feat(vereinfacht): member form flash and show page

- Form: show Vereinfacht sync warning after save via SyncFlash
- Show: load API debug response; MembershipFees: contact ID, link, no-contact warning

lib/mv_web/live/member_live/form.ex

@@ -319,11 +319,40 @@ defmodule MvWeb.MemberLive.Form do
     socket =
       socket
       |> put_flash(:info, flash_message)
+      |> maybe_put_vereinfacht_sync_flash(member.id)
       |> push_navigate(to: return_path(socket.assigns.return_to, member))
 
     {:noreply, socket}
   end
 
+  defp maybe_put_vereinfacht_sync_flash(socket, member_id) do
+    case Mv.Vereinfacht.SyncFlash.take(to_string(member_id)) do
+      {:warning, message} ->
+        put_flash(socket, :warning, translate_vereinfacht_flash(message))
+
+      {:ok, _message} ->
+        # Optionally show sync success; for now we keep only the main success message
+        socket
+
+      nil ->
+        socket
+    end
+  end
+
+  defp translate_vereinfacht_flash(message) when is_binary(message) do
+    prefix = "Vereinfacht: "
+
+    if String.starts_with?(message, prefix) do
+      detail = message |> String.trim_leading(prefix) |> String.trim()
+
+      Gettext.dgettext(MvWeb.Gettext, "default", "Vereinfacht: %{detail}",
+        detail: Gettext.dgettext(MvWeb.Gettext, "default", detail)
+      )
+    else
+      Gettext.dgettext(MvWeb.Gettext, "default", message)
+    end
+  end
+
   defp handle_save_error(socket, form) do
     # Always show a flash message when save fails
     # Field-level validation errors are displayed in form fields, but flash provides additional feedback

lib/mv_web/live/member_live/show.ex

@@ -256,6 +256,7 @@ defmodule MvWeb.MemberLive.Show do
           id={"membership-fees-#{@member.id}"}
           member={@member}
           current_user={@current_user}
+          vereinfacht_debug_response={@vereinfacht_debug_response}
         />
       <% end %>
     </Layouts.app>
@@ -264,7 +265,10 @@ defmodule MvWeb.MemberLive.Show do
 
   @impl true
   def mount(_params, _session, socket) do
-    {:ok, assign(socket, :active_tab, :contact)}
+    {:ok,
+     socket
+     |> assign(:active_tab, :contact)
+     |> assign(:vereinfacht_debug_response, nil)}
   end
 
   @impl true
@@ -316,6 +320,16 @@ 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
+    response =
+      case Mv.Vereinfacht.Client.get_contact(contact_id) do
+        {:ok, body} -> {:ok, body}
+        {:error, reason} -> {:error, reason}
+      end
+
+    {:noreply, assign(socket, :vereinfacht_debug_response, response)}
+  end
+
   # Flash set in LiveComponent is not shown in parent layout; child sends this to display flash
   @impl true
   def handle_info({:put_flash, type, message}, socket) do

lib/mv_web/live/member_live/show/membership_fees_component.ex

@@ -50,6 +50,60 @@ defmodule MvWeb.MemberLive.Show.MembershipFeesComponent do
           <% end %>
         </div>
 
+        <%!-- Vereinfacht: contact info when synced, or warning when API is configured but no contact --%>
+        <%= if Mv.Config.vereinfacht_configured?() do %>
+          <%= if @member.vereinfacht_contact_id do %>
+            <div class="mb-4">
+              <label class="label">
+                <span class="label-text font-semibold">{gettext("Vereinfacht")}</span>
+              </label>
+              <div class="flex flex-col gap-1">
+                <span class="font-mono text-sm">
+                  {gettext("Contact ID: %{id}", id: @member.vereinfacht_contact_id)}
+                </span>
+                <.link
+                  :if={Mv.Config.vereinfacht_contact_view_url(@member.vereinfacht_contact_id)}
+                  href={Mv.Config.vereinfacht_contact_view_url(@member.vereinfacht_contact_id)}
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  class="link link-primary inline-flex items-center gap-1"
+                >
+                  {gettext("View contact in Vereinfacht")}
+                  <.icon name="hero-arrow-top-right-on-square" class="inline-block size-4" />
+                </.link>
+                <div class="mt-2">
+                  <span class="text-base-content/70 text-sm">{gettext("Debug:")}</span>
+                  <button
+                    type="button"
+                    phx-click="load_vereinfacht_debug"
+                    phx-value-contact_id={@member.vereinfacht_contact_id}
+                    class="btn btn-sm btn-ghost ml-1"
+                  >
+                    {gettext("Load API response")}
+                  </button>
+                </div>
+                <%= if @vereinfacht_debug_response do %>
+                  <div class="mt-2 rounded border border-base-300 bg-base-200 p-3 overflow-x-auto max-h-96 overflow-y-auto">
+                    <pre class="text-xs whitespace-pre-wrap font-mono"><%= format_vereinfacht_debug_response(@vereinfacht_debug_response) %></pre>
+                  </div>
+                <% end %>
+              </div>
+            </div>
+          <% else %>
+            <div class="mb-4 rounded-lg border border-warning/50 bg-warning/10 p-3">
+              <p class="text-warning font-medium flex items-center gap-2">
+                <.icon name="hero-exclamation-triangle" class="size-5 shrink-0" />
+                {gettext("No Vereinfacht contact exists for this member.")}
+              </p>
+              <p class="text-sm text-base-content/70 mt-1">
+                {gettext(
+                  "Sync this member from Settings (Vereinfacht section) or save the member again to create the contact."
+                )}
+              </p>
+            </div>
+          <% end %>
+        <% end %>
+
         <%!-- Action Buttons (only when user has permission) --%>
         <div class="flex gap-2 mb-4">
           <.button
@@ -439,7 +493,8 @@ defmodule MvWeb.MemberLive.Show.MembershipFeesComponent do
      |> assign_new(:creating_cycle, fn -> false end)
      |> assign_new(:create_cycle_date, fn -> nil end)
      |> assign_new(:create_cycle_error, fn -> nil end)
-     |> assign_new(:regenerating, fn -> false end)}
+     |> assign_new(:regenerating, fn -> false end)
+     |> assign_new(:vereinfacht_debug_response, fn -> nil end)}
   end
 
   @impl true
@@ -997,6 +1052,23 @@ defmodule MvWeb.MemberLive.Show.MembershipFeesComponent do
 
   defp format_create_cycle_period(_date, _interval), do: ""
 
+  defp format_vereinfacht_debug_response({:ok, body}) when is_map(body) do
+    Jason.encode!(body, pretty: true)
+  end
+
+  defp format_vereinfacht_debug_response({:error, {:http, status, detail}})
+       when is_binary(detail) do
+    "Error: HTTP #{status} – #{detail}"
+  end
+
+  defp format_vereinfacht_debug_response({:error, {:http, status, _}}) do
+    "Error: HTTP #{status}"
+  end
+
+  defp format_vereinfacht_debug_response({:error, reason}) do
+    "Error: " <> inspect(reason)
+  end
+
   # Helper component for section box
   attr :title, :string, required: true
   slot :inner_block, required: true