u

.cursor/rules/no-silent-fallbacks.mdc

@@ -0,0 +1,87 @@
+---
+description: Keine Fallbacks, keine alternativen API-Felder oder Endpoints
+alwaysApply: true
+---
+
+# Keine Fallbacks, keine alternativen APIs
+
+Stille Fallbacks und parallele API-Verträge verschleiern Fehler und entwerten Tests. Fehlende oder falsche Daten müssen **sichtbar** scheitern — nicht durch Ersatzwerte kaschiert werden.
+
+## Verboten
+
+### Alternative Feldnamen / Response-Formen
+
+```js
+// ❌
+const nodes = data?.tree ?? data?.categories ?? [];
+const target = article.sku ?? article.slug ?? article.id;
+const rootId = data.rootCategoryId ?? companyRootCategoryId ?? null;
+
+// ✅
+requireObject(data, 'category/tree');
+const nodes = requireArray(data.tree, 'category/tree.tree');
+const rootId = data.rootCategoryId ?? companyRootCategoryId;
+requireDefined(rootId, 'rootCategoryId');
+```
+
+Ein Endpoint, ein Shape, ein Feldname — dokumentiert in `src/api/index.js`.
+
+### Alternative Endpoints für denselben Zweck
+
+```js
+// ❌ Zwei Wege für dieselben Daten
+category.getTree();
+http('/api/article/byCategory?...');
+
+// ✅ Nur der vereinbarte Endpoint
+category.getArticles(categoryId);
+```
+
+Neue Endpoints nur nach expliziter Vereinbarung; alte nicht parallel als Fallback behalten.
+
+### Default-Werte beim Parsen / in Selectors
+
+```js
+// ❌
+selectCompanyIso639 = (s) => s.company.current?.iso639 ?? 'de';
+name: raw.name ?? 'Unbenannt';
+
+// ✅
+selectCompanyIso639 = (s) => s.company.current?.iso639;
+// UI zeigt leer oder Fehler, wenn null
+```
+
+### Display-Platzhalter für fehlende Daten
+
+```js
+// ❌
+<TableCell>{row.cName || '—'}</TableCell>
+label={`Kategorie ${id}`}
+
+// ✅
+<TableCell>{row.cName}</TableCell>
+// oder gar nicht rendern
+```
+
+### Ersatz-Identifikatoren in URLs
+
+```js
+// ❌
+/artikel/${sku ?? slug ?? id}
+
+// ✅
+/artikel/${sku}  — nur wenn sku gesetzt, sonst disabled / kein Link
+```
+
+## Erlaubt
+
+- **Formular-Startwerte** beim Öffnen eines leeren Dialogs (z. B. `defaultIso639()` für Neuanlage)
+- **Explizite Fehlerbehandlung:** `requireObject` / `requireArray` / `requireDefined` aus `src/utils/apiShape.js` → Thunk rejected → `BackendError`
+- **Optionale Vertragsfelder** nur wenn im API-Vertrag als optional dokumentiert (z. B. `sort` in Sort-Comparator)
+
+## Bei neuem Code
+
+1. API-Vertrag in `src/api/index.js` kommentieren
+2. Antwort mit `apiShape`-Helfern validieren
+3. Kein `??`-Ketten für „vielleicht heißt es anders“
+4. Fehler im UI anzeigen, nicht durch Defaults überdecken

src/App.jsx

@@ -11,6 +11,7 @@ import SectionLayout from './components/SectionLayout';
 
 const ArtikelUebersichtPage = lazy(() => import('./pages/artikel/index'));
 const ArtikelKategorienPage = lazy(() => import('./pages/artikel/kategorien'));
+const RedirectArtikelKategorien = lazy(() => import('./pages/artikel/RedirectArtikelKategorien'));
 const ArtikelLagerPage = lazy(() => import('./pages/artikel/lager'));
 const ArtikelSkuPage = lazy(() => import('./pages/artikel/sku'));
 const LieferungPage = lazy(() => import('./pages/lieferung/index'));
@@ -73,9 +74,12 @@ class App extends Component {
               <Route index element={<Navigate to="/artikel" replace />} />
               <Route path="lieferung" element={<LieferungPage />} />
               <Route path="infos" element={<InfosPage />} />
+              <Route path="kategorien/*" element={<SectionLayout sectionPath="/artikel" />}>
+                <Route path="*" element={<ArtikelKategorienPage />} />
+              </Route>
               <Route path="artikel" element={<SectionLayout sectionPath="/artikel" />}>
                 <Route index element={<ArtikelUebersichtPage />} />
-                <Route path="kategorien" element={<ArtikelKategorienPage />} />
+                <Route path="kategorien/*" element={<RedirectArtikelKategorien />} />
                 <Route path="lager" element={<ArtikelLagerPage />} />
                 <Route path=":sku" element={<ArtikelSkuPage />} />
               </Route>

src/api/index.js

@@ -90,33 +90,54 @@ export const article = {
     return http(`/api/article/search?${params}`);
   },
 
-  get({ target } = {}) {
-    const params = new URLSearchParams({ target });
-    return http(`/api/article/get?${params}`);
+  /** GET /api/article/:sku → { article: { id, sku, name, slug, net, taxRate, fatherArticleId, fatherSku, … } } */
+  getBySku(sku) {
+    return http(`/api/article/${encodeURIComponent(sku)}`);
+  },
+
+  /** POST /api/article → 201 { article } */
+  create({ parentId, name }) {
+    return http('/api/article', {
+      method: 'POST',
+      body: { parentId, name },
+    });
   },
 
   /**
-   * GET /api/article/byCategory?categoryId&offset&maxCount
-   * Articles assigned to a category (for tile view).
+   * PATCH /api/article/:sku
+   * Body: partial fields, e.g. { name }
+   * → 200 { article }
    */
-  byCategory({ categoryId, offset, maxCount } = {}) {
-    const params = new URLSearchParams({ categoryId: String(categoryId) });
-    if (offset) params.set('offset', String(offset));
-    if (maxCount != null) params.set('maxCount', String(maxCount));
-    return http(`/api/article/byCategory?${params}`);
+  update(sku, body) {
+    return http(`/api/article/${encodeURIComponent(sku)}`, {
+      method: 'PATCH',
+      body,
+    });
   },
 };
 
 export const category = {
-  /**
-   * GET /api/category/tree?companyId=
-   * Flat map of categories keyed by id; rootCategoryId resolved server-side.
-   */
-  getTree({ companyId } = {}) {
-    const params = new URLSearchParams();
-    if (companyId != null) params.set('companyId', String(companyId));
-    const qs = params.toString();
-    return http(`/api/category/tree${qs ? `?${qs}` : ''}`);
+  /** GET /api/category/tree → { languageId, tree, articles } (company from session) */
+  getTree() {
+    return http('/api/category/tree');
+  },
+
+  /** GET /api/category/:id/articles → { articles: [...] } */
+  getArticles(categoryId) {
+    return http(`/api/category/${categoryId}/articles`);
+  },
+
+  /** POST /api/category → 201 { category } */
+  create({ parentId, name }) {
+    return http('/api/category', {
+      method: 'POST',
+      body: { parentId, name },
+    });
+  },
+
+  /** DELETE /api/category/:id → 204 */
+  delete(categoryId) {
+    return http(`/api/category/${categoryId}`, { method: 'DELETE' });
   },
 };
 

src/components/CompanySettingsDialog.jsx

@@ -60,7 +60,7 @@ class CompanySettingsDialog extends Component {
   syncFormFromCompany(company) {
     this.setState({
       name: company.name ?? '',
-      iso639: company.iso639 ?? 'de',
+      iso639: company.iso639,
       taxrate: company.taxrate != null ? String(company.taxrate) : '',
       reducedtaxrate: company.reducedtaxrate != null ? String(company.reducedtaxrate) : '',
     });

src/components/NameDialog.jsx

@@ -0,0 +1,107 @@
+import { Component } from 'react';
+import Box from '@mui/material/Box';
+import Button from '@mui/material/Button';
+import Dialog from '@mui/material/Dialog';
+import DialogActions from '@mui/material/DialogActions';
+import DialogContent from '@mui/material/DialogContent';
+import DialogTitle from '@mui/material/DialogTitle';
+import TextField from '@mui/material/TextField';
+import Alert from '@mui/material/Alert';
+import BackendError from './BackendError';
+import { backendErrorFrom, isBackendFailure } from '../utils/backendError';
+
+/**
+ * Single-field name dialog (create/edit).
+ * Props: open, title, submitLabel, onClose, onSubmit({ name }),
+ * optional initialName (form start value when opened).
+ */
+class NameDialog extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      name: '',
+      busy: false,
+      error: null,
+    };
+    this.handleSubmit = this.handleSubmit.bind(this);
+    this.handleClose = this.handleClose.bind(this);
+  }
+
+  componentDidUpdate(prevProps) {
+    if (this.props.open && !prevProps.open) {
+      this.setState({
+        name: this.props.initialName ?? '',
+        busy: false,
+        error: null,
+      });
+    }
+  }
+
+  handleClose() {
+    if (this.state.busy) return;
+    this.props.onClose();
+  }
+
+  async handleSubmit(event) {
+    event.preventDefault();
+    const name = this.state.name.trim();
+    if (!name) {
+      this.setState({ error: 'Bitte Name eingeben.' });
+      return;
+    }
+
+    this.setState({ busy: true, error: null });
+    try {
+      await this.props.onSubmit({ name });
+      this.props.onClose();
+    } catch (err) {
+      this.setState({ error: backendErrorFrom(err), busy: false });
+    }
+  }
+
+  render() {
+    const { open, title, submitLabel } = this.props;
+    const { name, busy, error } = this.state;
+    const canSave = name.trim() !== '';
+
+    return (
+      <Dialog open={open} onClose={this.handleClose} maxWidth="xs" fullWidth>
+        <DialogTitle>{title}</DialogTitle>
+        <Box component="form" onSubmit={this.handleSubmit} noValidate>
+          <DialogContent>
+            {error ? (
+              isBackendFailure(error) ? (
+                <BackendError error={error} sx={{ mb: 2 }} />
+              ) : (
+                <Alert severity="error" sx={{ mb: 2 }}>
+                  {typeof error === 'string' ? error : error.message}
+                </Alert>
+              )
+            ) : null}
+
+            <TextField
+              fullWidth
+              required
+              autoFocus
+              label="Name"
+              value={name}
+              disabled={busy}
+              onChange={(e) => this.setState({ name: e.target.value })}
+              autoComplete="off"
+            />
+          </DialogContent>
+          <DialogActions sx={{ px: 3, pb: 2 }}>
+            <Button type="button" onClick={this.handleClose} disabled={busy}>
+              Abbrechen
+            </Button>
+            <Button type="submit" variant="contained" disabled={busy || !canSave}>
+              {submitLabel}
+            </Button>
+          </DialogActions>
+        </Box>
+      </Dialog>
+    );
+  }
+}
+
+export default NameDialog;

