Aggiunge filtri avanzati per i destinatari delle campagne email.

La scelta della lista passa da un wizard a tre passi, con anteprima del conteggio e lista congelata solo dopo la conferma.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/views/mailings/show.html.erb

@@ -1,5 +1,6 @@
 <%= turbo_frame_tag "mailing_live", target: "_top", refresh: "morph" do %>
 <%= tag.div class: "space-y-6", data: (@mailing.sending? ? { controller: "auto-reload", auto_reload_interval_value: 10_000 } : {}) do %>
+  <%= render "mailings/wizard", mailing: @mailing, current: :review %>
   <div class="flex flex-wrap items-start justify-between gap-3">
     <div class="min-w-0">
       <h1 class="text-xl font-semibold tracking-tight md:text-2xl"><%= @mailing.name %></h1>
@@ -30,7 +31,8 @@
       <%= link_to "Cruscotto invii", dashboard_mailings_path, class: "#{btn_secondary} flex-1 sm:flex-none" %>
       <% if @mailing.editable? %>
         <%= link_to "Modifica contenuto", edit_mailing_path(@mailing), class: btn_secondary %>
-        <%= button_to "Aggiorna lista", refresh_recipients_mailing_path(@mailing), method: :post, class: btn_secondary %>
+        <%= link_to "Raffina destinatari", audience_mailing_path(@mailing), class: btn_secondary %>
+        <%= button_to "Rigenera lista", refresh_recipients_mailing_path(@mailing), method: :post, class: btn_secondary %>
       <% elsif @mailing.sending? %>
         <%= button_to "Ferma invio", cancel_mailing_path(@mailing), method: :post,
               class: btn_danger,
@@ -126,6 +128,13 @@
         <% end %>
       </div>
 
+      <% if @mailing.editable? && @recipients.empty? %>
+        <div class="border-b border-zinc-100 px-4 py-4 text-sm text-zinc-600 dark:border-zinc-800 dark:text-zinc-300">
+          Nessuna lista generata. Raffina i filtri e genera la lista congelata.
+          <%= link_to "Scegli destinatari", audience_mailing_path(@mailing), class: "font-medium underline" %>
+        </div>
+      <% end %>
+
       <%= form_with url: update_recipients_mailing_path(@mailing), method: :patch do %>
         <div data-controller="check-all">
           <% if @mailing.editable? %>