chore: prevent overflow of reading assistance content popup (#2460)

lib/pangea/toolbar/widgets/message_selection_overlay.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 import 'dart:developer';
+import 'dart:math';
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -331,7 +332,7 @@ class MessageOverlayController extends State<MessageSelectionOverlay>
         addBorder: false,
         overlayKey: "${selectedToken!.text.uniqueKey}_toolbar",
         maxHeight: AppConfig.toolbarMaxHeight,
-        maxWidth: AppConfig.toolbarMinWidth,
+        maxWidth: min(AppConfig.toolbarMinWidth, maxWidth),
       );
     }
   }

lib/pangea/toolbar/widgets/reading_assistance_content.dart

@@ -1,3 +1,5 @@
+import 'dart:math';
+
 import 'package:flutter/material.dart';
 
 import 'package:flutter_gen/gen_l10n/l10n.dart';
@@ -147,7 +149,10 @@ class ReadingAssistanceContentState extends State<ReadingAssistanceContent> {
           ),
           constraints: BoxConstraints(
             maxHeight: AppConfig.toolbarMaxHeight,
-            minWidth: AppConfig.toolbarMinWidth,
+            minWidth: min(
+              AppConfig.toolbarMinWidth,
+              widget.overlayController.maxWidth,
+            ),
             minHeight: AppConfig.toolbarMinHeight,
             maxWidth: widget.overlayController.maxWidth,
           ),