src/components/PageLayout.jsx

@@ -4,21 +4,24 @@ import Tooltip from '@mui/material/Tooltip';
 import Typography from '@mui/material/Typography';
 import { useLocation, useNavigate } from 'react-router-dom';
 import { artikelQueryPath } from '../pages/artikel/artikelQuery';
+import { defaultCategoryPath, isKategorienPath } from '../pages/artikel/categoryRoute';
 
 const SUB_NAV_WIDTH = 80;
 
 function isSubNavActive(pathname, basePath, segment, knownSegments) {
   if (!segment) {
     if (pathname === basePath || pathname === `${basePath}/`) return true;
-    // /artikel/:sku detail — highlight overview, not kategorien/lager
     const rest = pathname.slice(basePath.length).replace(/^\//, '');
     return Boolean(rest) && !rest.includes('/') && !knownSegments.has(rest);
   }
+  if (segment === 'kategorien') {
+    return isKategorienPath(pathname);
+  }
   const subPath = `${basePath}/${segment}`;
   return pathname === subPath || pathname === `${subPath}/`;
 }
 
-export default function PageLayout({ title, subNav, basePath, children }) {
+export default function PageLayout({ title, showTitle = true, subNav, basePath, children }) {
   const hasSubNav = subNav?.length > 0;
   const navigate = useNavigate();
   const { pathname } = useLocation();
@@ -55,6 +58,10 @@ export default function PageLayout({ title, subNav, basePath, children }) {
                       navigate(artikelQueryPath());
                       return;
                     }
+                    if (segment === 'kategorien') {
+                      navigate(defaultCategoryPath());
+                      return;
+                    }
                     navigate(segment ? `${basePath}/${segment}` : basePath);
                   }}
                   sx={(theme) => ({
@@ -77,9 +84,11 @@ export default function PageLayout({ title, subNav, basePath, children }) {
       </Box>
 
       <Box sx={{ flexGrow: 1, minWidth: 0 }}>
-        <Typography variant="h5" sx={{ fontWeight: 700, mb: 2 }}>
-          {title}
-        </Typography>
+        {showTitle ? (
+          <Typography variant="h5" sx={{ fontWeight: 700, mb: 2 }}>
+            {title}
+          </Typography>
+        ) : null}
         {children}
       </Box>
     </Box>

src/components/SectionLayout.jsx

@@ -1,27 +1,34 @@
 import { Outlet, useLocation } from 'react-router-dom';
 import PageLayout from './PageLayout';
 import { NAV_ITEMS, SUB_NAV } from '../nav';
+import { isKategorienPath } from '../pages/artikel/categoryRoute';
 
 export default function SectionLayout({ sectionPath }) {
   const { pathname } = useLocation();
   const title = NAV_ITEMS.find((item) => item.path === sectionPath)?.label ?? '';
   const subNav = SUB_NAV[sectionPath];
   const activeSub = subNav?.find((item) => {
+    if (item.segment === 'kategorien') {
+      return isKategorienPath(pathname);
+    }
     const subPath = item.segment ? `${sectionPath}/${item.segment}` : sectionPath;
     return pathname === subPath || pathname === `${subPath}/`;
   });
 
   const knownSegments = new Set((subNav ?? []).map((item) => item.segment).filter(Boolean));
   const rest = pathname.slice(sectionPath.length).replace(/^\//, '').split('/')[0];
-  const detailSku =
-    sectionPath === '/artikel' && rest && !knownSegments.has(rest)
-      ? decodeURIComponent(rest)
-      : null;
+  const isArticleDetail =
+    sectionPath === '/artikel' &&
+    !isKategorienPath(pathname) &&
+    rest &&
+    !knownSegments.has(rest);
 
-  const pageTitle = detailSku ?? (activeSub && subNav ? activeSub.label : title);
+  const pageTitle = isArticleDetail
+    ? title
+    : (activeSub?.label ?? title);
 
   return (
-    <PageLayout title={pageTitle} subNav={subNav} basePath={sectionPath}>
+    <PageLayout title={pageTitle} showTitle={!isArticleDetail} subNav={subNav} basePath={sectionPath}>
       <Outlet />
     </PageLayout>
   );

src/components/article/ArticleNameDialog.jsx

@@ -0,0 +1,13 @@
+import NameDialog from '../NameDialog';
+
+export default function ArticleNameDialog({ open, onClose, onSubmit }) {
+  return (
+    <NameDialog
+      open={open}
+      title="Neuer Artikel"
+      submitLabel="Anlegen"
+      onClose={onClose}
+      onSubmit={onSubmit}
+    />
+  );
+}

src/components/article/ArticleView.jsx

@@ -0,0 +1,209 @@
+import { Link as RouterLink } from 'react-router-dom';
+import Box from '@mui/material/Box';
+import Link from '@mui/material/Link';
+import TextField from '@mui/material/TextField';
+import Typography from '@mui/material/Typography';
+import { article } from '../../api';
+import { EditablePanelTile, PanelTile, PanelTileGrid } from '../panels';
+import { requireObject } from '../../utils/apiShape';
+import { formatPrice } from '../../utils/price';
+import { formatStock } from '../../pages/artikel/searchFormat';
+
+function PanelValue({ label, children }) {
+  if (children == null || children === '') return null;
+  return (
+    <Box sx={{ mb: 1 }}>
+      {label ? (
+        <Typography variant="caption" color="text.secondary" display="block">
+          {label}
+        </Typography>
+      ) : null}
+      <Typography variant="body2" component="div">
+        {children}
+      </Typography>
+    </Box>
+  );
+}
+
+function ArticlePhoto() {
+  return (
+    <Box
+      sx={{
+        width: 200,
+        height: 200,
+        maxWidth: '100%',
+        bgcolor: 'action.hover',
+        borderRadius: 1,
+      }}
+    />
+  );
+}
+
+const headerTileSx = {
+  p: 1.25,
+  minHeight: 0,
+};
+
+function CountLine({ label, count }) {
+  if (count == null) return null;
+  return (
+    <Typography variant="body2">
+      {label}: {count}
+    </Typography>
+  );
+}
+
+function RelationLine({ label, active, children }) {
+  return (
+    <Typography variant="body2" sx={{ mb: 0.5 }}>
+      {label}:{' '}
+      {active ? (
+        children ?? 'ja'
+      ) : (
+        <Typography component="span" variant="body2" color="text.secondary">
+          nein
+        </Typography>
+      )}
+    </Typography>
+  );
+}
+
+function articleBrutto(article) {
+  if (article.net == null || article.taxRate == null) return null;
+  return article.net * (1 + article.taxRate / 100);
+}
+
+function nameDraftDirty(draft, saved) {
+  return draft.name.trim() !== String(saved.name ?? '').trim();
+}
+
+function nameDraftValid(draft) {
+  return draft.name.trim().length > 0;
+}
+
+export default function ArticleView({ article: articleData, onArticleUpdated }) {
+  const brutto = articleBrutto(articleData);
+
+  const handleSaveName = async (draft) => {
+    const name = draft.name.trim();
+    const res = await article.update(articleData.sku, { name });
+    requireObject(res, 'PATCH /api/article/:sku');
+    requireObject(res.article, 'article');
+    onArticleUpdated?.(res.article);
+  };
+
+  return (
+    <PanelTileGrid>
+      <EditablePanelTile
+        wide={3}
+        minHeight={0}
+        sx={headerTileSx}
+        value={{ name: articleData.name ?? '' }}
+        onSave={handleSaveName}
+        isDirty={nameDraftDirty}
+        canSave={nameDraftValid}
+        renderDisplay={({ name }) => (
+          <Box
+            sx={{
+              display: 'flex',
+              alignItems: 'center',
+              minHeight: { xs: 0, sm: 200 },
+              pr: 4,
+            }}
+          >
+            <Typography variant="h6" sx={{ fontWeight: 700, lineHeight: 1.25 }}>
+              {name}
+            </Typography>
+          </Box>
+        )}
+        renderEdit={(draft, onChange, inputRef) => (
+          <Box
+            sx={{
+              display: 'flex',
+              alignItems: 'center',
+              minHeight: { xs: 0, sm: 200 },
+            }}
+          >
+            <TextField
+              inputRef={inputRef}
+              fullWidth
+              variant="standard"
+              value={draft.name}
+              onChange={(event) => onChange({ name: event.target.value })}
+              sx={{
+                '& .MuiInput-input': {
+                  fontSize: '1.25rem',
+                  fontWeight: 700,
+                  lineHeight: 1.25,
+                },
+              }}
+            />
+          </Box>
+        )}
+      />
+
+      <PanelTile wide={1} minHeight={0} sx={headerTileSx}>
+        <ArticlePhoto />
+      </PanelTile>
+
+      <PanelTile wide={1} title="Bestand">
+        <PanelValue>
+          {articleData.stock != null ? formatStock(articleData.stock) : null}
+        </PanelValue>
+      </PanelTile>
+
+      <PanelTile wide={1} title="Marke">
+        <PanelValue>{articleData.brand}</PanelValue>
+      </PanelTile>
+
+      <PanelTile wide={1} title="SKU / EAN">
+        <PanelValue label="SKU">{articleData.sku}</PanelValue>
+        <PanelValue label="EAN">{articleData.ean}</PanelValue>
+      </PanelTile>
+
+      <PanelTile wide={1} title="Preis">
+        <PanelValue label="Netto">
+          {articleData.net != null ? formatPrice(articleData.net) : null}
+        </PanelValue>
+        <PanelValue label="MwSt.">
+          {articleData.taxRate != null ? `${articleData.taxRate} %` : null}
+        </PanelValue>
+        <PanelValue label="Brutto">
+          {brutto != null ? formatPrice(brutto) : null}
+        </PanelValue>
+      </PanelTile>
+
+      <PanelTile wide={3} title="SEO & Beschreibung" minHeight={200}>
+        <PanelValue label="Slug">{articleData.slug}</PanelValue>
+        <PanelValue label="SEO-Titel">{articleData.seoTitle}</PanelValue>
+        <PanelValue label="SEO-Beschreibung">{articleData.seoDescription}</PanelValue>
+        <PanelValue label="Beschreibung">{articleData.description}</PanelValue>
+      </PanelTile>
+
+      <PanelTile wide={1} title="Listen" minHeight={200}>
+        <RelationLine
+          label="Vaterartikel"
+          active={articleData.childCount > 0}
+        >
+          {articleData.childCount}
+        </RelationLine>
+        <RelationLine
+          label="Kindartikel"
+          active={articleData.fatherArticleId != null}
+        >
+          {articleData.fatherSku ? (
+            <Link
+              component={RouterLink}
+              to={`/artikel/${encodeURIComponent(articleData.fatherSku)}`}
+            >
+              {articleData.fatherSku}
+            </Link>
+          ) : null}
+        </RelationLine>
+        <CountLine label="Optionen" count={articleData.optionsCount} />
+        <CountLine label="Stücklisten" count={articleData.articleListCount} />
+        <CountLine label="Varianten" count={articleData.childCount} />
+      </PanelTile>
+    </PanelTileGrid>
+  );
+}

