refactor: remove db read on focus for groups view

lib/mv_web/live/group_live/show.ex

@@ -431,11 +431,7 @@ defmodule MvWeb.GroupLive.Show do
   # Add Member Events
   @impl true
   def handle_event("show_add_member_input", _params, socket) do
-    # Reload group to ensure we have the latest members list
-    actor = current_actor(socket)
-    group = socket.assigns.group
-    socket = reload_group(socket, group.slug, actor)
-
+    # Use existing @group from assigns; no DB read on focus. Reload only on commit (add/remove).
     {:noreply,
      socket
      |> assign(:show_add_member_input, true)