This commits fixes an issue where the `REVERT` label on revert toggle
might render as `REVER` or in a similarly clipped manner due to its
fixed width. The problem is visible when certain fonts fail to load or
browser engines render content non-standardly.
Changes:
- Refactor UI component to have its own separate Vue component with unit
tests.
- Rework component design to utilize flexbox, enhancing its adaptability
and simplifying the structure.
- Remove obselete `webkit` directives.
- Refactor SCSS for clearer structure and better SCSS best-practices.
- Use `em` when possible instead of `px` for improved responsiveness.
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