message: Add ModelExport to viewer/app.ts
diff: @@ -13,6 +13,7 @@ import { GeometryExport } from '../../extensions/geo-export';
  import { MAQualityAssessment } from '../../extensions/model-archive/quality-assessment/behavior';
  import { QualityAssessmentPLDDTPreset, QualityAssessmentQmeanPreset } from '../../extensions/model-archive/quality-assessment/behavior';
  import { QualityAssessment } from '../../extensions/model-archive/quality-assessment/prop';
  +import { ModelExport } from '../../extensions/model-export';
  import { Mp4Export } from '../../extensions/mp4-export';
  import { PDBeStructureQualityReport } from '../../extensions/pdbe';
  import { RCSBAssemblySymmetry, RCSBValidationReport } from '../../extensions/rcsb';
  @@ -57,6 +58,7 @@ const Extensions = {
  'rcsb-validation-report': PluginSpec.Behavior(RCSBValidationReport),
  'anvil-membrane-orientation': PluginSpec.Behavior(ANVILMembraneOrientation),
  'g3d': PluginSpec.Behavior(G3DFormat),
  + 'model-export': PluginSpec.Behavior(ModelExport),
  'mp4-export': PluginSpec.Behavior(Mp4Export),
  'geo-export': PluginSpec.Behavior(GeometryExport),
  'ma-quality-assessment': PluginSpec.Behavior(MAQualityAssessment),
  