Refactor Editor Page

[wr1159]

Summary

Refactor editor right column

Changes

• Add loader component
• Saved notification now appears top right
• Editor right column now has its own component

Checklist

• [ ] Test coverage has not deteriorated
• [ ] CI is green
• [x] Added hours into project log
• [x] Strikethrough in sprint google slides.

[github-actions[bot]]

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