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Fix: Image widget editor fails to calculate image dimensions (#618)

## Summary:

This fixes an error where images where getting no size information. In addition it also adds preview information to the image editor pane so that content editors get better visibility into what's going on.

![image](https://github.com/Khan/perseus/assets/18454/d4c52e61-56ce-472d-a632-b01cb76a469e)

I think this gives us two ways to catch image problems before they get out to prod: better code and human intervention.

Issue: https://khanacademy.atlassian.net/browse/LC-821

## Test plan:
- Start storybook and play with the widget

Author: nixterrimus

Reviewers: nixterrimus, jeremywiebe

Required Reviewers:

Approved By: jeremywiebe

Checks: ✅ finish_coverage, ✅ Publish npm snapshot (ubuntu-latest, 16.x), ✅ Extract i18n strings (ubuntu-latest, 16.x), ✅ Check builds for changes in size (ubuntu-latest, 16.x), ✅ Lint, Typecheck, and Test (ubuntu-latest, 16.x), ✅ Cypress Coverage (ubuntu-latest, 16.x), ✅ Jest Coverage (ubuntu-latest, 16.x), ✅ Check for .changeset file (ubuntu-latest, 16.x), ✅ gerald

Pull Request URL: https://github.com/Khan/perseus/pull/618

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