src/components/article/NewArticleTile.jsx

@@ -0,0 +1,58 @@
+import { Component } from 'react';
+import { connect } from 'react-redux';
+import { enqueueSnackbar } from 'notistack';
+import { ActionTile } from '../tiles';
+import { createArticle as createArticleThunk } from '../../store/categorySlice';
+import ArticleNameDialog from './ArticleNameDialog';
+
+class NewArticleTile extends Component {
+  constructor(props) {
+    super(props);
+    this.state = { open: false };
+    this.handleOpen = this.handleOpen.bind(this);
+    this.handleClose = this.handleClose.bind(this);
+    this.handleSubmit = this.handleSubmit.bind(this);
+  }
+
+  handleOpen() {
+    this.setState({ open: true });
+  }
+
+  handleClose() {
+    this.setState({ open: false });
+  }
+
+  async handleSubmit({ name }) {
+    const { parentId } = this.props;
+    const article = await this.props.createArticle({ parentId, name }).unwrap();
+    enqueueSnackbar('Artikel angelegt.', { variant: 'success' });
+    if (article) {
+      this.props.onOpenArticle?.(article);
+    }
+  }
+
+  render() {
+    const { parentId, disabled } = this.props;
+
+    return (
+      <>
+        <ActionTile
+          label="Neuer Artikel"
+          disabled={disabled || parentId == null}
+          onClick={this.handleOpen}
+        />
+        <ArticleNameDialog
+          open={this.state.open}
+          onClose={this.handleClose}
+          onSubmit={this.handleSubmit}
+        />
+      </>
+    );
+  }
+}
+
+const mapDispatchToProps = {
+  createArticle: createArticleThunk,
+};
+
+export default connect(null, mapDispatchToProps)(NewArticleTile);

src/components/article/index.js

@@ -0,0 +1,3 @@
+export { default as ArticleView } from './ArticleView';
+export { default as ArticleNameDialog } from './ArticleNameDialog';
+export { default as NewArticleTile } from './NewArticleTile';

src/components/category/CategoryBreadcrumbs.jsx

@@ -0,0 +1,42 @@
+import { Component } from 'react';
+import Breadcrumbs from '@mui/material/Breadcrumbs';
+import Link from '@mui/material/Link';
+
+class CategoryBreadcrumbs extends Component {
+  handleNavigate = (categoryId) => {
+    this.props.onNavigate(categoryId);
+  };
+
+  render() {
+    const { crumbs } = this.props;
+    const visible = (crumbs ?? []).filter((crumb) => crumb.name);
+    if (visible.length === 0) return null;
+
+    return (
+      <Breadcrumbs sx={{ mb: 2 }} aria-label="Kategoriepfad">
+        {visible.map((crumb, index) => (
+          <Link
+            key={crumb.id}
+            component="button"
+            type="button"
+            variant="body2"
+            underline="always"
+            color="inherit"
+            aria-current={index === visible.length - 1 ? 'page' : undefined}
+            onClick={() => this.handleNavigate(crumb.id)}
+            sx={{
+              fontWeight: 600,
+              lineHeight: 1.43,
+              p: 0,
+              minWidth: 0,
+            }}
+          >
+            {crumb.name}
+          </Link>
+        ))}
+      </Breadcrumbs>
+    );
+  }
+}
+
+export default CategoryBreadcrumbs;

src/components/category/CategoryNameDialog.jsx

@@ -0,0 +1,30 @@
+import NameDialog from '../NameDialog';
+
+const TITLES = {
+  create: 'Neue Kategorie',
+  edit: 'Kategorie bearbeiten',
+};
+
+const SUBMIT_LABELS = {
+  create: 'Anlegen',
+  edit: 'Speichern',
+};
+
+export default function CategoryNameDialog({
+  open,
+  mode = 'create',
+  initialName,
+  onClose,
+  onSubmit,
+}) {
+  return (
+    <NameDialog
+      open={open}
+      title={TITLES[mode]}
+      submitLabel={SUBMIT_LABELS[mode]}
+      initialName={initialName}
+      onClose={onClose}
+      onSubmit={onSubmit}
+    />
+  );
+}

src/components/category/EditCategoryDialog.jsx

@@ -0,0 +1,21 @@
+import { Component } from 'react';
+import CategoryNameDialog from './CategoryNameDialog';
+
+/** Edit flow — wire onSubmit when PUT /api/category/:id exists. */
+class EditCategoryDialog extends Component {
+  render() {
+    const { open, onClose, initialName, onSubmit } = this.props;
+
+    return (
+      <CategoryNameDialog
+        open={open}
+        mode="edit"
+        initialName={initialName}
+        onClose={onClose}
+        onSubmit={onSubmit}
+      />
+    );
+  }
+}
+
+export default EditCategoryDialog;

src/components/category/NewCategoryTile.jsx

@@ -0,0 +1,56 @@
+import { Component } from 'react';
+import { connect } from 'react-redux';
+import { enqueueSnackbar } from 'notistack';
+import { ActionTile } from '../tiles';
+import { createCategory as createCategoryThunk } from '../../store/categorySlice';
+import CategoryNameDialog from './CategoryNameDialog';
+
+class NewCategoryTile extends Component {
+  constructor(props) {
+    super(props);
+    this.state = { open: false };
+    this.handleOpen = this.handleOpen.bind(this);
+    this.handleClose = this.handleClose.bind(this);
+    this.handleSubmit = this.handleSubmit.bind(this);
+  }
+
+  handleOpen() {
+    this.setState({ open: true });
+  }
+
+  handleClose() {
+    this.setState({ open: false });
+  }
+
+  async handleSubmit({ name }) {
+    const { parentId } = this.props;
+    await this.props.createCategory({ parentId, name }).unwrap();
+    enqueueSnackbar('Kategorie angelegt.', { variant: 'success' });
+  }
+
+  render() {
+    const { parentId, disabled } = this.props;
+
+    return (
+      <>
+        <ActionTile
+          label="Neue Kategorie"
+          disabled={disabled || parentId == null}
+          onClick={this.handleOpen}
+        />
+        <CategoryNameDialog
+          open={this.state.open}
+          mode="create"
+          onClose={this.handleClose}
+          onSubmit={this.handleSubmit}
+        />
+      </>
+    );
+  }
+}
+
+const mapDispatchToProps = {
+  createCategory: createCategoryThunk,
+};
+
+export default connect(null, mapDispatchToProps)(NewCategoryTile);

src/components/category/index.js

@@ -0,0 +1,4 @@
+export { default as CategoryNameDialog } from './CategoryNameDialog';
+export { default as CategoryBreadcrumbs } from './CategoryBreadcrumbs';
+export { default as NewCategoryTile } from './NewCategoryTile';
+export { default as EditCategoryDialog } from './EditCategoryDialog';

