Make editor accessible💡

Currently the editor is not accessible for screen readers because:

1. It does not provide accessible names for interative elements.
2. It relies on non-iteractive elements for interaction.

Proposed solution:

1. Add accessible names to interactive elements via aria-label attribute or visually hidden text.
2. Add role="button" attribute to all interactive elements or (better) use button tag instead of div.
3. Add aria-hidden="true" and focusable="false" to SVG icons.