[Loc] Retry if HTML upload to GLaaS failed

If the task in GLaaS has been created successfully, but the consecutive upload of the source file(s) fails, then the project is in a non-recoverable state.
Should there be a retry button? Or is copy project and retry in a fresh project the better / preferable route?

Start by tracing the GLaaS task-creation and source-file upload flow described in the issue, including how failed uploads leave the project. Determine whether the existing entry point can support retry or project copying, then define the user-visible completion criteria and add coverage for the chosen recovery path.

Written by the indexing model from the issue text.