fix: prevent tooltip widget from covering toolbar buttons (#2222)

lib/pangea/toolbar/widgets/message_selection_positioner.dart

@@ -523,13 +523,10 @@ class MessageSelectionPositionerState extends State<MessageSelectionPositioner>
                 );
               },
             ),
-          MeasureRenderBox(
+          Positioned(
-            onChange: _setTooltipSize,
-            child: Positioned(
             top: 0,
-              left: 0,
+            child: MeasureRenderBox(
-              child: Opacity(
+              onChange: _setTooltipSize,
-                opacity: 0.0,
               child: Container(
                 constraints: const BoxConstraints(
                   minWidth: 200.0,
@@ -544,7 +541,6 @@ class MessageSelectionPositionerState extends State<MessageSelectionPositioner>
               ),
             ),
           ),
-          ),
           if (_centeredMessageTopOffset != null && _finishedAnimation)
             Positioned(
               top: max(

lib/pangea/toolbar/widgets/word_zoom/morph_focus_widget.dart

@@ -1,6 +1,10 @@
 // stateful widget that displays morphological label and a shimmer effect while the text is loading
 // takes a token and morphological feature as input
 
+import 'package:flutter/material.dart';
+
+import 'package:flutter_gen/gen_l10n/l10n.dart';
+
 import 'package:fluffychat/pangea/analytics_details_popup/analytics_details_popup.dart';
 import 'package:fluffychat/pangea/analytics_details_popup/morph_meaning_widget.dart';
 import 'package:fluffychat/pangea/analytics_misc/construct_type_enum.dart';
@@ -21,8 +25,6 @@ import 'package:fluffychat/pangea/morphs/morph_repo.dart';
 import 'package:fluffychat/pangea/morphs/morph_tag_display.dart';
 import 'package:fluffychat/pangea/toolbar/widgets/message_selection_overlay.dart';
 import 'package:fluffychat/widgets/future_loading_dialog.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter_gen/gen_l10n/l10n.dart';
 
 class MorphFocusWidget extends StatefulWidget {
   final PangeaToken token;