Chore: Align theming between light and dark theme in editor

[x] Have you used this PR template? +2 pts
[ ] Is this PR focused on a single, clearly defined change? +5 pts
[ ] Have you linked the issue(s) this PR resolves? +5 pts
[ ] Are your changes well-documented and easy to follow? +5 pts
[ ] Have you introduced a new feature? -4 pts
- [ ] Have you updated/added relevant documentation for it? +4 pts
- [ ] Have you included tests to ensure it works as expected? +5 pts
[ ] Did you alter any core behavior of data-river? -5 pts
- [ ] Have you tested the changes thoroughly, ensuring no regressions? +10 pts

softflow24 / data-river