chore(Pulse): gate Follow button behind Pulse feature flag (#1019)

Signed-off-by: tho <80c5f18be5aafa62cf6198c6335963ba3306b595288117c8ea2f805fc9bdc94a@sprout-oss.stage.blox.sqprod.co>
Co-authored-by: npub14vtk7pvazqrq9639qu7e560wnqtl0d53ca4gjuvq6jzf3k2el23qqlwa7f <ab176f059d100602ea25073d9a69ee9817f7b691c76a897180d48498d959faa2@sprout-oss.stage.blox.sqprod.co>
Co-authored-by: tho <80c5f18be5aafa62cf6198c6335963ba3306b595288117c8ea2f805fc9bdc94a@sprout-oss.stage.blox.sqprod.co>

desktop/src/features/profile/ui/UserProfilePanelSections.tsx

@@ -38,6 +38,7 @@ import { ProfileAvatar } from "@/features/profile/ui/ProfileAvatar";
 import { StatusEmoji } from "@/features/user-status/ui/StatusEmoji";
 import { BotIdenticon } from "@/features/messages/ui/BotIdenticon";
 import type { ManagedAgent, RelayAgent } from "@/shared/api/types";
+import { useFeatureEnabled } from "@/shared/features";
 import { cn } from "@/shared/lib/cn";
 import { useNow } from "@/shared/lib/useNow";
 import { Badge } from "@/shared/ui/badge";
@@ -430,38 +431,29 @@ function ProfilePrimaryActions({
   pubkey: string;
   unfollowMutation: ReturnType<typeof useUnfollowMutation>;
 }) {
+  const showFollowAction = useFeatureEnabled("pulse");
+  const followToggleMutation = isFollowing ? unfollowMutation : followMutation;
+
+  const handleFollowClick = () => {
+    followToggleMutation.mutate(pubkey, {
+      onError: (error) =>
+        toast.error(
+          `${isFollowing ? "Unfollow" : "Follow"} failed: ${error.message}`,
+        ),
+    });
+  };
+
   return (
     <div className="flex items-start justify-center gap-8">
-      {isFollowing ? (
+      {showFollowAction ? (
         <ProfileQuickAction
-          active
-          disabled={unfollowMutation.isPending}
-          icon={UserMinus}
-          label="Unfollow"
-          onClick={() =>
-            unfollowMutation.mutate(pubkey, {
-              onError: (error) =>
-                toast.error(
-                  `Unfollow failed: ${error instanceof Error ? error.message : String(error)}`,
-                ),
-            })
-          }
+          active={isFollowing}
+          disabled={followToggleMutation.isPending}
+          icon={isFollowing ? UserMinus : UserPlus}
+          label={isFollowing ? "Unfollow" : "Follow"}
+          onClick={handleFollowClick}
         />
-      ) : (
-        <ProfileQuickAction
-          disabled={followMutation.isPending}
-          icon={UserPlus}
-          label="Follow"
-          onClick={() =>
-            followMutation.mutate(pubkey, {
-              onError: (error) =>
-                toast.error(
-                  `Follow failed: ${error instanceof Error ? error.message : String(error)}`,
-                ),
-            })
-          }
-        />
-      )}
+      ) : null}
       {onMessage ? (
         <ProfileQuickAction
           icon={MessageSquare}