src/components/panels/EditablePanelTile.jsx

@@ -0,0 +1,204 @@
+import { Component, createRef } from 'react';
+import CloseOutlinedIcon from '@mui/icons-material/CloseOutlined';
+import EditOutlinedIcon from '@mui/icons-material/EditOutlined';
+import SaveOutlinedIcon from '@mui/icons-material/SaveOutlined';
+import Alert from '@mui/material/Alert';
+import Box from '@mui/material/Box';
+import CircularProgress from '@mui/material/CircularProgress';
+import IconButton from '@mui/material/IconButton';
+import Paper from '@mui/material/Paper';
+import Typography from '@mui/material/Typography';
+import { enqueueSnackbar } from 'notistack';
+import { backendErrorFrom } from '../../utils/backendError';
+import { panelTilePaperSx } from './panelTileLayout';
+
+function valuesEqual(a, b) {
+  return JSON.stringify(a) === JSON.stringify(b);
+}
+
+/**
+ * Panel tile with centralized inline-edit chrome.
+ * Pass `onSave` to enable edit UI; omit it for read-only tiles (no edit icon).
+ */
+export class EditablePanelTile extends Component {
+  constructor(props) {
+    super(props);
+    this.inputRef = createRef();
+    this.state = {
+      editing: false,
+      draft: null,
+      saving: false,
+      error: null,
+    };
+  }
+
+  componentDidUpdate(_prevProps, prevState) {
+    if (!prevState.editing && this.state.editing) {
+      this.inputRef.current?.focus();
+    }
+  }
+
+  getSavedValue() {
+    return this.props.value;
+  }
+
+  isDirty() {
+    const { draft, editing } = this.state;
+    if (!editing || draft == null) return false;
+    if (this.props.isDirty) {
+      return this.props.isDirty(draft, this.getSavedValue());
+    }
+    return !valuesEqual(draft, this.getSavedValue());
+  }
+
+  canSave() {
+    const { draft, saving } = this.state;
+    if (saving || !this.isDirty() || draft == null) return false;
+    if (this.props.canSave) {
+      return this.props.canSave(draft, this.getSavedValue());
+    }
+    return true;
+  }
+
+  handleStartEdit = (event) => {
+    event.stopPropagation();
+    this.setState({
+      editing: true,
+      draft: structuredClone(this.getSavedValue()),
+      error: null,
+    });
+  };
+
+  handleCancel = (event) => {
+    event.stopPropagation();
+    this.setState({
+      editing: false,
+      draft: null,
+      error: null,
+    });
+  };
+
+  handleDraftChange = (nextDraft) => {
+    this.setState({ draft: nextDraft, error: null });
+  };
+
+  handleSave = async (event) => {
+    event.stopPropagation();
+    if (!this.canSave()) return;
+
+    const { onSave } = this.props;
+    const { draft } = this.state;
+    this.setState({ saving: true, error: null });
+
+    try {
+      await onSave(draft);
+      this.setState({ editing: false, draft: null, saving: false, error: null });
+      enqueueSnackbar('Gespeichert.', { variant: 'success' });
+    } catch (err) {
+      const normalized = backendErrorFrom(err);
+      this.setState({ saving: false, error: normalized.message });
+      enqueueSnackbar(normalized.message, { variant: 'error' });
+    }
+  };
+
+  renderTitle() {
+    const { title } = this.props;
+    const { editing } = this.state;
+    if (!title) return null;
+    return (
+      <Typography
+        variant="overline"
+        color="text.secondary"
+        sx={{ display: 'block', mb: 1, pr: editing ? 7 : 4 }}
+      >
+        {title}
+      </Typography>
+    );
+  }
+
+  renderActions() {
+    const { onSave } = this.props;
+    if (!onSave) return null;
+
+    const { editing, saving } = this.state;
+    const actionSx = {
+      position: 'absolute',
+      top: 4,
+      color: 'text.secondary',
+    };
+
+    if (!editing) {
+      return (
+        <IconButton
+          size="small"
+          onClick={this.handleStartEdit}
+          aria-label="Bearbeiten"
+          sx={{ ...actionSx, right: 4 }}
+        >
+          <EditOutlinedIcon fontSize="small" />
+        </IconButton>
+      );
+    }
+
+    return (
+      <>
+        <IconButton
+          size="small"
+          onClick={this.handleCancel}
+          disabled={saving}
+          aria-label="Abbrechen"
+          sx={{ ...actionSx, right: 40 }}
+        >
+          <CloseOutlinedIcon fontSize="small" />
+        </IconButton>
+        <IconButton
+          size="small"
+          onClick={this.handleSave}
+          disabled={!this.canSave()}
+          aria-label="Speichern"
+          color={this.canSave() ? 'primary' : 'default'}
+          sx={{ ...actionSx, right: 4 }}
+        >
+          {saving ? (
+            <CircularProgress size={18} color="inherit" />
+          ) : (
+            <SaveOutlinedIcon fontSize="small" />
+          )}
+        </IconButton>
+      </>
+    );
+  }
+
+  render() {
+    const {
+      wide = 1,
+      sx,
+      minHeight = 120,
+      renderDisplay,
+      renderEdit,
+    } = this.props;
+    const { editing, draft, error } = this.state;
+    const savedValue = this.getSavedValue();
+    const pending = this.isDirty();
+
+    return (
+      <Paper
+        variant="outlined"
+        sx={panelTilePaperSx({ wide, sx, minHeight, pending })}
+      >
+        {this.renderActions()}
+        {this.renderTitle()}
+        <Box sx={{ flex: 1, minWidth: 0, pr: editing ? 1 : 0 }}>
+          {editing && draft != null
+            ? renderEdit(draft, this.handleDraftChange, this.inputRef)
+            : renderDisplay(savedValue)}
+        </Box>
+        {error ? (
+          <Alert severity="error" sx={{ mt: 1, py: 0 }}>
+            {error}
+          </Alert>
+        ) : null}
+      </Paper>
+    );
+  }
+}

src/components/panels/PanelTile.jsx

@@ -0,0 +1,56 @@
+import { Component } from 'react';
+import Box from '@mui/material/Box';
+import Paper from '@mui/material/Paper';
+import Typography from '@mui/material/Typography';
+import { GRID_COLUMNS, panelTilePaperSx } from './panelTileLayout';
+
+export class PanelTile extends Component {
+  renderTitle() {
+    const { title } = this.props;
+    if (!title) return null;
+    return (
+      <Typography
+        variant="overline"
+        color="text.secondary"
+        sx={{ display: 'block', mb: 1 }}
+      >
+        {title}
+      </Typography>
+    );
+  }
+
+  render() {
+    const { wide = 1, children, sx, minHeight = 120 } = this.props;
+
+    return (
+      <Paper
+        variant="outlined"
+        sx={panelTilePaperSx({ wide, sx, minHeight })}
+      >
+        {this.renderTitle()}
+        <Box sx={{ flex: 1, minWidth: 0 }}>{children}</Box>
+      </Paper>
+    );
+  }
+}
+
+export function PanelTileGrid({ children, sx }) {
+  return (
+    <Box
+      sx={{
+        display: 'grid',
+        gridTemplateColumns: {
+          xs: '1fr',
+          sm: 'repeat(2, 1fr)',
+          md: `repeat(${GRID_COLUMNS}, 1fr)`,
+        },
+        gap: 2,
+        ...sx,
+      }}
+    >
+      {children}
+    </Box>
+  );
+}
+
+export { GRID_COLUMNS };

src/components/panels/index.js

@@ -0,0 +1,3 @@
+export { PanelTile, PanelTileGrid, GRID_COLUMNS } from './PanelTile';
+export { EditablePanelTile } from './EditablePanelTile';
+export { PENDING_EDIT_BORDER } from './panelTileLayout';

src/components/panels/panelTileLayout.js

@@ -0,0 +1,37 @@
+const GRID_COLUMNS = 4;
+
+export const PENDING_EDIT_BORDER = '#ec4899';
+
+function clampWide(wide) {
+  return Math.min(Math.max(wide, 1), 3);
+}
+
+export function responsiveColumnSpan(wide) {
+  const span = clampWide(wide);
+  return {
+    xs: '1 / -1',
+    sm: span >= 2 ? 'span 2' : 'span 1',
+    md: `span ${span}`,
+  };
+}
+
+export const PENDING_EDIT_RING_PX = 4;
+
+export function panelTilePaperSx({ wide, sx, minHeight = 120, pending = false }) {
+  return {
+    gridColumn: responsiveColumnSpan(wide),
+    position: 'relative',
+    p: 2,
+    minHeight,
+    display: 'flex',
+    flexDirection: 'column',
+    ...(pending
+      ? {
+          boxShadow: `inset 0 0 0 ${PENDING_EDIT_RING_PX}px ${PENDING_EDIT_BORDER}`,
+        }
+      : {}),
+    ...sx,
+  };
+}
+
+export { GRID_COLUMNS };

src/components/tiles/ArticleTile.jsx

@@ -2,6 +2,7 @@ import Inventory2OutlinedIcon from '@mui/icons-material/Inventory2Outlined';
 import Typography from '@mui/material/Typography';
 import { Tile } from './Tile';
 import { formatPrice } from '../../utils/price';
+import { articleSku } from '../../pages/artikel/articleRoute';
 
 export class ArticleTile extends Tile {
   renderIcon() {
@@ -11,14 +12,17 @@ export class ArticleTile extends Tile {
   renderSecondary() {
     const { article } = this.props;
     if (!article) return null;
+    const sku = articleSku(article);
     return (
       <>
-        <Typography variant="caption" color="text.secondary" noWrap sx={{ maxWidth: '100%' }}>
-          {article.sku}
-        </Typography>
-        {article.price != null && (
+        {sku ? (
+          <Typography variant="caption" color="text.secondary" noWrap sx={{ maxWidth: '100%' }}>
+            {sku}
+          </Typography>
+        ) : null}
+        {article.net != null && (
           <Typography variant="caption" fontWeight={600}>
-            {formatPrice(article.price)}
+            {formatPrice(article.net)}
           </Typography>
         )}
       </>

src/components/tiles/Tile.jsx

@@ -1,5 +1,5 @@
 import { Component } from 'react';
-import Paper from '@mui/material/Paper';
+import ButtonBase from '@mui/material/ButtonBase';
 import Typography from '@mui/material/Typography';
 
 export const TILE_SIZE = 140;
@@ -55,8 +55,7 @@ export class Tile extends Component {
   render() {
     const { sx, disabled } = this.props;
     return (
-      <Paper
-        variant="outlined"
+      <ButtonBase
         component="button"
         type="button"
         disabled={disabled}
@@ -66,6 +65,8 @@ export class Tile extends Component {
           border: '1px solid',
           borderColor: 'divider',
           bgcolor: 'background.paper',
+          borderRadius: 1,
+          overflow: 'hidden',
           ...(disabled
             ? { opacity: 0.5, pointerEvents: 'none' }
             : {}),
@@ -75,7 +76,7 @@ export class Tile extends Component {
         {this.renderIcon()}
         {this.renderLabel()}
         {this.renderSecondary()}
-      </Paper>
+      </ButtonBase>
     );
   }
 }

src/pages/artikel/RedirectArtikelKategorien.jsx

@@ -0,0 +1,8 @@
+import { Navigate, useParams } from 'react-router-dom';
+import { KATEGORIEN_BASE } from './categoryRoute';
+
+export default function RedirectArtikelKategorien() {
+  const { '*': rest = '' } = useParams();
+  const suffix = rest ? `/${rest}` : '';
+  return <Navigate to={`${KATEGORIEN_BASE}${suffix}`} replace />;
+}

