feat: Update the UI to support the change for Copilot as a universal copilot (#11618)

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/dashboard/components-next/SidebarActionsHeader.story.vue

@@ -0,0 +1,29 @@
+<script setup>
+import SidebarActionsHeader from './SidebarActionsHeader.vue';
+</script>
+
+<template>
+  <Story
+    title="Components/SidebarActionsHeader"
+    :layout="{ type: 'grid', width: '800px' }"
+  >
+    <!-- Default State -->
+    <Variant title="Default State">
+      <SidebarActionsHeader title="Default State" />
+    </Variant>
+
+    <!-- With New Conversation Button -->
+    <Variant title="With New Conversation Button">
+      <!-- eslint-disable-next-line vue/prefer-true-attribute-shorthand -->
+      <SidebarActionsHeader
+        title="With New Conversation Button"
+        :buttons="[
+          {
+            key: 'new_conversation',
+            icon: 'i-lucide-plus',
+          },
+        ]"
+      />
+    </Variant>
+  </Story>
+</template>