Perseus in Coach full width - some coach alignment fixes

[nucleogenesis]

Summary

When not in interactive mode, the Perseus renderer was unnecessarily showing the hints KFixedGridItem, causing the actual quiz content to be half-width. This hides it with v-show so that the content renders properly and the grid spans are adjusted accordingly.

(っ◔◡◔)っ ♥ Bonus fixes ♥

1. Coach content icon was defaulting too 100% width making it drop to a newline - a width: auto style took care of that business.

Before	After

2. (hacky) The backlink was hugging the top on a couple reports and misaligned with the Preview button so I put some /deep/ CSS and a TODO in there. HeaderWithOptions needs refactor and I can do it but wanted to get the fix in for the deadline. I can do a more robust fix next week or over the Holidays depending on priorities.

Before	After
	!

References

Fixes #8834

Reviewer guidance

Go look at Quiz reports and make sure questions are full width. Then go make a quiz and verify the same.

---

Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[rtibbles]

(hacky) The backlink was hugging the top on a couple reports and misaligned with the Preview button so I put some /deep/ CSS and a TODO in there. HeaderWithOptions needs refactor and I can do it but wanted to get the fix in for the deadline. I can do a more robust fix next week or over the Holidays depending on priorities.

Can probably leave this, as it should already be cleaned up on develop.

[rtibbles]

Code looks good.

[radinamatic]

coach resource icon	back link
Looks ✔️ in full width, but was it supposed to disappear on smaller sized screens?	✔️ (we can add some top padding later for narrower screens)

[radinamatic]

Seems that what I commented on predates this PR, so we are good to go!