hide system events by default on activity page

Adds a toggle to show/hide internal system events (syncs, job failures,
abandoned cart creation) on the activity feed. Hidden by default so shop
owners only see actionable items. Toggle is ephemeral — resets on page load.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

test/berrypod_web/live/admin/activity_test.exs

@@ -34,13 +34,13 @@ defmodule BerrypodWeb.Admin.ActivityTest do
     end
 
     test "renders activity entries", %{conn: conn} do
-      ActivityLog.log_event("sync.completed", "Product sync finished")
       ActivityLog.log_event("order.created", "Order placed")
+      ActivityLog.log_event("order.shipped", "Order shipped")
 
       {:ok, _view, html} = live(conn, ~p"/admin/activity")
 
-      assert html =~ "Product sync finished"
       assert html =~ "Order placed"
+      assert html =~ "Order shipped"
     end
 
     test "links to order when order_id present", %{conn: conn} do
@@ -72,6 +72,8 @@ defmodule BerrypodWeb.Admin.ActivityTest do
 
       {:ok, view, _html} = live(conn, ~p"/admin/activity")
 
+      # Enable system events so sync.completed is visible
+      render_click(view, "toggle_system")
       html = render_click(view, "category", %{"category" => "syncs"})
 
       assert html =~ "Sync done"
@@ -129,7 +131,11 @@ defmodule BerrypodWeb.Admin.ActivityTest do
         payload: %{connection_id: Ecto.UUID.generate()}
       )
 
-      {:ok, _view, html} = live(conn, ~p"/admin/activity?tab=attention")
+      {:ok, view, _html} = live(conn, ~p"/admin/activity?tab=attention")
+
+      # sync.failed is a system event, hidden by default
+      render_click(view, "toggle_system")
+      html = render(view)
 
       assert html =~ "Retry sync"
     end
@@ -137,10 +143,26 @@ defmodule BerrypodWeb.Admin.ActivityTest do
     test "updates via PubSub", %{conn: conn} do
       {:ok, view, _html} = live(conn, ~p"/admin/activity")
 
-      ActivityLog.log_event("sync.started", "Sync kicked off")
+      ActivityLog.log_event("order.created", "New order arrived")
 
       html = render(view)
-      assert html =~ "Sync kicked off"
+      assert html =~ "New order arrived"
+    end
+
+    test "system events hidden by default, shown after toggle", %{conn: conn} do
+      ActivityLog.log_event("sync.completed", "Sync done")
+      ActivityLog.log_event("order.created", "Order placed")
+
+      {:ok, view, html} = live(conn, ~p"/admin/activity")
+
+      # System events hidden by default
+      refute html =~ "Sync done"
+      assert html =~ "Order placed"
+
+      # Toggle shows system events
+      html = render_click(view, "toggle_system")
+      assert html =~ "Sync done"
+      assert html =~ "Order placed"
     end
   end