src/pages/artikel/articleRoute.js

@@ -0,0 +1,11 @@
+export function articleSku(article) {
+  if (!article) return null;
+  const sku = article.sku?.trim();
+  return sku || null;
+}
+
+export function artikelDetailPath(article) {
+  const sku = articleSku(article);
+  if (!sku) return null;
+  return `/artikel/${encodeURIComponent(sku)}`;
+}

src/pages/artikel/categoryRoute.js

@@ -0,0 +1,67 @@
+import {
+  ROOT_CATEGORY_NAME,
+  categorySlug,
+  getCategoryBreadcrumbs,
+  getCategoryChildren,
+} from '../../store/categorySlice';
+
+export { ROOT_CATEGORY_NAME, categorySlug };
+
+export const KATEGORIEN_BASE = '/kategorien';
+
+export function isKategorienPath(pathname) {
+  return pathname === KATEGORIEN_BASE || pathname.startsWith(`${KATEGORIEN_BASE}/`);
+}
+
+function isRootSlug(slug) {
+  return slug === ROOT_CATEGORY_NAME;
+}
+
+export function categoryPathFromCrumbs(crumbs) {
+  const segments = (crumbs ?? [])
+    .filter((crumb) => crumb.slug && !isRootSlug(crumb.slug))
+    .map((crumb) => encodeURIComponent(crumb.slug));
+  if (segments.length === 0) {
+    return KATEGORIEN_BASE;
+  }
+  return `${KATEGORIEN_BASE}/${segments.join('/')}`;
+}
+
+export function buildCategoryPath(categories, rootCategoryId, categoryId) {
+  const crumbs = getCategoryBreadcrumbs(categories, categoryId, rootCategoryId);
+  return categoryPathFromCrumbs(crumbs);
+}
+
+export function resolveCategoryIdFromSlugPath(categories, rootCategoryId, slugPath) {
+  if (!categories || rootCategoryId == null) return null;
+
+  let segments = (slugPath ?? '')
+    .split('/')
+    .filter(Boolean)
+    .map((segment) => decodeURIComponent(segment));
+
+  // Legacy slug URLs: .../Home/...
+  if (segments[0] === ROOT_CATEGORY_NAME) {
+    segments = segments.slice(1);
+  }
+
+  if (segments.length === 0) {
+    return rootCategoryId;
+  }
+
+  let currentId = rootCategoryId;
+  for (const slug of segments) {
+    const children = getCategoryChildren(categories, currentId);
+    const match = children.find(
+      (child) => categorySlug(child.name, child.id, rootCategoryId) === slug,
+    );
+    if (!match) return null;
+    currentId = match.id;
+  }
+
+  return currentId;
+}
+
+export function defaultCategoryPath() {
+  return KATEGORIEN_BASE;
+}

src/pages/artikel/kategorien.jsx

@@ -4,28 +4,36 @@ import Box from '@mui/material/Box';
 import CircularProgress from '@mui/material/CircularProgress';
 import Typography from '@mui/material/Typography';
 import BackendError from '../../components/BackendError';
+import { NewCategoryTile, CategoryBreadcrumbs } from '../../components/category';
+import { NewArticleTile } from '../../components/article';
 import {
-  ActionTile,
   ArticleTile,
   BackTile,
   CategoryTile,
   TILE_SIZE,
 } from '../../components/tiles';
-import withNavigate from '../../components/withNavigate';
+import withCategoryRoute from './withCategoryRoute';
+import { artikelDetailPath, articleSku } from './articleRoute';
 import { selectCompanyId } from '../../store/companySlice';
+import {
+  buildCategoryPath,
+  defaultCategoryPath,
+  resolveCategoryIdFromSlugPath,
+  ROOT_CATEGORY_NAME,
+} from './categoryRoute';
 import {
   categoryDisplayName,
   loadCategoryArticles,
   loadCategoryTree,
-  navigateBack,
   navigateToCategory,
   selectCanNavigateBack,
   selectCategoryArticles,
   selectCategoryArticlesStatus,
+  selectCategoryBreadcrumbs,
+  selectCategoryMap,
   selectCategoryError,
   selectCategoryTreeStatus,
   selectChildCategories,
-  selectCurrentCategory,
 } from '../../store/categorySlice';
 
 const gridSx = {
@@ -37,6 +45,7 @@ const gridSx = {
 class ArtikelKategorienPage extends Component {
   componentDidMount() {
     this.ensureTreeLoaded();
+    this.syncCategoryFromUrl();
     this.ensureArticlesLoaded();
   }
 
@@ -44,13 +53,23 @@ class ArtikelKategorienPage extends Component {
     if (this.props.companyId !== prevProps.companyId) {
       this.ensureTreeLoaded();
     }
-    if (this.props.currentCategoryId !== prevProps.currentCategoryId) {
-      this.ensureArticlesLoaded();
-    }
+
     if (
       this.props.treeStatus === 'succeeded' &&
       prevProps.treeStatus !== 'succeeded'
     ) {
+      this.syncCategoryFromUrl();
+      this.ensureArticlesLoaded();
+    }
+
+    if (
+      this.props.treeStatus === 'succeeded' &&
+      this.props.categorySlugPath !== prevProps.categorySlugPath
+    ) {
+      this.syncCategoryFromUrl();
+    }
+
+    if (this.props.currentCategoryId !== prevProps.currentCategoryId) {
       this.ensureArticlesLoaded();
     }
   }
@@ -58,35 +77,76 @@ class ArtikelKategorienPage extends Component {
   ensureTreeLoaded = () => {
     const { companyId, treeStatus } = this.props;
     if (!companyId || treeStatus !== 'idle') return;
-    this.props.loadCategoryTree(companyId);
+    this.props.loadCategoryTree();
   };
 
   ensureArticlesLoaded = () => {
-    const { currentCategoryId, articlesStatus, rootCategoryId } = this.props;
-    if (!currentCategoryId || articlesStatus !== 'idle') return;
-    // Root articles come from tree response; only fetch for subcategories.
+    const { currentCategoryId, articlesStatus, rootCategoryId, treeStatus } = this.props;
+    if (treeStatus !== 'succeeded' || !currentCategoryId || articlesStatus !== 'idle') return;
     if (String(currentCategoryId) === String(rootCategoryId)) return;
-    this.props.loadCategoryArticles({ categoryId: currentCategoryId });
+    this.props.loadCategoryArticles(currentCategoryId);
+  };
+
+  syncCategoryFromUrl = () => {
+    const {
+      categories,
+      rootCategoryId,
+      categorySlugPath,
+      currentCategoryId,
+      treeStatus,
+      navigate,
+    } = this.props;
+
+    if (treeStatus !== 'succeeded' || !categories || rootCategoryId == null) return;
+
+    const segments = (categorySlugPath ?? '').split('/').filter(Boolean);
+    const hasLegacyHomePrefix = segments[0] === ROOT_CATEGORY_NAME;
+
+    const resolvedId = resolveCategoryIdFromSlugPath(
+      categories,
+      rootCategoryId,
+      categorySlugPath,
+    );
+
+    if (resolvedId == null) {
+      navigate(defaultCategoryPath(), { replace: true });
+      return;
+    }
+
+    if (hasLegacyHomePrefix) {
+      navigate(buildCategoryPath(categories, rootCategoryId, resolvedId), { replace: true });
+    }
+
+    if (resolvedId !== currentCategoryId) {
+      this.props.navigateToCategory(resolvedId);
+    }
+  };
+
+  navigateToCategoryById = (categoryId) => {
+    const { categories, rootCategoryId, navigate } = this.props;
+    navigate(buildCategoryPath(categories, rootCategoryId, categoryId));
   };
 
   handleRetryTree = () => {
-    const { companyId } = this.props;
-    if (companyId) this.props.loadCategoryTree(companyId);
+    if (this.props.companyId) this.props.loadCategoryTree();
   };
 
   handleRetryArticles = () => {
     const { currentCategoryId } = this.props;
     if (currentCategoryId) {
-      this.props.loadCategoryArticles({ categoryId: currentCategoryId });
+      this.props.loadCategoryArticles(currentCategoryId);
     }
   };
 
-  handleCategoryClick = (categoryId) => {
-    this.props.navigateToCategory(categoryId);
+  handleNavigateBack = () => {
+    const { breadcrumbs } = this.props;
+    if (breadcrumbs.length < 2) return;
+    this.navigateToCategoryById(breadcrumbs[breadcrumbs.length - 2].id);
   };
 
-  handleArticleClick = (sku) => {
-    this.props.navigate(`/artikel/${encodeURIComponent(sku)}`);
+  handleArticleClick = (article) => {
+    const path = artikelDetailPath(article);
+    if (path) this.props.navigate(path);
   };
 
   render() {
@@ -97,7 +157,7 @@ class ArtikelKategorienPage extends Component {
       articlesStatus,
       error,
       canGoBack,
-      currentCategory,
+      breadcrumbs,
       currentCategoryId,
       childCategories,
       articles,
@@ -128,28 +188,22 @@ class ArtikelKategorienPage extends Component {
       );
     }
 
-    if (!rootCategoryId) {
+    if (rootCategoryId == null) {
       return (
-        <Typography color="text.secondary">
-          Kategoriebaum ist leer.
+        <Typography color="error">
+          rootCategoryId fehlt.
         </Typography>
       );
     }
 
-    const categoryName = categoryDisplayName(
-      currentCategory?.name,
-      currentCategoryId,
-      rootCategoryId,
-    );
     const showArticlesLoading = articlesStatus === 'loading';
 
     return (
       <>
-        {categoryName ? (
-          <Typography variant="subtitle1" sx={{ mb: 2, fontWeight: 600 }}>
-            {categoryName}
-          </Typography>
-        ) : null}
+        <CategoryBreadcrumbs
+          crumbs={breadcrumbs}
+          onNavigate={this.navigateToCategoryById}
+        />
 
         {error && articlesStatus === 'failed' && (
           <BackendError
@@ -161,35 +215,31 @@ class ArtikelKategorienPage extends Component {
 
         <Box sx={gridSx}>
           {canGoBack && (
-            <BackTile onClick={this.props.navigateBack} />
+            <BackTile onClick={this.handleNavigateBack} />
           )}
 
