chore: Follow up select messages

lib/config/themes.dart

@@ -90,6 +90,7 @@ abstract class FluffyThemes {
       ),
       textSelectionTheme: TextSelectionThemeData(
         selectionColor: colorScheme.onBackground.withAlpha(128),
+        selectionHandleColor: colorScheme.secondary,
       ),
       inputDecorationTheme: InputDecorationTheme(
         border: OutlineInputBorder(

lib/pages/chat/events/message.dart

@@ -157,6 +157,7 @@ class Message extends StatelessWidget {
                 right: 0,
                 child: InkWell(
                   onTap: () => onSelect(event),
+                  onLongPress: () => onSelect(event),
                   borderRadius:
                       BorderRadius.circular(AppConfig.borderRadius / 2),
                   child: Material(