chore: reenable ibc datasets

* feat: use region related components inherit randomized colour
bugfix: Explore btn text colour
chore: reworked threshold for triggering darkmode

* feat: reworked contributor name display

* chore: use short name for version selector

* chore: update help page info

bugfix: mouseOver directive not capturing scanning region properly
feat: reworked region menu component
feat: introduced landmark component
chore: reworked spatial search endpoint

chore: deeper diagnosis

use mni52 labels instead

chore: remove unused style
chore: moved bigbrain cyto map to default parcellation
chore: temporarily disabled viewer pref
chore: change preview file message from dialog to snackbar
chore: added some message for no preview file available
chore: allow undo for pinning/unpinning dataset
chore: moved pinned dataset fab from bottom right to top right
chore: typo Setting -> Settings
feat: minimified layer browser
chore: remoevd Esc remove extra layers

chore: separate spatial search
feat: visually show error