fix(web): Doppelausloesung des Loeschknopfs sperren, Fahrzeugtabelle uebersetzt

VehicleTable.confirmDelete liess das Beschaeftigt-Kennzeichen zwar setzen,
aber nie lesen (const [, setIsDeleting]); Dialogschaltflaechen blieben
waehrend der laufenden Loeschanfrage bedienbar. Kennzeichen jetzt lesbar
gebunden, Dialog reicht den Zustand an Bestaetigen/Abbrechen weiter
(disabled + Sperr-Klassen), und confirmDelete bricht bei bereits laufender
Loeschung selbst ab.

Alle sieben fest verdrahteten Texte und sechs Vorlesehilfen der Tabelle
jetzt ueber next-intl (sieben neue Schluessel im Bereich dkvFleet, gleicher
Schluesselsatz in de.json und en.json).

Nebenbefund beim Testen: `load` haette mit `t` als Abhaengigkeit bei einem
instabilen Uebersetzer-Mock einen Abruf-bei-jedem-Render-Zyklus ausgeloest
— bewusst mit leerem Abhaengigkeitsfeld gelassen. Ausserdem
`vi.restoreAllMocks()` im Testabbau ersetzt: es leerte die Aufrufzaehlung
der reinen vi.fn()-Mocks nicht, wodurch der neue Doppelklick-Test falsche
Aufrufzahlen sah.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TPPB4ApQxzSU1rwV2Ffj9J

apps/web/src/app/(portal)/modules/dkv-fleet/settings/components/VehicleTable.test.tsx

@@ -22,6 +22,7 @@ vi.mock('next-intl', () => ({
         'form.cancelDialog': 'Abbrechen',
         'form.save': 'Speichern',
         'form.cancel': 'Bearbeitung abbrechen',
+        'form.saveRow': 'Änderungen speichern',
       },
     };
     // Support dot-notation keys
@@ -47,7 +48,14 @@ vi.mock('@/lib/dkv-api', () => ({
 
 afterEach(() => {
   cleanup();
-  vi.restoreAllMocks();
+  // vi.restoreAllMocks() does not reset the call history of plain vi.fn()
+  // mocks (no "original" implementation to restore to) — mockDeleteVehicle's
+  // call count was leaking across tests, which the new double-click test
+  // below (toHaveBeenCalledTimes) exposed. vi.clearAllMocks() clears
+  // mock.calls/mock.results on every mock; each test sets its own
+  // mockResolvedValue*/mockImplementation before rendering, so leftover
+  // implementations from the previous test are harmless.
+  vi.clearAllMocks();
 });
 
 describe('VehicleTable', () => {
@@ -113,8 +121,9 @@ describe('VehicleTable', () => {
       expect(screen.getByText(/wird gelöscht/i)).toBeInTheDocument();
     });
 
-    // Confirm the deletion
+    // Confirm the deletion — button label comes from the (unmapped) key
-    const confirmBtn = screen.getByRole('button', { name: 'Löschen' });
+    // 'form.deleteConfirm', proving the text is no longer hardcoded.
+    const confirmBtn = screen.getByRole('button', { name: 'form.deleteConfirm' });
     fireEvent.click(confirmBtn);
 
