Refactor PDF extraction to use chunked upload to bypass proxy size limits

src/lib/api.ts

@@ -199,15 +199,17 @@ export const api = {
   // ==========================================
   
   extractPDF: async (file: File) => {
-    const formData = new FormData();
-    formData.append('file', file);
+    // 1. First upload the file using the chunked uploader to bypass proxy size limits
+    const fileUrl = await api.uploadAsset(file);
     
+    // 2. Then ask the backend to extract text from the now-local file
     const res = await fetch(`${API_URL}/sparkplug/extract`, {
       method: 'POST',
       headers: {
+        'Content-Type': 'application/json',
         'Authorization': `Bearer ${localStorage.getItem('auth_token')}`
       },
-      body: formData
+      body: JSON.stringify({ fileUrl })
     });
     const data = await res.json();
     if (!res.ok) throw new Error(data.error);