Add Authorization header to modal PDF viewer

b0esche_cloud/lib/pages/document_viewer.dart

@@ -180,9 +180,12 @@ class _DocumentViewerModalState extends State<DocumentViewerModal> {
                   if (state.caps.isPdf) {
                     // Log the URL being used for debugging
                     print('Loading PDF from: ${state.viewUrl}');
-                    // Token is passed via Authorization header in SessionBloc context
+                    // Pass token via Authorization header - SfPdfViewer supports headers parameter
                     return SfPdfViewer.network(
                       state.viewUrl.toString(),
+                      headers: {
+                        'Authorization': 'Bearer ${state.token}',
+                      },
                       onDocumentLoadFailed: (details) {
                         print('PDF load failed: ${details.error}');
                         print('Description: ${details.description}');