feat: Update theme colors for improved visibility in light and dark modes across multiple components

lib/pages/home.dart

@@ -134,8 +134,6 @@ class _HomePageState extends State<HomePage> {
     return Scaffold(
       appBar: AppBar(
         title: Text(titles[_currentIndex]),
-        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
-        foregroundColor: Colors.white,
       ),
       drawer: Drawer(
         child: ListView(
@@ -143,11 +141,18 @@ class _HomePageState extends State<HomePage> {
           children: [
             DrawerHeader(
               decoration: BoxDecoration(
-                color: Theme.of(context).colorScheme.inversePrimary,
+                color: Theme.of(context).brightness == Brightness.dark 
+                  ? Colors.black 
+                  : Colors.white,
               ),
-              child: const Text(
+              child: Text(
                 "Travel Mate",
-                style: TextStyle(color: Colors.white, fontSize: 24),
+                style: TextStyle(
+                  color: Theme.of(context).brightness == Brightness.dark 
+                    ? Colors.white 
+                    : Colors.black, 
+                  fontSize: 24,
+                ),
               ),
             ),
             _buildDrawerItem(icon: Icons.home, title: "Mes voyages", index: 0),