feat: Rework error handling, upgrade dio, fixed bugs

- Fix grey screen bug when adding labels from documnet upload
- Add more permission checks to conditionally show widgets

lib/features/documents/view/widgets/selection/document_selection_sliver_app_bar.dart

@@ -47,7 +47,7 @@ class DocumentSelectionSliverAppBar extends StatelessWidget {
                   S.of(context)!.documentsSuccessfullyDeleted,
                 );
                 context.read<DocumentsCubit>().resetSelection();
-              } on PaperlessServerException catch (error, stackTrace) {
+              } on PaperlessApiException catch (error, stackTrace) {
                 showErrorMessage(context, error, stackTrace);
               }
             }