[REQUEST] Flux Script Builder error messages produce selectable text.

__Use case:__
Why is this important (helps with prioritizing requests)?
Accelerate debug and improve usability for new users.
__Proposal:__
Short summary of the feature.

The error message produced here does not result in text which can be selected for e.g. LLM assistance with debugging.

__Current behaviour:__
Describe what currently happens.
See above
__Desired behaviour:__
Describe what you want.
To be able to select relevant textual information within the webui.
__Alternatives considered:__
Describe other solutions or features you considered.
Currently using screengrabs.

Start in the Flux Script Builder web UI and reproduce the error shown in the attached image. Identify where the error text is rendered, then verify that the relevant information can be selected and copied as text rather than only captured in a screenshot.

Written by the indexing model from the issue text.