maint: added css to vanilla.html

minor refactor

TODO:

- annotation
- real space not yet available
- nehuba status panel busted
- check swc works

generally working with the following caveats:

- fsaverage busted
- annotation not yet working
- colin27 busted
- real space interpolation values not yet available
- (as a result of above) nehuba status panel not yet working

ALSO TO CHECK:
- swc

... persistence)
maint: added markdown descriptor for slice view quick starter guide
fix: fixed neuron messing, passing message to api service if not found
fix: api method typos

maint: external precomputed layer now fetches and sets transform

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

chore: introduce min width for smart chip
feat: improve perf mesh loading
fix: reset panel mode/panel order

fix: atlas order
fix: parcellation/space short names
chore: added parcellation name to region banner
chore: removed parcellation name from  feature banner
ui: reintroduced badge, move num of entity to badge
fix: show connectivity only in human, only on jba29
feat: always show ng layer ctrl on voi
chore: do not show Unknown category
fix: pip style
chore: select jba3 by default over jba29
fix: pip minimap is not updated on new template

chore: add is group pipe guard
feat: add veil to readmore component
chore: reworked how voi is shown
bugfix: getParcNgId properly returns null if region is null'ish

bugfix: annotation mode works again

bugfix: voi click interceptor
chore: add spinner to ng layer ctrl while loading
chore: use dvh on body and html

feat: voi
chore: extracted ng layer ctl to its own module
fix: navigation state/route race condition
fix: use useViewer state on generalApplyState
fix: layer ctrl generalise layer id (prev only applied to pmap)
refactor: nehuba module
feat: enable voi query

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

refactor: access export_nehuba
fix: loading pmap

bugfix: showing pmap
bugfix: allow atp selector to work

chore: remove used sapi.service methods