chore/rf/bugfix (#616)

* chore: added origin dataset for cortical layers
bugfix: pinned datasets (#608)
bugfix: fixed counter of regional features
chore: moved region/DSPrev action btns to banner
chore: removed unused imports
ui: styling of collapse btn from accent to basic

* chore: fixed unit tests

* chore: added unit test for fav dtaset to prevent regression