Update font size and spacing in AI assist part of plans page (#26437)

GitOrigin-RevId: 2b0e3b68f73e72ef1024db9c1088d20b973f6245

services/web/frontend/stylesheets/app/plans.less

@@ -870,14 +870,14 @@
             list-style: none;
             display: flex;
             flex-direction: column;
-            gap: var(--spacing-05);
-            min-width: 200px;
+            gap: var(--spacing-04);
+            min-width: 210px;
             margin-bottom: 0;
 
             .feature-item {
               display: flex;
               align-items: center;
-              font-size: var(--font-size-02);
+              font-size: var(--font-size-03);
               cursor: default;
 
               .feature-icon {