Comment 3 for bug 2025078

It's an accessibility problem to ask users to cycle through all the errors one by one. We need to create a summary box at the top of the screen (outside the details panel) that lists all the errors found in the dry run, and each error should be linked to the relevant line item. Within each line item, the problem should be highlighted as an error.

The Gov.UK component library has an error summary example that demonstrates what we need to do here: https://design-system.service.gov.uk/components/error-summary/