           {childCategories.map((item) => (
             <CategoryTile
               key={item.id}
               label={categoryDisplayName(item.name, item.id, rootCategoryId)}
-              onClick={() => this.handleCategoryClick(item.id)}
+              onClick={() => this.navigateToCategoryById(item.id)}
             />
           ))}
 
           {articles.map((item) => (
             <ArticleTile
-              key={item.id ?? item.sku}
-              label={item.name?.trim() || undefined}
+              key={item.id}
+              label={item.name != null ? item.name.trim() : undefined}
               article={item}
-              onClick={() => this.handleArticleClick(item.sku)}
+              disabled={!articleSku(item)}
+              onClick={() => this.handleArticleClick(item)}
             />
           ))}
 
-          <ActionTile
-            label="Neue Kategorie"
-            disabled
-            onClick={() => {}}
-          />
-          <ActionTile
-            label="Neuer Artikel"
-            disabled
-            onClick={() => {}}
+          <NewCategoryTile parentId={currentCategoryId} />
+          <NewArticleTile
+            parentId={currentCategoryId}
+            onOpenArticle={this.handleArticleClick}
           />
         </Box>
 
@@ -198,7 +248,6 @@ class ArtikelKategorienPage extends Component {
             <CircularProgress size={28} />
           </Box>
         )}
-
       </>
     );
   }
@@ -206,12 +255,13 @@ class ArtikelKategorienPage extends Component {
 
 const mapStateToProps = (state) => ({
   companyId: selectCompanyId(state),
+  categories: selectCategoryMap(state),
   rootCategoryId: state.category.rootCategoryId,
   treeStatus: selectCategoryTreeStatus(state),
   articlesStatus: selectCategoryArticlesStatus(state),
   error: selectCategoryError(state),
   currentCategoryId: state.category.currentCategoryId,
-  currentCategory: selectCurrentCategory(state),
+  breadcrumbs: selectCategoryBreadcrumbs(state),
   childCategories: selectChildCategories(state),
   articles: selectCategoryArticles(state),
   canGoBack: selectCanNavigateBack(state),
@@ -221,7 +271,6 @@ const mapDispatchToProps = {
   loadCategoryTree,
   loadCategoryArticles,
   navigateToCategory,
-  navigateBack,
 };
 
-export default withNavigate(connect(mapStateToProps, mapDispatchToProps)(ArtikelKategorienPage));
+export default withCategoryRoute(connect(mapStateToProps, mapDispatchToProps)(ArtikelKategorienPage));

src/pages/artikel/sku.jsx

@@ -1,276 +1,18 @@
 import { useCallback, useEffect, useState } from 'react';
-import { Link as RouterLink, useNavigate, useParams } from 'react-router-dom';
+import { useNavigate, useParams } from 'react-router-dom';
 import Alert from '@mui/material/Alert';
 import Box from '@mui/material/Box';
-import Chip from '@mui/material/Chip';
 import CircularProgress from '@mui/material/CircularProgress';
-import Link from '@mui/material/Link';
-import Paper from '@mui/material/Paper';
-import Table from '@mui/material/Table';
-import TableBody from '@mui/material/TableBody';
-import TableCell from '@mui/material/TableCell';
-import TableHead from '@mui/material/TableHead';
-import TableRow from '@mui/material/TableRow';
-import Typography from '@mui/material/Typography';
 import { article } from '../../api';
+import { ArticleView } from '../../components/article';
 import BackendError from '../../components/BackendError';
+import { requireObject } from '../../utils/apiShape';
 import { backendErrorFrom, isBackendFailure } from '../../utils/backendError';
-import { formatPrice, getBrutto } from '../../utils/price';
-import { formatStock } from './searchFormat';
-
-function DetailRow({ label, children }) {
-  if (children == null || children === '') return null;
-  return (
-    <Box sx={{ display: 'grid', gridTemplateColumns: '160px 1fr', gap: 1, py: 0.75 }}>
-      <Typography variant="body2" color="text.secondary">
-        {label}
-      </Typography>
-      <Typography variant="body2" component="div">
-        {children}
-      </Typography>
-    </Box>
-  );
-}
-
-function Section({ title, children }) {
-  if (!children) return null;
-  return (
-    <Box sx={{ mt: 3 }}>
-      <Typography variant="subtitle1" sx={{ fontWeight: 600, mb: 1 }}>
-        {title}
-      </Typography>
-      {children}
-    </Box>
-  );
-}
-
-export function ArticleView({ article: a }) {
-  const brutto =
-    a.fVKNEtto != null ? getBrutto(a.fVKNEtto, a.kSteuerklasse) : null;
-
-  return (
-    <Box>
-      <Box sx={{ display: 'flex', flexWrap: 'wrap', alignItems: 'center', gap: 1, mb: 2 }}>
-        <Typography variant="h6" sx={{ fontWeight: 700, mr: 1 }}>
-          {a.cName}
-        </Typography>
-        <Chip
-          size="small"
-          label={a.cAktiv === 'Y' ? 'Aktiv' : 'Inaktiv'}
-          color={a.cAktiv === 'Y' ? 'success' : 'default'}
-          variant="outlined"
-        />
-      </Box>
-
-      <Paper variant="outlined" sx={{ p: 2 }}>
-        <DetailRow label="Artikelnr.">{a.cArtNr}</DetailRow>
-        <DetailRow label="Barcode">{a.cBarcode}</DetailRow>
-        <DetailRow label="Hersteller">{a.cHersteller}</DetailRow>
-        <DetailRow label="VK Netto">
-          {a.fVKNEtto != null ? formatPrice(a.fVKNEtto) : null}
-        </DetailRow>
-        <DetailRow label="VK Brutto">
-          {brutto != null ? formatPrice(brutto) : null}
-        </DetailRow>
-        <DetailRow label="UVP">{a.fUVP != null ? formatPrice(a.fUVP) : null}</DetailRow>
-        <DetailRow label="Bestand">{formatStock(a.fBestand)}</DetailRow>
-        <DetailRow label="Garage">{a.garage != null ? formatStock(a.garage) : null}</DetailRow>
-        <DetailRow label="Keller">{a.keller != null ? formatStock(a.keller) : null}</DetailRow>
-        <DetailRow label="Versandklasse">{a.tVersandklassecName}</DetailRow>
-        <DetailRow label="Gewicht">
-          {a.fGewicht != null
-            ? `${new Intl.NumberFormat('de-DE').format(a.fGewicht)} kg`
-            : null}
-        </DetailRow>
-        {a.vater?.cArtNr && (
-          <DetailRow label="Vaterartikel">
-            <Link component={RouterLink} to={`/artikel/${encodeURIComponent(a.vater.cArtNr)}`}>
-              {a.vater.cArtNr}
-            </Link>
-          </DetailRow>
-        )}
-        {(a.cEigenschaftName || a.cEigenschaftWertName) && (
-          <DetailRow label="Variante">
-            {[a.cEigenschaftName, a.cEigenschaftWertName].filter(Boolean).join(': ')}
-          </DetailRow>
-        )}
-      </Paper>
-
-      {a.cKurzBeschreibung && (
-        <Section title="Kurzbeschreibung">
-          <Typography variant="body2">{a.cKurzBeschreibung}</Typography>
-        </Section>
-      )}
-
-      {a.cBeschreibung && (
-        <Section title="Beschreibung">
-          <Box
-            sx={{ typography: 'body2', '& p': { mt: 0 } }}
-            dangerouslySetInnerHTML={{ __html: a.cBeschreibung }}
-          />
-        </Section>
-      )}
-
-      {a.EANs?.length > 0 && (
-        <Section title="EANs">
-          <Typography variant="body2">
-            {a.EANs.map((row) => row.cEAN).filter(Boolean).join(', ')}
-          </Typography>
-        </Section>
-      )}
-
-      {a.KATs?.length > 0 && (
-        <Section title="Kategorien">
-          <Typography variant="body2">
-            {a.KATs.map((row) => row.kKategorie).join(', ')}
-          </Typography>
-        </Section>
-      )}
-
-      {a.staffel?.length > 0 && (
-        <Section title="Staffelpreise">
-          <Table size="small">
-            <TableHead>
-              <TableRow>
-                <TableCell>Menge</TableCell>
-                <TableCell align="right">VK Brutto</TableCell>
-              </TableRow>
-            </TableHead>
-            <TableBody>
-              {a.staffel.map((row, i) => (
-                <TableRow key={i}>
-                  <TableCell>{row.menge}</TableCell>
-                  <TableCell align="right">{row.fVKBrutto}</TableCell>
-                </TableRow>
-              ))}
-            </TableBody>
-          </Table>
-        </Section>
-      )}
-
-      {a.lief?.length > 0 && (
-        <Section title="Lieferanten">
-          <Table size="small">
-            <TableHead>
-              <TableRow>
-                <TableCell>Firma</TableCell>
-                <TableCell>Lief.-Artikelnr.</TableCell>
-                <TableCell align="right">EK Netto</TableCell>
-                <TableCell align="right">Lager</TableCell>
-              </TableRow>
-            </TableHead>
-            <TableBody>
-              {a.lief.map((row, i) => (
-                <TableRow key={i}>
-                  <TableCell>
-                    {row.cFirma}
-                    {row.nStandard ? ' ★' : ''}
-                  </TableCell>
-                  <TableCell>{row.cLiefArtNr || '—'}</TableCell>
-                  <TableCell align="right">
-                    {row.fEKNetto != null ? formatPrice(row.fEKNetto) : '—'}
-                  </TableCell>
-                  <TableCell align="right">{formatStock(row.fLagerbestand)}</TableCell>
-                </TableRow>
-              ))}
-            </TableBody>
-          </Table>
-        </Section>
-      )}
-
-      {a.merkmale?.length > 0 && (
-        <Section title="Merkmale">
-          <Paper variant="outlined" sx={{ p: 2 }}>
-            {a.merkmale.map((row, i) => (
-              <DetailRow key={i} label={row.cName}>
-                {row.cWert}
-              </DetailRow>
-            ))}
-          </Paper>
-        </Section>
-      )}
-
-      {a.children?.length > 0 && (
-        <Section title="Varianten">
-          <Table size="small">
-            <TableHead>
-              <TableRow>
-                <TableCell>Artikelnr.</TableCell>
-                <TableCell>Name</TableCell>
-              </TableRow>
-            </TableHead>
-            <TableBody>
-              {a.children.map((row) => (
-                <TableRow key={row.cArtNr || row.kArtikel} hover>
-                  <TableCell>
-                    {row.cArtNr ? (
-                      <Link
-                        component={RouterLink}
-                        to={`/artikel/${encodeURIComponent(row.cArtNr)}`}
-                      >
-                        {row.cArtNr}
-                      </Link>
-                    ) : (
-                      '—'
-                    )}
-                  </TableCell>
-                  <TableCell>{row.cName || '—'}</TableCell>
-                </TableRow>
-              ))}
-            </TableBody>
-          </Table>
-        </Section>
-      )}
-
-      {a.liste?.length > 0 && (
-        <Section title="Stückliste">
-          <Table size="small">
-            <TableHead>
-              <TableRow>
-                <TableCell>Artikelnr.</TableCell>
-                <TableCell>Name</TableCell>
-                <TableCell align="right">Menge</TableCell>
-              </TableRow>
-            </TableHead>
-            <TableBody>
-              {a.liste.map((row, i) => (
-                <TableRow key={i}>
-                  <TableCell>
-                    {row.cArtNr ? (
-                      <Link
-                        component={RouterLink}
-                        to={`/artikel/${encodeURIComponent(row.cArtNr)}`}
-                      >
-                        {row.cArtNr}
-                      </Link>
-                    ) : (
-                      '—'
-                    )}
-                  </TableCell>
-                  <TableCell>{row.cName || '—'}</TableCell>
-                  <TableCell align="right">{formatStock(row.fAnzahl ?? row.menge)}</TableCell>
-                </TableRow>
-              ))}
-            </TableBody>
-          </Table>
-        </Section>
-      )}
-
-      {a.cAnmerkung && (
-        <Section title="Interne Anmerkung">
-          <Typography variant="body2" sx={{ whiteSpace: 'pre-wrap' }}>
-            {a.cAnmerkung}
-          </Typography>
-        </Section>
-      )}
-    </Box>
-  );
-}
 
