chore: Update app icons and button text

Updates the app icons for both Android and iOS across various sizes and densities.

Changes the text color of the primary button component to white for improved visibility.

lib/components/primary_button_component.dart

@@ -36,7 +36,7 @@ class PrimaryButtonComponent extends StatelessWidget {
               text,
               style: TextStyle(
                 fontWeight: FontWeight.bold,
-                color: AppTheme.of(context).primaryText,
+                color: AppTheme.of(context).white,
               ),
             ),
     );