Video 10096 persist grid settings

[timmydoza]

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Pull Request Details

JIRA link(s):

• VIDEO-10096

Description

This PR updates the app so that the settings related to Grid Mode are persisted between visits (using local storage). A new hook, useLocalStorageState was created so that we don't have to duplicate the same local storage local throughout the app. This hook was also added to the useBackgroundSettings hook to simplify it a little.

Burndown

Before review

• Updated CHANGELOG.md if necessary
• Added unit tests if necessary
• Updated affected documentation
• Verified locally with npm test
• Manually sanity tested running locally
• Included screenshot as PR comment (if needed)
• Ready for review

Before merge

• Got one or more +1s
• Re-tested if necessary