style: consistent save buttons and active tab

lib/mv_web/live/member_field_live/form_component.ex

@@ -166,12 +166,17 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
             />
           </div>
 
-          <div class="justify-end mt-4 card-actions">
+          <%!-- Buttons: below all form fields, Cancel left (secondary), Speichern right (primary) --%>
+          <div class="mt-6 flex items-center justify-end gap-4">
             <.button type="button" variant="neutral" phx-click="cancel" phx-target={@myself}>
               {gettext("Cancel")}
             </.button>
-            <.button phx-disable-with={gettext("Saving...")} variant="primary">
-              {gettext("Save Field")}
+            <.button
+              type="submit"
+              phx-disable-with={gettext("Saving...")}
+              variant="primary"
+            >
+              {gettext("Save datafield")}
             </.button>
           </div>
         </.form>