feat(lieferung/neu): PDF upload with SSE streaming and result dialog

- Add PDF-Upload button to ManifestHeader (delivery forms only)
- New ManifestPdfDialog: live SSE event log, structured basedata,
  and line-items table streamed from POST /api/delivery/parsePDF
- ApiClient.delivery.parsePdfSse: multipart/form-data upload,
  async generator yielding typed SSE events (status, llm_call,
  tool_call, usage, progress, result, error)
- ManifestForm.handlePdfUpload: drives SSE generator, updates
  dialog state in real-time; dialog opens immediately on upload
- Fix MUI icon imports (CheckCircle, ErrorOutlined)

src/components/manifest/ManifestHeader.jsx

@@ -1,7 +1,10 @@
-import { PureComponent } from 'react';
+import { PureComponent, createRef } from 'react';
 import Autocomplete from '@mui/material/Autocomplete';
+import Button from '@mui/material/Button';
+import CircularProgress from '@mui/material/CircularProgress';
 import Stack from '@mui/material/Stack';
 import TextField from '@mui/material/TextField';
+import UploadFileIcon from '@mui/icons-material/UploadFile';
 import SingleLineTextEdit from 'dashgui/SingleLineTextEdit';
 import { PanelTile } from 'dashgui/panels';
 import { manifestConfig, partyDisplayName } from './manifestConfig';
@@ -9,13 +12,27 @@ import { manifestConfig, partyDisplayName } from './manifestConfig';
 class ManifestHeader extends PureComponent {
   constructor(props) {
     super(props);
+    this.fileInputRef = createRef();
     this.handlePartyChange = this.handlePartyChange.bind(this);
+    this.handleUploadClick = this.handleUploadClick.bind(this);
+    this.handleFileChange = this.handleFileChange.bind(this);
   }
 
   handlePartyChange(_event, option) {
     this.props.onPartyChange(option?.id ?? null);
   }
 
+  handleUploadClick() {
+    this.fileInputRef.current?.click();
+  }
+
+  handleFileChange(event) {
+    const file = event.target.files?.[0];
+    event.target.value = '';
+    if (!file) return;
+    this.props.onPdfUpload?.(file);
+  }
+
   render() {
     const {
       kind,
@@ -29,6 +46,8 @@ class ManifestHeader extends PureComponent {
       number,
       externalNumber,
       saving,
+      pdfUploading,
+      onPdfUpload,
       onDateChange,
       onNumberChange,
       onExternalNumberChange,
@@ -44,13 +63,13 @@ class ManifestHeader extends PureComponent {
 
     return (
       <PanelTile wide={3} minHeight={160} color={headerColor} title="Kopfdaten">
-        <Stack direction={{ xs: 'column', sm: 'row' }} spacing={2}>
+        <Stack direction={{ xs: 'column', sm: 'row' }} spacing={2} alignItems={{ xs: 'stretch', sm: 'center' }}>
           <TextField
             size="small"
             type="date"
             label={dateLabel}
             value={date}
-            disabled={saving}
+            disabled={saving || pdfUploading}
             onChange={(e) => onDateChange(e.target.value)}
             autoComplete="off"
             slotProps={{
@@ -64,7 +83,7 @@ class ManifestHeader extends PureComponent {
             options={parties}
             value={selected}
             loading={Boolean(partiesLoading)}
-            disabled={saving}
+            disabled={saving || pdfUploading}
             getOptionLabel={(option) => partyDisplayName(kind, option)}
             isOptionEqualToValue={(option, value) => option.id === value.id}
             onChange={this.handlePartyChange}
@@ -88,7 +107,7 @@ class ManifestHeader extends PureComponent {
             size="small"
             label="Nummer"
             value={number}
-            disabled={saving || useExternalNumber}
+            disabled={saving || pdfUploading || useExternalNumber}
             onChange={onNumberChange}
             sx={{ minWidth: 180, flex: 1 }}
           />
@@ -97,15 +116,37 @@ class ManifestHeader extends PureComponent {
               size="small"
               label="Referenz"
               value={externalNumber ?? ''}
-              disabled={saving}
+              disabled={saving || pdfUploading}
               onChange={onExternalNumberChange}
               sx={{ minWidth: 180, flex: 1 }}
             />
           ) : null}
+          {onPdfUpload ? (
+            <Button
+              variant="outlined"
+              size="small"
+              startIcon={pdfUploading ? <CircularProgress size={16} color="inherit" /> : <UploadFileIcon />}
+              disabled={saving || pdfUploading}
+              onClick={this.handleUploadClick}
+              sx={{ whiteSpace: 'nowrap', height: 40, alignSelf: { xs: 'stretch', sm: 'center' }, px: 2 }}
+            >
+              {pdfUploading ? 'Wird analysiert…' : 'PDF hochladen'}
+            </Button>
+          ) : null}
         </Stack>
+        {onPdfUpload ? (
+          <input
+            ref={this.fileInputRef}
+            type="file"
+            accept="application/pdf,.pdf"
+            style={{ display: 'none' }}
+            onChange={this.handleFileChange}
+          />
+        ) : null}
       </PanelTile>
     );
   }
 }
 
 export default ManifestHeader;
+