Update to Angular v21. Add damping development option for Spectra app. Fix compodoc. https://code.usgs.gov/ghsc/nshmp/nshmp-apps/-/merge_requests/681 https://code.usgs.gov/ghsc/nshmp/nshmp-apps/-/merge_requests/682 https://code.usgs.gov/ghsc/nshmp/nshmp-apps/-/merge_requests/683 https://code.usgs.gov/ghsc/nshmp/nshmp-apps/-/merge_requests/684