     await waitFor(() => {
@@ -202,4 +211,86 @@ describe('VehicleTable', () => {
       expect(screen.getByRole('button', { name: 'Bearbeitung abbrechen' })).toBeInTheDocument();
     });
   });
+
+  it('double-clicking the delete confirm button triggers exactly one deleteVehicle call', async () => {
+    mockFetchVehicles.mockResolvedValue([
+      { id: 'v1', kennzeichen: 'M-AB 123', marke: 'VW', modell: 'Golf', fahrer: 'Hans Müller' },
+    ]);
+    // Deletion promise resolution is under the test's own control, so the
+    // in-flight state is actually observable between the two clicks.
+    let resolveDelete: () => void = () => {};
+    mockDeleteVehicle.mockImplementation(
+      () => new Promise<void>((resolve) => { resolveDelete = resolve; }),
+    );
+
+    const { VehicleTable } = await import(
+      '@/app/(portal)/modules/dkv-fleet/settings/components/VehicleTable'
+    );
+    render(<VehicleTable />);
+
+    await waitFor(() => {
+      expect(screen.getByText('M-AB 123')).toBeInTheDocument();
+    });
+
+    fireEvent.click(screen.getByRole('button', { name: 'Fahrzeug löschen' }));
+
+    await waitFor(() => {
+      expect(screen.getByText(/wird gelöscht/i)).toBeInTheDocument();
+    });
+
+    const confirmBtn = screen.getByRole('button', { name: 'form.deleteConfirm' });
+    fireEvent.click(confirmBtn);
+    fireEvent.click(confirmBtn);
+
+    await waitFor(() => {
+      expect(mockDeleteVehicle).toHaveBeenCalledTimes(1);
+    });
+
+    resolveDelete();
+  });
+
+  it('confirm and cancel buttons of the delete dialog are disabled while the deletion is in flight', async () => {
+    mockFetchVehicles.mockResolvedValue([
+      { id: 'v1', kennzeichen: 'M-AB 123', marke: 'VW', modell: 'Golf', fahrer: 'Hans Müller' },
+    ]);
+    let resolveDelete: () => void = () => {};
+    mockDeleteVehicle.mockImplementation(
+      () => new Promise<void>((resolve) => { resolveDelete = resolve; }),
+    );
+
+    const { VehicleTable } = await import(
+      '@/app/(portal)/modules/dkv-fleet/settings/components/VehicleTable'
+    );
+    render(<VehicleTable />);
+
+    await waitFor(() => {
+      expect(screen.getByText('M-AB 123')).toBeInTheDocument();
+    });
+
+    fireEvent.click(screen.getByRole('button', { name: 'Fahrzeug löschen' }));
+
+    const confirmBtn = await screen.findByRole('button', { name: 'form.deleteConfirm' });
+    const cancelBtn = screen.getByRole('button', { name: 'Abbrechen' });
+    fireEvent.click(confirmBtn);
+
+    await waitFor(() => {
+      expect(confirmBtn).toBeDisabled();
+      expect(cancelBtn).toBeDisabled();
+    });
+
+    resolveDelete();
+  });
+
+  it('shows the load-error key when fetchVehicles fails', async () => {
+    mockFetchVehicles.mockRejectedValue(new Error('network down'));
+
+    const { VehicleTable } = await import(
+      '@/app/(portal)/modules/dkv-fleet/settings/components/VehicleTable'
+    );
+    render(<VehicleTable />);
+
+    await waitFor(() => {
+      expect(screen.getByText('errors.loadVehiclesFailed')).toBeInTheDocument();
+    });
+  });
 });

apps/web/src/app/(portal)/modules/dkv-fleet/settings/components/VehicleTable.tsx

@@ -86,11 +86,12 @@ const editInputCls =
 // --- Delete confirm dialog ---
 interface DeleteDialogProps {
   plate: string;
+  isDeleting: boolean;
   onConfirm: () => void;
   onCancel: () => void;
 }
 
-function DeleteDialog({ plate, onConfirm, onCancel }: DeleteDialogProps) {
+function DeleteDialog({ plate, isDeleting, onConfirm, onCancel }: DeleteDialogProps) {
   const t = useTranslations('dkvFleet');
   return (
     <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40">
@@ -105,16 +106,18 @@ function DeleteDialog({ plate, onConfirm, onCancel }: DeleteDialogProps) {
           <button
             type="button"
             onClick={onCancel}
-            className="rounded border border-border px-4 py-2 text-sm text-foreground hover:bg-muted"
+            disabled={isDeleting}
+            className="rounded border border-border px-4 py-2 text-sm text-foreground hover:bg-muted disabled:opacity-50 disabled:cursor-not-allowed"
           >
             {t('form.cancelDialog')}
           </button>
           <button
             type="button"
             onClick={onConfirm}
-            className="rounded bg-destructive px-4 py-2 text-sm font-medium text-destructive-foreground hover:bg-destructive/90"
+            disabled={isDeleting}
+            className="rounded bg-destructive px-4 py-2 text-sm font-medium text-destructive-foreground hover:bg-destructive/90 disabled:opacity-50 disabled:cursor-not-allowed"
           >
-            Löschen
+            {t('form.deleteConfirm')}
           </button>
         </div>
       </div>
@@ -161,7 +164,7 @@ export function VehicleTable() {
 
