Remove Radium from TeacherContentToggle

[Erin007]

Trello card

https://trello.com/c/V4tl5zTF/9-remove-radium-from-apps-src-code-studio-components-teachercontenttogglejs

Summary

• Removes radium import and Radium() HoC wrapper from TeacherContentToggle.js
• Replaces Radium's array-merge style syntax ([baseStyle, condStyle]) with plain object spread: showX ? baseStyle : {...baseStyle, ...hiddenStyle}
• UnconnectedTeacherContentToggle export is now the bare class instead of Radium(TeacherContentToggle)
• All 13 existing unit tests pass without modification

Where to verify

TeacherContentToggle renders in the teacher panel on any level page. Log in as a teacher and visit any student level, then toggle View as → Student to exercise the locked/hidden lesson overlay behavior:

/s/csp1-2023/lessons/1/levels/1 (or any unit with a lockable lesson)

Check that:

• The level content is visible by default in instructor view
• Switching "View as Student" on a locked lesson shows the lock message overlay
• Switching "View as Student" on a hidden lesson shows the hidden message overlay

Test plan

• Visit a level page as a teacher, confirm normal instructor view renders correctly
• Toggle "View as Student" with a locked lesson — lock overlay should appear
• Toggle "View as Student" with a hidden lesson — hidden overlay should appear

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