 export default function ArtikelSkuPage() {
-  const { sku } = useParams();
+  const { sku: skuParam } = useParams();
   const navigate = useNavigate();
-  const target = sku ? decodeURIComponent(sku) : '';
+  const sku = skuParam ? decodeURIComponent(skuParam) : '';
   const [data, setData] = useState(null);
   const [error, setError] = useState(null);
   const [loading, setLoading] = useState(true);
@@ -295,7 +37,7 @@ export default function ArtikelSkuPage() {
     let cancelled = false;
 
     async function load() {
-      if (!target) {
+      if (!sku) {
         setError('Keine Artikelnr. angegeben');
         setData(null);
         setLoading(false);
@@ -305,10 +47,11 @@ export default function ArtikelSkuPage() {
       setLoading(true);
       setError(null);
       try {
-        const res = await article.get({ target });
+        const res = await article.getBySku(sku);
+        requireObject(res, 'GET /api/article/:sku');
+        requireObject(res.article, 'article');
         if (!cancelled) {
-          setData(res.article ?? null);
-          if (!res.article) setError('Artikel nicht gefunden');
+          setData(res.article);
         }
       } catch (err) {
         if (!cancelled) {
@@ -324,7 +67,7 @@ export default function ArtikelSkuPage() {
     return () => {
       cancelled = true;
     };
-  }, [target, reloadKey]);
+  }, [sku, reloadKey]);
 
   if (loading) {
     return (
@@ -352,5 +95,5 @@ export default function ArtikelSkuPage() {
 
   if (!data) return null;
 
-  return <ArticleView article={data} />;
+  return <ArticleView article={data} onArticleUpdated={setData} />;
 }

src/pages/artikel/withCategoryRoute.jsx

@@ -0,0 +1,19 @@
+import { useLocation, useNavigate, useParams } from 'react-router-dom';
+
+export default function withCategoryRoute(Wrapped) {
+  function CategoryRouteWrapper(props) {
+    const navigate = useNavigate();
+    const location = useLocation();
+    const { '*': categorySlugPath = '' } = useParams();
+
+    return (
+      <Wrapped
+        {...props}
+        navigate={navigate}
+        location={location}
+        categorySlugPath={categorySlugPath}
+      />
+    );
+  }
+  return CategoryRouteWrapper;
+}

src/store/categorySlice.js

@@ -1,5 +1,6 @@
 import { createAsyncThunk, createSlice } from '@reduxjs/toolkit';
-import { article, category } from '../api';
+import { category, article } from '../api';
+import { requireArray, requireDefined, requireObject } from '../utils/apiShape';
 import { catchBackendError, resolveBackendError } from '../utils/backendError';
 import { logout } from './authSlice';
 import { loadCurrentCompany } from './companySlice';
@@ -7,28 +8,35 @@ import { loadCurrentCompany } from './companySlice';
 export const ROOT_CATEGORY_NAME = 'Home';
 
 export function normalizeCategoryNode(item) {
+  requireObject(item, 'category');
+  requireDefined(item.id, 'category.id');
   return {
     ...item,
     id: item.id,
-    parentId: item.parentId ?? 0,
-    name: item.name?.trim() || null,
+    parentId: item.parentId,
+    name: item.name == null ? null : String(item.name).trim() || null,
   };
 }
 
-/** Backend: { tree: { tree: [...], articles: [] } } */
-export function parseCategoryTreeResponse(data, companyRootCategoryId = null) {
-  const payload = data?.tree ?? data;
-  const rawNodes = payload?.tree ?? payload?.categories ?? data?.categories ?? [];
-  const list = Array.isArray(rawNodes) ? rawNodes : Object.values(rawNodes);
+/** Backend: { languageId, tree: [...], articles: [] } — rootCategoryId aus Company */
+export function parseCategoryTreeResponse(data, companyRootCategoryId) {
+  requireObject(data, 'category/tree');
+  const list = requireArray(data.tree, 'category/tree.tree');
+  requireArray(data.articles, 'category/tree.articles');
+
+  const rootCategoryId = data.rootCategoryId != null ? data.rootCategoryId : companyRootCategoryId;
+  requireDefined(rootCategoryId, 'rootCategoryId');
 
   const categories = Object.fromEntries(
     list.map((item) => [String(item.id), normalizeCategoryNode(item)]),
   );
 
-  const rootCategoryId = data?.rootCategoryId ?? companyRootCategoryId ?? null;
-  const rootArticles = Array.isArray(payload?.articles) ? payload.articles : [];
-
-  return { rootCategoryId, categories, rootArticles };
+  return {
+    rootCategoryId,
+    categories,
+    rootArticles: data.articles,
+    languageId: data.languageId,
+  };
 }
 
 export function categoryDisplayName(name, categoryId, rootCategoryId) {
@@ -38,33 +46,65 @@ export function categoryDisplayName(name, categoryId, rootCategoryId) {
   return name?.trim() || '';
 }
 
-export function normalizeCategoryMap(data) {
-  return parseCategoryTreeResponse(data).categories;
+export function categorySlug(name, categoryId, rootCategoryId) {
+  if (rootCategoryId != null && String(categoryId) === String(rootCategoryId)) {
+    return ROOT_CATEGORY_NAME;
+  }
+  const trimmed = name?.trim();
+  return trimmed || null;
+}
+
+export function normalizeCategoryMap(data, companyRootCategoryId) {
+  return parseCategoryTreeResponse(data, companyRootCategoryId).categories;
 }
 
 export function getCategoryChildren(categories, parentId) {
   if (!categories) return [];
   const parentKey = String(parentId);
   return Object.values(categories)
-    .filter((item) => String(item.parentId ?? 0) === parentKey)
+    .filter((item) => item.parentId != null && String(item.parentId) === parentKey)
     .sort((a, b) => (a.sort ?? 0) - (b.sort ?? 0) || a.id - b.id);
 }
 
+export function getCategoryBreadcrumbs(categories, currentCategoryId, rootCategoryId) {
+  if (!categories || currentCategoryId == null) return [];
+
+  const crumbs = [];
+  const seen = new Set();
+  let id = currentCategoryId;
+
+  while (id != null && !seen.has(String(id))) {
+    seen.add(String(id));
+    const node = categories[String(id)];
+    if (!node) break;
+
+    crumbs.unshift({
+      id: node.id,
+      name: categoryDisplayName(node.name, node.id, rootCategoryId),
+      slug: categorySlug(node.name, node.id, rootCategoryId),
+    });
+
+    const parentId = node.parentId;
+    if (parentId == null || parentId === 0) break;
+    if (String(parentId) === String(id)) break;
+    id = parentId;
+  }
+
+  return crumbs;
+}
+
 export const loadCategoryTree = createAsyncThunk(
   'category/loadTree',
-  async (companyId, { rejectWithValue, getState }) => {
+  async (_, { rejectWithValue, getState }) => {
     try {
-      const data = await category.getTree({ companyId });
-      const fallbackRootId = getState().company.current?.rootCategoryId ?? null;
-      const { rootCategoryId, categories, rootArticles } = parseCategoryTreeResponse(
-        data,
-        fallbackRootId,
-      );
+      const companyId = getState().company.current?.id;
+      const companyRootId = getState().company.current?.rootCategoryId;
+      requireDefined(companyRootId, 'company.rootCategoryId');
+      const data = await category.getTree();
+      const parsed = parseCategoryTreeResponse(data, companyRootId);
       return {
         companyId,
-        rootCategoryId,
-        categories,
-        rootArticles,
+        ...parsed,
       };
     } catch (err) {
       return catchBackendError(rejectWithValue)(err);
@@ -74,14 +114,51 @@ export const loadCategoryTree = createAsyncThunk(
 
