Correct color call on workshop_ideas index

Author: maebeale

app/views/workshop_ideas/index.html.erb

@@ -1,6 +1,6 @@
 <div class="min-h-screen py-8">
   <div class="max-w-full mx-auto px-4 sm:px-6 lg:px-8">
-    <div class="max-w-7xl mx-auto <%= DomainTheme.bg_class_for(:indigo, intensity: 100) %> border border-gray-200
+    <div class="max-w-7xl mx-auto <%= DomainTheme.bg_class_for(:workshop_ideas, intensity: 100) %> border border-gray-200
     rounded-xl shadow-lg hover:shadow-xl transition-shadow duration-200 p-6">
       <div class="space-y-6">
         <!-- Header -->