PdfDragButton komplett entfernt (Plattformgrenze)

Test-Ergebnis: Browser kann einer fremden Desktop-App keine echte
lokale Datei zum Anhaengen uebergeben. URL-Drag -> Thunderbird nur Link
(0 Bytes, Fehler beim Senden); Datei-Drop in den Text -> nur Dateiname
als Text; auf die Anhang-Leiste (Thunderbird/Linux) -> ebenfalls kein
echter Anhang; Webmail -> gar nicht moeglich.

Entscheidung: Feature raus. Download- und Anzeigen-Button decken den
Bedarf zuverlaessig ab. PdfDragButton geloescht, fileUrl()-Token-Param
zurueckgebaut. Pentest R131 damit gegenstandslos (kein Drag mehr).

Die separaten Copy-Buttons fuer IBAN + Ausweisnummer im Vertrags-
formular bleiben erhalten.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/pages/contracts/ContractDetail.tsx

@@ -19,7 +19,6 @@ import toast from 'react-hot-toast';
 import JpgToPdfModal from '../../components/ui/JpgToPdfModal';
 import { calculateConsumption, calculateCosts, calculateMultiMeterConsumption } from '../../utils/energyCalculations';
 import CopyButton, { CopyableBlock } from '../../components/ui/CopyButton';
-import PdfDragButton from '../../components/ui/PdfDragButton';
 import AutosaveDateInput from '../../components/ui/AutosaveDateInput';
 import { formatDate } from '../../utils/dateFormat';
 import { useProviderSettings } from '../../hooks/useProviderSettings';
@@ -2652,14 +2651,6 @@ export default function ContractDetail() {
               {c.bankCard.iban}
               <CopyButton value={c.bankCard.iban} />
             </p>
-            {c.bankCard.documentPath && (
-              <div className="mt-1">
-                <PdfDragButton
-                  path={c.bankCard.documentPath}
-                  filename={`Bankkarte-${c.bankCard.iban}`}
-                />
-              </div>
-            )}
             {c.bankCard.bankName && <p className="text-gray-500">{c.bankCard.bankName}</p>}
             {c.bankCard.description && (
               <p className="text-sm text-gray-600 mt-1 italic whitespace-pre-line">
@@ -2675,14 +2666,6 @@ export default function ContractDetail() {
               <CopyButton value={c.identityDocument.documentNumber} />
             </p>
             <p className="text-gray-500">{c.identityDocument.type}</p>
-            {c.identityDocument.documentPath && (
-              <div className="mt-1">
-                <PdfDragButton
-                  path={c.identityDocument.documentPath}
-                  filename={`Ausweis-${c.identityDocument.documentNumber}`}
-                />
-              </div>
-            )}
           </Card>
         )}
       </div>

frontend/src/pages/contracts/ContractForm.tsx

@@ -10,7 +10,6 @@ import Button from '../../components/ui/Button';
 import Input from '../../components/ui/Input';
 import Select from '../../components/ui/Select';
 import CopyButton from '../../components/ui/CopyButton';
-import PdfDragButton from '../../components/ui/PdfDragButton';
 import CustomerInfoModal from '../../components/contracts/CustomerInfoModal';
 import { buildContractLabelParts } from '../../utils/contractLabel';
 import type { ContractType } from '../../types';
@@ -979,12 +978,6 @@ export default function ContractForm() {
                     {selectedBankCard && (
                       <CopyButton value={selectedBankCard.iban} title="IBAN kopieren" />
                     )}
-                    {selectedBankCard?.documentPath && (
-                      <PdfDragButton
-                        path={selectedBankCard.documentPath}
-                        filename={`Bankkarte-${selectedBankCard.iban}`}
-                      />
-                    )}
                   </span>
                 }
                 {...register('bankCardId')}
@@ -1011,12 +1004,6 @@ export default function ContractForm() {
                     {selectedDocument && (
                       <CopyButton value={selectedDocument.documentNumber} title="Ausweisnummer kopieren" />
                     )}
-                    {selectedDocument?.documentPath && (
-                      <PdfDragButton
-                        path={selectedDocument.documentPath}
-                        filename={`Ausweis-${selectedDocument.documentNumber}`}
-                      />
-                    )}
                   </span>
                 }
                 {...register('identityDocumentId')}

frontend/src/pages/customers/CustomerDetail.tsx

@@ -18,7 +18,6 @@ import FileUpload from '../../components/ui/FileUpload';
 import { Edit, Plus, Trash2, MapPin, CreditCard, FileText, Gauge, Eye, EyeOff, Download, Globe, UserPlus, X, Search, Mail, Copy, Check, ChevronDown, ChevronRight, Info, Shield, ShieldCheck, ShieldX, ShieldAlert, Lock, ArrowLeft, Cake, RefreshCw, ExternalLink, Images } from 'lucide-react';
 import JpgToPdfModal from '../../components/ui/JpgToPdfModal';
 import CopyButton, { CopyableBlock } from '../../components/ui/CopyButton';
-import PdfDragButton from '../../components/ui/PdfDragButton';
 import BirthdayManagementModal from '../../components/BirthdayManagementModal';
 import { formatDate } from '../../utils/dateFormat';
 import { getContractTypeInfo } from '../../utils/contractInfo';
@@ -1003,10 +1002,6 @@ function BankCardsTab({
                       <Download className="w-4 h-4" />
                       Download
                     </a>
-                    <PdfDragButton
-                      path={card.documentPath}
-                      filename={`Bankkarte-${card.iban}`}
-                    />
                     {canEdit && (
                       <>
                         <FileUpload
@@ -1243,10 +1238,6 @@ function DocumentsTab({
                       <Download className="w-4 h-4" />
                       Download
                     </a>
-                    <PdfDragButton
-                      path={doc.documentPath}
-                      filename={`Ausweis-${doc.documentNumber}`}
-                    />
                     {canEdit && (
                       <>
                         <FileUpload