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>

lib/berrypod_web/live/admin/activity.ex

@@ -15,6 +15,7 @@ defmodule BerrypodWeb.Admin.Activity do
       socket
       |> assign(:page_title, "Activity")
       |> assign(:attention_count, ActivityLog.count_needing_attention())
+      |> assign(:show_system, false)
 
     {:ok, socket}
   end
@@ -31,7 +32,8 @@ defmodule BerrypodWeb.Admin.Activity do
         page: page_num,
         tab: tab,
         category: category,
-        search: search
+        search: search,
+        hide_system: !socket.assigns.show_system
       )
 
     socket =
@@ -85,6 +87,11 @@ defmodule BerrypodWeb.Admin.Activity do
     {:noreply, push_patch(socket, to: ~p"/admin/activity?#{params}")}
   end
 
+  def handle_event("toggle_system", _params, socket) do
+    socket = assign(socket, :show_system, !socket.assigns.show_system)
+    {:noreply, refetch_and_reassign(socket)}
+  end
+
   def handle_event("resolve", %{"id" => id}, socket) do
     ActivityLog.resolve(id)
     {:noreply, refetch_and_reassign(socket)}
@@ -171,6 +178,14 @@ defmodule BerrypodWeb.Admin.Activity do
         <.category_chip category="syncs" active={@category} label="Syncs" />
         <.category_chip category="emails" active={@category} label="Emails" />
         <.category_chip category="carts" active={@category} label="Carts" />
+        <label class="admin-toggle-label admin-text-secondary">
+          <input
+            type="checkbox"
+            class="admin-toggle admin-toggle-sm"
+            checked={@show_system}
+            phx-click="toggle_system"
+          /> System events
+        </label>
       </div>
       <.form
         for={%{}}
@@ -380,7 +395,10 @@ defmodule BerrypodWeb.Admin.Activity do
         _ -> true
       end
 
-    tab_match and category_match
+    system_match =
+      if assigns.show_system, do: true, else: !ActivityLog.system_event_type?(entry.event_type)
+
+    tab_match and category_match and system_match
   end
 
   defp build_params(opts) do
@@ -397,7 +415,8 @@ defmodule BerrypodWeb.Admin.Activity do
       page: assigns.pagination.page,
       tab: assigns.tab,
       category: assigns.category,
-      search: assigns.search
+      search: assigns.search,
+      hide_system: !assigns.show_system
     )
   end