Clicking "Load answers" to resume a form offers no way back to partially filled form

## Description

Clicking "Load your answers" to resume a form is a destructive action if mid-way through filling it out.

## Steps to reproduce
1. Go to an end user form output with save progress ON
2. Fill out a few pages of answers
3. Click "Load your answers" instead of continue / submit
4. Try to go back

## Expected behaviour
- Expected a way to go back to be able to continue my form if this was not where I wanted to end up, not only "Start blank form"
- Expected "loading answers" could be similar to "submitting"
- Expected right-most button to be main CTA
- Expected a clear way back to the form in progress
- Expected answers to remain in place within the same browser session

## Screenshots or videos

Start by reproducing the issue in the end user form output with save progress enabled, following the listed steps through “Load your answers.” Trace the resume-form flow and its navigation controls. Done means a user can return to the partially filled form, retain answers in the same browser session, and see an unambiguous primary action.

Written by the indexing model from the issue text.