fix: darktheme

fix: get ngId for jba29 in big brain
chore: remove priority in http interceptors (caching remains)
chore: update siibra-api schema
fix: show parc desc/url if present
fix: express search for region
feat: region feature categories
fix: mouse context region may be nullish
fix: plugin manifests
monkeypatch: some mapped big brain regions are not defined in
parcellations... see https://github.com/FZJ-INM1-BDA/siibra-python/issues/291
fix: template scale
wip: volumes of interest