style: apply dart format across project

lib/providers/navigation_provider.dart

@@ -36,25 +36,25 @@ class NavigationProvider extends ChangeNotifier {
 
   void updateCurrentIndex(int index, {bool addToHistory = true}) {
     if (_currentIndex == index) return;
-    
+
     _currentIndex = index;
     _currentRoute = indexToRoute[index] ?? '/';
     _currentTitle = indexToTitle[index] ?? 'home';
-    
+
     if (addToHistory && index >= 0) {
       _navigationHistory.add(index);
       if (_navigationHistory.length > 10) {
         _navigationHistory.removeAt(0);
       }
     }
-    
+
     notifyListeners();
   }
 
   void updateByRoute(String route) {
     final index = routeToIndex[route] ?? 0;
     _currentRoute = route;
-    
+
     if (index >= 0) {
       _currentIndex = index;
       _currentTitle = indexToTitle[index] ?? 'home';
@@ -70,7 +70,7 @@ class NavigationProvider extends ChangeNotifier {
           _currentTitle = 'home';
       }
     }
-    
+
     notifyListeners();
   }
 
@@ -103,4 +103,4 @@ class NavigationProvider extends ChangeNotifier {
     _navigationHistory.add(0);
     notifyListeners();
   }
-}
+}