style(MC Authoring): UI Improvements

[hirokiterashima]

Notes

Please style as you see fit.

• I couldn't get the add choice button and the move choice up/down buttons to align vertically.
• The delete choice button could also be closer to the top-right corner of the choice box.
• Maybe distinguish the "Choices" section a little bit somehow?

Changes

• Added button to allow adding new choices at any position. Before, it only let you add a new choice at the end
• Moved move up/down buttons to the right of the choices, similar to moving components up/down in node editing view
• Moved delete choice button to the top right corner of the choice box

Test

• Above works as described

[qltysh]

Coverage Impact

Unable to calculate total coverage change because base branch coverage was not found.

Modified Files with Diff Coverage (3)

Rating	File	% Diff	Uncovered Line #s
	...multiple-choice-authoring/multiple-choice-authoring.harness.ts	100.0%
	...onents/multipleChoice/add-mc-choice/add-mc-choice.component.ts	100.0%
	...ltiple-choice-authoring/multiple-choice-authoring.component.ts	100.0%
	Total	100.0%

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[breity]

Looks good. 👍

I cleaned up styles, layout, and responsiveness.