fix: reformat code / code improvements

lib/viewmodels/history_view_model.dart

@@ -73,7 +73,8 @@ class HistoryViewModel extends ChangeNotifier {
       _totalCount = results[1] as int;
       _customerNames = results[2] as List<String>;
       _offset = _closedTabs.length;
-    } catch (_) {
+    } catch (e) {
+      debugPrint('HistoryViewModel: load error: $e');
       _errorMessage = 'Could not load tab history.';
     } finally {
       _hasLoaded = true;
@@ -92,7 +93,8 @@ class HistoryViewModel extends ChangeNotifier {
       final more = await _fetchPage(offset: _offset);
       _closedTabs = [..._closedTabs, ...more];
       _offset = _closedTabs.length;
-    } catch (_) {
+    } catch (e) {
+      debugPrint('HistoryViewModel: loadMore error: $e');
       _errorMessage = 'Could not load more tabs.';
     } finally {
       _isLoadingMore = false;