Member show: Vereinfacht link only, receipts table from API

- Show only 'Kontakt in Vereinfacht anzeigen' link (no Contact ID / Debug)
- Button loads receipts via get_contact_with_receipts, table with formatted columns

lib/mv_web/live/member_live/show.ex

@@ -256,7 +256,7 @@ defmodule MvWeb.MemberLive.Show do
           id={"membership-fees-#{@member.id}"}
           member={@member}
           current_user={@current_user}
-          vereinfacht_debug_response={@vereinfacht_debug_response}
+          vereinfacht_receipts={@vereinfacht_receipts}
         />
       <% end %>
     </Layouts.app>
@@ -268,7 +268,7 @@ defmodule MvWeb.MemberLive.Show do
     {:ok,
      socket
      |> assign(:active_tab, :contact)
-     |> assign(:vereinfacht_debug_response, nil)}
+     |> assign(:vereinfacht_receipts, nil)}
   end
 
   @impl true
@@ -320,14 +320,14 @@ defmodule MvWeb.MemberLive.Show do
     {:noreply, assign(socket, :active_tab, :membership_fees)}
   end
 
-  def handle_event("load_vereinfacht_debug", %{"contact_id" => contact_id}, socket) do
+  def handle_event("load_vereinfacht_receipts", %{"contact_id" => contact_id}, socket) do
     response =
-      case Mv.Vereinfacht.Client.get_contact(contact_id) do
-        {:ok, body} -> {:ok, body}
+      case Mv.Vereinfacht.Client.get_contact_with_receipts(contact_id) do
+        {:ok, receipts} -> {:ok, receipts}
         {:error, reason} -> {:error, reason}
       end
 
-    {:noreply, assign(socket, :vereinfacht_debug_response, response)}
+    {:noreply, assign(socket, :vereinfacht_receipts, response)}
   end
 
   # Flash set in LiveComponent is not shown in parent layout; child sends this to display flash