feat: mailing to filtered teamer list

addresses #869dv9bur

templates/admin/teamer/mailing.html.twig

@@ -0,0 +1,80 @@
+{% extends 'administrative/layout.html.twig' %}
+
+{% block title %}Mailing{% endblock %}
+
+{% block content %}
+    <div class="flex items-start justify-between pb-4">
+        <h1 class="text-2xl font-bold">
+            Mailing an das Team
+        </h1>
+        <a href="{{ returnUrl }}" class="btn btn--small btn--secondary shrink-0">
+            Zurück zur Teamübersicht
+        </a>
+    </div>
+
+    <div class="pb-6">
+        {{ include('admin/teamer/_mailing_filter_summary.html.twig', { 'filterDto': filterDto }) }}
+    </div>
+
+    <div class="pb-6">
+        <div class="text-xl font-bold">
+            {{ recipients.eligibleCount }} Empfänger:innen
+        </div>
+        {% if recipients.hasSkipped %}
+            <div class="text-sm text-gray-500">
+                {{ include('admin/teamer/_mailing_skipped.html.twig', { 'recipients': recipients }) }}
+            </div>
+        {% endif %}
+    </div>
+
+    {# the draft is parked on every keystroke so that a trip to the filter and back keeps it,
+       hx-trigger replaces htmx' default submit trigger, the preview button still posts natively #}
+    {{ form_start(form, { 'attr': {
+        'hx-post': path('app_admin_teamer_mailing_draft'),
+        'hx-trigger': 'input changed delay:500ms',
+        'hx-swap': 'none',
+    } }) }}
+    <div class="flex flex-col space-y-4 pb-4 max-w-3xl">
+        {{ form_row(form.subject) }}
+        {{ form_row(form.message) }}
+    </div>
+
+    <div class="pb-8 max-w-3xl text-sm text-gray-500">
+        <div class="pb-2">
+            Platzhalter für Betreff und Nachricht, sie werden beim Senden pro Person ersetzt:
+        </div>
+        <div class="flex flex-wrap gap-2">
+            {% for placeholder, label in placeholders %}
+                <span class="inline-flex items-center space-x-1 py-1 px-2 bg-gray-50 border border-gray-200 rounded">
+                    <code>{{ placeholder }}</code>
+                    <span>{{ label }}</span>
+                </span>
+            {% endfor %}
+        </div>
+    </div>
+
+    <div class="flex items-center space-x-2">
+        {# nobody to write to means there is nothing to confirm, only the preview stays useful #}
+        {% if recipients.eligibleCount > 0 %}
+            <button type="button"
+                    class="btn"
+                    hx-post="{{ path('app_admin_teamer_mailing_confirm') }}"
+                    hx-include="closest form"
+                    hx-target="body"
+                    hx-swap="beforeend">
+                {{ icon('mail', 'w-4 h-4 shrink-0') }}
+                <span>Senden</span>
+            </button>
+        {% endif %}
+        <button type="submit" class="btn btn--secondary">
+            Vorschau an mich senden
+        </button>
+        {% if hasDraft %}
+            <a href="{{ path('app_admin_teamer_mailing_discard') }}" class="btn btn--secondary">
+                Entwurf verwerfen
+            </a>
+        {% endif %}
+    </div>
+    {{ form_rest(form) }}
+    {{ form_end(form) }}
+{% endblock %}