feat: add approval ui for join requests

priv/repo/seeds_dev.exs

@@ -481,8 +481,50 @@ for {email, values} <- custom_value_assignments do
   end
 end
 
+# Join form: enable so membership application list is visible in dev
+case Membership.get_settings() do
+  {:ok, settings} ->
+    unless settings.join_form_enabled do
+      Membership.update_settings(settings, %{
+        join_form_enabled: true,
+        join_form_field_ids: settings.join_form_field_ids || ["email", "first_name", "last_name", "city"],
+        join_form_field_required: settings.join_form_field_required || %{
+          "email" => true,
+          "first_name" => false,
+          "last_name" => false,
+          "city" => false
+        }
+      })
+    end
+  _ ->
+    :ok
+end
+
+# Membership applications (join requests) for UI testing: 4 submitted, 1 with extra form_data
+join_request_configs = [
+  %{email: "antrag1@example.de", first_name: "Sandra", last_name: "Meier", form_data: %{"city" => "Berlin"}},
+  %{email: "antrag2@example.de", first_name: "Thomas", last_name: "Bauer", form_data: %{}},
+  %{email: "antrag3@example.de", first_name: "Julia", last_name: "Krause", form_data: %{"city" => "Hamburg", "notes" => "Interesse an Jugendgruppe"}},
+  %{email: "antrag4@example.de", first_name: "Michael", last_name: "Schmitt", form_data: %{"city" => "München"}}
+]
+
+for config <- join_request_configs do
+  attrs = %{
+    email: config.email,
+    first_name: config.first_name,
+    last_name: config.last_name,
+    form_data: config.form_data || %{},
+    schema_version: 1
+  }
+
+  Mv.Membership.JoinRequest
+  |> Ash.Changeset.for_create(:create_submitted, attrs)
+  |> Ash.create!(authorize?: false, domain: Mv.Membership)
+end
+
 IO.puts("✅ Dev seeds completed.")
 IO.puts("   - Members: 20 with country (mostly Deutschland, 1 Österreich, 1 Schweiz)")
 IO.puts("   - Test users: 4 linked to mitglied1–4 with roles Mitglied, Vorstand, Kassenwart, Buchhaltung")
 IO.puts("   - Groups: Vorstand, Jugend, Newsletter (with assignments)")
 IO.puts("   - Custom field values: ~80% filled (16 members, 4–6 fields each)")
+IO.puts("   - Join form enabled; 4 membership applications (join requests) for UI testing")