question rather than a feature request.

[slipperyduckza]

transcript of the session is absolutely necessary for the desktop app, which I think is a great opencode "containerized" easy to update version. I agree /export should be ported over from the TUI

[chrisoutwright]

I would appreciate this being added. Using /share is not a option as there is also no way to copy the conversation without going to the cloud.