   // Delete confirm
   const [deleteTarget, setDeleteTarget] = useState<DkvVehicle | null>(null);
-  const [, setIsDeleting] = useState(false);
+  const [isDeleting, setIsDeleting] = useState(false);
 
   // Server error below table
   const [tableError, setTableError] = useState<string | null>(null);
@@ -181,11 +184,13 @@ export function VehicleTable() {
       const data = await fetchVehicles();
       setVehicles(data);
     } catch {
-      setTableError('Fahrzeuge konnten nicht geladen werden.');
+      setTableError(t('errors.loadVehiclesFailed'));
     } finally {
       setIsLoading(false);
     }
-  }, []);
+  }, []); // `t` intentionally excluded: `load` is a dependency of the
+  // mount-time useEffect below, and an unstable `t` identity would turn
+  // that into a fetch-on-every-render loop instead of fetch-once-on-mount.
 
   useEffect(() => {
     load();
@@ -207,7 +212,7 @@ export function VehicleTable() {
 
   const saveEdit = async (id: string) => {
     if (!editState.kennzeichen.trim()) {
-      setEditError('Kennzeichen ist erforderlich.');
+      setEditError(t('errors.licensePlateRequired'));
       return;
     }
     setIsSavingRow(true);
@@ -223,7 +228,7 @@ export function VehicleTable() {
       setEditId(null);
       await load();
     } catch {
-      setEditError('Speichern fehlgeschlagen.');
+      setEditError(t('errors.saveVehicleFailed'));
     } finally {
       setIsSavingRow(false);
     }
@@ -245,7 +250,7 @@ export function VehicleTable() {
 
   const saveNew = async () => {
     if (!newRow.kennzeichen.trim()) {
-      setNewRowError('Kennzeichen ist erforderlich.');
+      setNewRowError(t('errors.licensePlateRequired'));
       return;
     }
     setIsSavingNew(true);
@@ -262,7 +267,7 @@ export function VehicleTable() {
       setNewRow(EMPTY_EDIT);
       await load();
     } catch {
-      setNewRowError('Fahrzeug konnte nicht hinzugefügt werden.');
+      setNewRowError(t('errors.createVehicleFailed'));
     } finally {
       setIsSavingNew(false);
     }
@@ -270,14 +275,14 @@ export function VehicleTable() {
 
