Outsource custom GUI class components to dashgui library

Move reusable GUI primitives (PanelTile, EditablePanelTile, base Tile,
ElevatedPill, SingleLineTextEdit) into the shared dashgui package and
consume them via a file: dependency. EditablePanelTile now accepts an
onError prop so error notification stays app-side.

src/components/article/boxes/ArticleViewEANs.jsx

@@ -3,10 +3,11 @@ import Autocomplete from '@mui/material/Autocomplete';
 import TextField from '@mui/material/TextField';
 import Typography from '@mui/material/Typography';
 import Box from '@mui/material/Box';
-import { EditablePanelTile } from '../../panels';
+import { EditablePanelTile } from 'dashgui/panels';
 import { StorageManagerContext } from '../../../api/storageManagerContext';
 import { requireObject } from '../../../utils/apiShape';
 import { articleEans } from '../../../utils/articleDetail';
+import { notifyError } from '../../../utils/notify';
 class PanelValue extends Component {
   render() {
     const { label, children } = this.props;
@@ -115,6 +116,7 @@ export default class ArticleViewEANs extends PureComponent {
         contentAlignItems="flex-start"
         value={value}
         onSave={this.handleSave}
+        onError={notifyError}
         isDirty={eansDraftDirty}
         canSave={eansDraftValid}
         display={<EansDisplay sku={articleData.sku} eans={value.eans} />}