feat: make core pages local-first offline

frontend/lib/shared/services/current_ledger_store.dart

@@ -52,6 +52,17 @@ class CurrentLedgerStore extends ChangeNotifier {
     return _loading ??= _loadCached().whenComplete(() => _loading = null);
   }
 
+  Future<void> refreshRemote() async {
+    if (!SessionStore.instance.isAccount ||
+        SessionStore.instance.shouldUseLocalOnly) {
+      return;
+    }
+    final response = await _dio.get('/api/ledgers');
+    final values = response.data as List;
+    LocalDatabase.instance.cacheLedgers(values);
+    _apply(values);
+  }
+
   Future<void> _loadCached() async {
     _apply(LocalDatabase.instance.ledgers());
   }
@@ -78,11 +89,24 @@ class CurrentLedgerStore extends ChangeNotifier {
     final items = values
         .map((item) => LedgerInfo.fromJson(item as Map<String, dynamic>))
         .toList();
-    _ledgers = items;
-    _current =
+    final current =
         items.where((item) => item.isDefault).firstOrNull ??
         (items.isEmpty ? null : items.first);
-    notifyListeners();
+    final changed =
+        _current?.id != current?.id ||
+        _ledgers.length != items.length ||
+        Iterable<int>.generate(items.length).any((index) {
+          final before = _ledgers[index];
+          final after = items[index];
+          return before.id != after.id ||
+              before.name != after.name ||
+              before.iconKey != after.iconKey ||
+              before.isDefault != after.isDefault ||
+              before.transactionCount != after.transactionCount;
+        });
+    _ledgers = items;
+    _current = current;
+    if (changed) notifyListeners();
   }
 
   Future<void> select(int id) async {