Fix document viewer: add dynamic base URL and debug logging for file downloads

b0esche_cloud/lib/pages/document_viewer.dart

@@ -169,9 +169,16 @@ class _DocumentViewerModalState extends State<DocumentViewerModal> {
                 }
                 if (state is DocumentViewerReady) {
                   if (state.caps.isPdf) {
+                    // Log the URL being used for debugging
+                    print('Loading PDF from: ${state.viewUrl}');
+                    print('Using token: ${state.token.substring(0, 20)}...');
                     return SfPdfViewer.network(
                       state.viewUrl.toString(),
                       headers: {'Authorization': 'Bearer ${state.token}'},
+                      onDocumentLoadFailed: (details) {
+                        print('PDF load failed: ${details.error}');
+                        print('Description: ${details.description}');
+                      },
                     );
                   } else {
                     return Container(