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/ApiClient.js

@@ -93,8 +93,56 @@ export class ApiClient {
       update: (id, body) => this.#json('PATCH', `/api/delivery/${enc(id)}`, { body }),
       /** DELETE /api/delivery/{id} → 204 */
       delete: (id) => this.#empty('DELETE', `/api/delivery/${enc(id)}`),
+      /**
+       * POST /api/delivery/parsePDF — multipart/form-data, field "pdf"
+       * Returns an async generator that yields SSE event objects:
+       *   { event: 'status'|'llm_call'|'tool_call'|'usage'|'progress'|'result'|'error', data: object }
+       */
+      parsePdfSse: async function* (file) {
+        const formData = new FormData();
+        formData.append('pdf', file, file.name);
+        const res = await fetch('/api/delivery/parsePDF', {
+          method: 'POST',
+          credentials: 'include',
+          body: formData,
+        });
+        if (!res.ok) {
+          let message = res.statusText;
+          try {
+            const data = await res.json();
+            message = data.error || data.message || message;
+          } catch { /* ignore */ }
+          const err = new Error(message || `Request failed (${res.status})`);
+          err.status = res.status;
+          throw err;
+        }
+        const reader = res.body.getReader();
+        const decoder = new TextDecoder();
+        let buf = '';
+        let currentEvent = 'message';
+        while (true) {
+          const { done, value } = await reader.read();
+          if (done) break;
+          buf += decoder.decode(value, { stream: true });
+          const lines = buf.split('\n');
+          buf = lines.pop(); // keep incomplete last line
+          for (const line of lines) {
+            if (line.startsWith('event:')) {
+              currentEvent = line.slice(6).trim();
+            } else if (line.startsWith('data:')) {
+              const raw = line.slice(5).trim();
+              let data;
+              try { data = JSON.parse(raw); } catch { data = raw; }
+              yield { event: currentEvent, data };
+              currentEvent = 'message';
+            }
+            // blank line or comment: reset
+          }
+        }
+      },
     };
 
+
     this.quote = {
       /** GET /api/quote → { quotes } */
       list: () => this.#json('GET', '/api/quote'),
@@ -326,9 +374,9 @@ export class ApiClient {
     return buildUrl(this.#baseUrl, path);
   }
 
-  async #json(method, path, { body, query, contentType, raw } = {}) {
+  async #json(method, path, { body, query, contentType, raw, headers: extraHeaders } = {}) {
     const url = buildPath(path, query);
-    const headers = {};
+    const headers = { ...extraHeaders };
     let payload;
     if (body !== undefined) {
       if (raw) {