maint: toggle parc visib

map not properly displayed

multiple variant meshes
bugfix: fsaverage err URL encoding selected
regions
maint: some simplification

refactor: access export_nehuba
fix: loading pmap

bugfix: showing pmap
bugfix: allow atp selector to work

see src/plugin/{README,MIGRATION}.md for deteails

fix annotation layer

chore: simplify nehuba glue component -> nehuba directive
bugfix: region detail end point encode region id
bugfix: switching space only take first valid parc

feat: region accent in region hierarchy
chore: removed unused functions
refactor: enable threesurfer
chore: slight optimization of atlas selection store

WIP fixing tests

This reverts commit 51393822.

bugfix: context menu in threesurfer

feat: slight enh of perspective zoom behaviour

it also sets global nav state

chore: added mouse over