   // --- Delete ---
   const confirmDelete = async () => {
-    if (!deleteTarget) return;
+    if (!deleteTarget || isDeleting) return;
     setIsDeleting(true);
     try {
       await deleteVehicle(deleteTarget.id);
       setDeleteTarget(null);
       await load();
     } catch {
-      setTableError('Fahrzeug konnte nicht gelöscht werden.');
+      setTableError(t('errors.deleteVehicleFailed'));
       setDeleteTarget(null);
     } finally {
       setIsDeleting(false);
@@ -394,7 +399,7 @@ export function VehicleTable() {
                       <div className="flex gap-1">
                         <button
                           type="button"
-                          aria-label="Änderungen speichern"
+                          aria-label={t('form.saveRow')}
                           onClick={() => saveEdit(v.id)}
                           disabled={isSavingRow}
                           className={`${iconBtnCls} hover:text-primary`}
@@ -403,7 +408,7 @@ export function VehicleTable() {
                         </button>
                         <button
                           type="button"
-                          aria-label="Bearbeitung abbrechen"
+                          aria-label={t('form.cancel')}
                           onClick={cancelEdit}
                           className={iconBtnCls}
                         >
@@ -429,7 +434,7 @@ export function VehicleTable() {
                       <div className="flex gap-1">
                         <button
                           type="button"
-                          aria-label="Fahrzeug bearbeiten"
+                          aria-label={t('editVehicle')}
                           onClick={() => startEdit(v)}
                           className={iconBtnCls}
                         >
@@ -437,7 +442,7 @@ export function VehicleTable() {
                         </button>
                         <button
                           type="button"
-                          aria-label="Fahrzeug löschen"
+                          aria-label={t('deleteVehicle')}
                           onClick={() => setDeleteTarget(v)}
                           className={`${iconBtnCls} hover:text-destructive`}
                         >
@@ -501,7 +506,7 @@ export function VehicleTable() {
                   <div className="flex gap-1">
                     <button
                       type="button"
-                      aria-label="Änderungen speichern"
+                      aria-label={t('form.saveRow')}
                       onClick={saveNew}
                       disabled={isSavingNew}
                       className={`${iconBtnCls} hover:text-primary`}
@@ -510,7 +515,7 @@ export function VehicleTable() {
                     </button>
                     <button
                       type="button"
-                      aria-label="Bearbeitung abbrechen"
+                      aria-label={t('form.cancel')}
                       onClick={cancelAdd}
                       className={iconBtnCls}
                     >
@@ -536,6 +541,7 @@ export function VehicleTable() {
       {deleteTarget && (
         <DeleteDialog
           plate={deleteTarget.kennzeichen}
+          isDeleting={isDeleting}
           onConfirm={confirmDelete}
           onCancel={() => setDeleteTarget(null)}
         />

apps/web/src/messages/de.json

@@ -670,6 +670,8 @@
       "vehicles": "Fahrzeuge"
     },
     "form": {
+      "saveRow": "Änderungen speichern",
+      "deleteConfirm": "Löschen",
       "protocol": "Protokoll",
       "host": "Host",
       "hostExchange": "EWS-URL",
@@ -706,7 +708,12 @@
     },
     "errors": {
       "pollFailed": "Posteingang konnte nicht geprüft werden. Überprüfe die Konfiguration unter 'Moduleinstellungen > Posteingang'.",
-      "smtpFailed": "Export wurde erstellt, konnte aber nicht gesendet werden. Die Datei ist weiterhin zum Download verfügbar."
+      "smtpFailed": "Export wurde erstellt, konnte aber nicht gesendet werden. Die Datei ist weiterhin zum Download verfügbar.",
+      "licensePlateRequired": "Kennzeichen ist erforderlich.",
+      "loadVehiclesFailed": "Fahrzeuge konnten nicht geladen werden.",
+      "saveVehicleFailed": "Speichern fehlgeschlagen.",
+      "createVehicleFailed": "Fahrzeug konnte nicht hinzugefügt werden.",
+      "deleteVehicleFailed": "Fahrzeug konnte nicht gelöscht werden."
     }
   },
   "marketplace": {

apps/web/src/messages/en.json

@@ -670,6 +670,8 @@
       "vehicles": "Vehicles"
     },
     "form": {
+      "saveRow": "Save changes",
+      "deleteConfirm": "Delete",
       "protocol": "Protocol",
       "host": "Host",
       "hostExchange": "EWS URL",
@@ -706,7 +708,12 @@
     },
     "errors": {
       "pollFailed": "Could not check inbox. Review the configuration under 'Module Settings > Inbox'.",
-      "smtpFailed": "Export was created but could not be sent. The file is still available for manual download."
+      "smtpFailed": "Export was created but could not be sent. The file is still available for manual download.",
+      "licensePlateRequired": "License plate is required.",
+      "loadVehiclesFailed": "Vehicles could not be loaded.",
+      "saveVehicleFailed": "Saving failed.",
+      "createVehicleFailed": "Vehicle could not be added.",
+      "deleteVehicleFailed": "Vehicle could not be deleted."
     }
   },
   "marketplace": {