normalize use of gold and yellowLight in activities

now use same color for tooltip popups and activity widgets

lib/pangea/activity_sessions/activity_session_chat/activity_stats_button.dart

@@ -203,9 +203,10 @@ class _ActivityStatsButtonState extends State<ActivityStatsButton> {
       ),
       borderRadius: BorderRadius.circular(12),
       color: enabled
-          ? (theme.brightness == Brightness.light
-              ? AppConfig.yellowLight
-              : Color.lerp(AppConfig.gold, Colors.black, 0.3)!)
+          ? Color.alphaBlend(
+              Theme.of(context).colorScheme.surface.withAlpha(70),
+              AppConfig.gold,
+            )
           : theme.colorScheme.surface,
       depressed: !enabled || widget.controller.showActivityDropdown,
       child: AnimatedContainer(
@@ -214,9 +215,10 @@ class _ActivityStatsButtonState extends State<ActivityStatsButton> {
         height: 40,
         decoration: BoxDecoration(
           color: enabled
-              ? theme.brightness == Brightness.light
-                  ? AppConfig.yellowLight
-                  : Color.lerp(AppConfig.gold, Colors.black, 0.3)!
+              ? Color.alphaBlend(
+                  Theme.of(context).colorScheme.surface.withAlpha(70),
+                  AppConfig.gold,
+                )
               : theme.colorScheme.surface,
           borderRadius: BorderRadius.circular(12),
         ),

lib/pangea/activity_sessions/activity_session_chat/activity_stats_menu.dart

@@ -287,8 +287,12 @@ class VocabTile extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final color =
-        isUsed ? AppConfig.goldLight.withAlpha(100) : Colors.transparent;
+    final color = isUsed
+        ? Color.alphaBlend(
+            Theme.of(context).colorScheme.surface.withAlpha(150),
+            AppConfig.gold,
+          )
+        : Colors.transparent;
     return CompositedTransformTarget(
       link: MatrixState.pAnyState
           .layerLinkAndKey(

lib/pangea/activity_sessions/activity_user_summaries_widget.dart

@@ -123,9 +123,10 @@ class ButtonControlledCarouselView extends StatelessWidget {
                 margin: const EdgeInsets.only(right: 5.0),
                 padding: const EdgeInsets.all(12.0),
                 decoration: ShapeDecoration(
-                  color: Theme.of(context).brightness == Brightness.light
-                      ? AppConfig.yellowLight
-                      : Color.lerp(AppConfig.gold, Colors.black, 0.3),
+                  color: Color.alphaBlend(
+                    Theme.of(context).colorScheme.surface.withAlpha(70),
+                    AppConfig.gold,
+                  ),
                   shape: RoundedRectangleBorder(
                     borderRadius: BorderRadius.circular(12),
                   ),