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

lib/components/home/home_content.dart

@@ -148,12 +148,23 @@ class _HomeContentState extends State<HomeContent> with AutomaticKeepAliveClient
                     children: [
                       Text(
                         'Bonjour ${user.prenom} !',
-                        style: const TextStyle(fontSize: 28, fontWeight: FontWeight.bold),
+                        style: TextStyle(
+                          fontSize: 28, 
+                          fontWeight: FontWeight.bold,
+                          color: Theme.of(context).brightness == Brightness.dark 
+                            ? Colors.white 
+                            : Colors.black,
+                        ),
                       ),
                       const SizedBox(height: 8),
                       Text(
                         'Vos voyages',
-                        style: TextStyle(fontSize: 16, color: Colors.grey[600]),
+                        style: TextStyle(
+                          fontSize: 16, 
+                          color: Theme.of(context).brightness == Brightness.dark 
+                            ? Colors.white70 
+                            : Colors.grey[600],
+                        ),
                       ),
                       const SizedBox(height: 20),
 

lib/components/settings/settings_theme_content.dart

@@ -12,7 +12,6 @@ class SettingsThemeContent extends StatelessWidget {
     return Scaffold(
       appBar: AppBar(
         title: const Text('Thème'),
-        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
       ),
       body: BlocBuilder<ThemeBloc, ThemeState>(
         builder: (context, state) {