 export const loadCategoryArticles = createAsyncThunk(
   'category/loadArticles',
-  async ({ categoryId, offset = 0, maxCount = 200 } = {}, { rejectWithValue }) => {
+  async (categoryId, { rejectWithValue }) => {
     try {
-      const data = await article.byCategory({ categoryId, offset, maxCount });
-      return {
-        categoryId,
-        recordset: data.recordset ?? [],
-        length: data.length ?? data.recordset?.length ?? 0,
-      };
+      const data = await category.getArticles(categoryId);
+      requireObject(data, `category/${categoryId}/articles`);
+      const articles = requireArray(data.articles, `category/${categoryId}/articles.articles`);
+      return { categoryId, articles };
+    } catch (err) {
+      return catchBackendError(rejectWithValue)(err);
+    }
+  },
+);
+
+export const createCategory = createAsyncThunk(
+  'category/create',
+  async ({ parentId, name }, { rejectWithValue }) => {
+    try {
+      const data = await category.create({ parentId, name });
+      requireObject(data.category, 'POST /api/category.category');
+      return normalizeCategoryNode(data.category);
+    } catch (err) {
+      return catchBackendError(rejectWithValue)(err);
+    }
+  },
+);
+
+export const createArticle = createAsyncThunk(
+  'category/createArticle',
+  async ({ parentId, name }, { rejectWithValue }) => {
+    try {
+      const data = await article.create({ parentId, name });
+      requireObject(data.article, 'POST /api/article.article');
+      requireDefined(data.article.id, 'article.id');
+      return data.article;
+    } catch (err) {
+      return catchBackendError(rejectWithValue)(err);
+    }
+  },
+);
+
+export const deleteCategory = createAsyncThunk(
+  'category/delete',
+  async (categoryId, { rejectWithValue }) => {
+    try {
+      await category.delete(categoryId);
+      return categoryId;
     } catch (err) {
       return catchBackendError(rejectWithValue)(err);
     }
@@ -90,6 +167,7 @@ export const loadCategoryArticles = createAsyncThunk(
 
 const initialState = {
   companyId: null,
+  languageId: null,
   categories: null,
   rootCategoryId: null,
   rootArticles: [],
@@ -107,10 +185,16 @@ const categorySlice = createSlice({
   reducers: {
     navigateToCategory(state, action) {
       state.currentCategoryId = action.payload;
-      state.articles = [];
-      state.articlesTotal = 0;
-      state.articlesStatus = 'idle';
       state.error = null;
+      if (String(action.payload) === String(state.rootCategoryId)) {
+        state.articles = state.rootArticles;
+        state.articlesTotal = state.rootArticles.length;
+        state.articlesStatus = 'succeeded';
+      } else {
+        state.articles = [];
+        state.articlesTotal = 0;
+        state.articlesStatus = 'idle';
+      }
     },
     navigateBack(state) {
       const current = state.categories?.[String(state.currentCategoryId)];
@@ -143,10 +227,11 @@ const categorySlice = createSlice({
       .addCase(loadCategoryTree.fulfilled, (state, action) => {
         state.treeStatus = 'succeeded';
         state.companyId = action.payload.companyId;
+        state.languageId = action.payload.languageId;
         state.categories = action.payload.categories;
         state.rootCategoryId = action.payload.rootCategoryId;
         state.currentCategoryId = action.payload.rootCategoryId;
-        state.rootArticles = action.payload.rootArticles ?? [];
+        state.rootArticles = action.payload.rootArticles;
         state.articles = state.rootArticles;
         state.articlesTotal = state.rootArticles.length;
         state.articlesStatus = 'succeeded';
@@ -161,8 +246,8 @@ const categorySlice = createSlice({
       })
       .addCase(loadCategoryArticles.fulfilled, (state, action) => {
         state.articlesStatus = 'succeeded';
-        state.articles = action.payload.recordset;
-        state.articlesTotal = action.payload.length;
+        state.articles = action.payload.articles;
+        state.articlesTotal = action.payload.articles.length;
       })
       .addCase(loadCategoryArticles.rejected, (state, action) => {
         state.articlesStatus = 'failed';
@@ -170,6 +255,32 @@ const categorySlice = createSlice({
         state.articlesTotal = 0;
         state.error = resolveBackendError(action);
       })
+      .addCase(createCategory.fulfilled, (state, action) => {
+        if (!state.categories) state.categories = {};
+        state.categories[String(action.payload.id)] = action.payload;
+      })
+      .addCase(createArticle.fulfilled, (state, action) => {
+        const created = action.payload;
+        if (created == null) return;
+        if (String(created.parentId) === String(state.currentCategoryId)) {
+          state.articles = [...state.articles, created];
+          state.articlesTotal = state.articles.length;
+          state.articlesStatus = 'succeeded';
+        }
+        if (String(created.parentId) === String(state.rootCategoryId)) {
+          state.rootArticles = [...state.rootArticles, created];
+        }
+      })
+      .addCase(deleteCategory.fulfilled, (state, action) => {
+        if (!state.categories) return;
+        delete state.categories[String(action.payload)];
+        if (String(state.currentCategoryId) === String(action.payload)) {
+          state.currentCategoryId = state.rootCategoryId;
+          state.articles = state.rootArticles;
+          state.articlesTotal = state.rootArticles.length;
+          state.articlesStatus = 'succeeded';
+        }
+      })
       .addCase(loadCurrentCompany.fulfilled, (state, action) => {
         const nextCompanyId = action.payload?.id ?? null;
         if (nextCompanyId != null && nextCompanyId !== state.companyId) {
@@ -206,6 +317,13 @@ export const selectCurrentCategory = (state) => {
 export const selectChildCategories = (state) =>
   getCategoryChildren(state.category.categories, state.category.currentCategoryId);
 
+export const selectCategoryBreadcrumbs = (state) =>
+  getCategoryBreadcrumbs(
+    state.category.categories,
+    state.category.currentCategoryId,
+    state.category.rootCategoryId,
+  );
+
 export const selectCanNavigateBack = (state) => {
   const { currentCategoryId, rootCategoryId, categories } = state.category;
   if (currentCategoryId == null || rootCategoryId == null) return false;

src/store/companySlice.js

@@ -78,8 +78,8 @@ export const selectCurrentCompany = (state) => state.company.current;
 export const selectCompanyId = (state) => state.company.current?.id ?? null;
 export const selectCompanyStatus = (state) => state.company.status;
 export const selectCompanyError = (state) => state.company.error;
-export const selectCompanyName = (state) => state.company.current?.name ?? '';
-export const selectCompanyIso639 = (state) => state.company.current?.iso639 ?? 'de';
+export const selectCompanyName = (state) => state.company.current?.name;
+export const selectCompanyIso639 = (state) => state.company.current?.iso639;
 export const selectCompanyTaxrate = (state) => state.company.current?.taxrate ?? null;
 export const selectCompanyReducedTaxrate = (state) => state.company.current?.reducedtaxrate ?? null;
 export const selectCompanyRootCategoryId = (state) => state.company.current?.rootCategoryId ?? null;

src/utils/apiShape.js

@@ -0,0 +1,20 @@
+export function requireObject(value, label) {
+  if (value == null || typeof value !== 'object' || Array.isArray(value)) {
+    throw new Error(`${label}: Objekt erwartet`);
+  }
+  return value;
+}
+
+export function requireArray(value, label) {
+  if (!Array.isArray(value)) {
+    throw new Error(`${label}: Array erwartet`);
+  }
+  return value;
+}
+
+export function requireDefined(value, label) {
+  if (value == null) {
+    throw new Error(`${label}: fehlt`);
+  }
+  return value;
+}

src/utils/companyForm.js

@@ -1,5 +1,6 @@
 export const ISO639_OPTIONS = ['de', 'en'];
 
+/** Default für leeres Anlege-Formular (Browser-Sprache), nicht für API-Parsing. */
 export function defaultIso639() {
   return navigator.language?.toLowerCase().startsWith('de') ? 'de' : 'en';
 }
@@ -10,21 +11,14 @@ export function parseTaxRate(value) {
   return Number.isFinite(parsed) && parsed >= 0 ? parsed : null;
 }
 
-/** Until backend returns iso639 on company objects. */
-export function companyLanguageToIso639(company) {
-  if (company?.iso639) return company.iso639;
-  if (company?.languageId === 2) return 'en';
-  return 'de';
-}
-
 export function normalizeCompany(raw, overrides = {}) {
   if (!raw) return null;
   return {
     id: raw.id,
-    name: overrides.name ?? raw.name ?? '',
-    iso639: overrides.iso639 ?? companyLanguageToIso639(raw),
-    taxrate: overrides.taxrate ?? raw.taxrate ?? null,
-    reducedtaxrate: overrides.reducedtaxrate ?? raw.reducedtaxrate ?? null,
-    rootCategoryId: overrides.rootCategoryId ?? raw.rootCategoryId ?? null,
+    name: overrides.name !== undefined ? overrides.name : raw.name,
+    iso639: overrides.iso639 !== undefined ? overrides.iso639 : raw.iso639,
+    taxrate: overrides.taxrate !== undefined ? overrides.taxrate : raw.taxrate,
+    reducedtaxrate: overrides.reducedtaxrate !== undefined ? overrides.reducedtaxrate : raw.reducedtaxrate,
+    rootCategoryId: overrides.rootCategoryId !== undefined ? overrides.rootCategoryId : raw.rootCategoryId,
   };
 }

vite.config.js

@@ -78,17 +78,22 @@ const sharedServer = {
             const responseBody = responseChunks.length
               ? Buffer.concat(responseChunks).toString('utf8')
               : '';
-            const details = {
-              status: proxyRes.statusCode,
-              setCookie: cookies ?? '(none)',
-              response: formatLoggedBody(proxyRes.statusCode, responseBody),
-            };
+            const parts = [
+              '[vite-proxy]',
+              req.method,
+              req.url,
+              String(proxyRes.statusCode),
+            ];
             if (hasRequestBody(req.method)) {
-              details.body = req._proxyRequestBody
-                ? truncate(req._proxyRequestBody)
-                : '(empty)';
+              parts.push(
+                `body=${req._proxyRequestBody ? truncate(req._proxyRequestBody) : '(empty)'}`,
+              );
             }
-            console.log('[vite-proxy]', req.method, req.url, details);
+            if (cookies?.length) {
+              parts.push(`set-cookie=${cookies.map((c) => c.split(';')[0]).join(',')}`);
+            }
+            parts.push(formatLoggedBody(proxyRes.statusCode, responseBody));
+            console.log(parts.join(' '));
           });
         });
       },