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/api/index.js

@@ -81,7 +81,7 @@ async function http(path, { method = 'GET', body } = {}) {
   return json;
 }
 
-async function httpBinary(path, { method = 'POST', body, contentType } = {}) {
+async function httpBinary(path, { method = 'POST', body, contentType, headers: extraHeaders } = {}) {
   const url = new URL(path, window.location.origin).href;
 
   logApi('request', {
@@ -96,7 +96,7 @@ async function httpBinary(path, { method = 'POST', body, contentType } = {}) {
 
   const res = await fetch(path, {
     method,
-    headers: { 'Content-Type': contentType },
+    headers: { 'Content-Type': contentType, ...(extraHeaders || {}) },
     credentials: 'include',
     body,
   });
@@ -603,6 +603,19 @@ export const delivery = {
   delete(id) {
     return http(`/api/delivery/${id}`, { method: 'DELETE' });
   },
+
+  /**
+   * POST /api/delivery/parse-pdf
+   * Body: raw PDF bytes (Content-Type: application/pdf)
+   */
+  parsePdf(file) {
+    return httpBinary('/api/delivery/parse-pdf', {
+      method: 'POST',
+      contentType: 'application/pdf',
+      body: file,
+      headers: file?.name ? { 'X-Filename': encodeURIComponent(file.name) } : undefined,
+    });
+  },
 };
 
 /**