feat: split nights off an accommodation booking as separate periods

addresses #869f6z36v

templates/groups/offer/_summary.html.twig

@@ -67,6 +67,16 @@
                             {{ booking.nights }} {{ booking.nights != 1 ? 'Nächte' : 'Nacht' }}
                         </td>
                     </tr>
+                    {% if ctx.priceBreakdown.periods is not empty %}
+                        <tr>
+                            <td class="p-2">Zeitraum Gruppe</td>
+                            <td class="p-2 text-right">
+                                {{ booking.mainDateFrom|date('d.m.Y') }} – {{ booking.mainDateTo|date('d.m.Y') }},
+                                <br>
+                                {{ ctx.priceBreakdown.nights }} {{ ctx.priceBreakdown.nights != 1 ? 'Nächte' : 'Nacht' }}
+                            </td>
+                        </tr>
+                    {% endif %}
                     <tr>
                         <td class="p-2">
                             Anzahl Personen
@@ -88,6 +98,14 @@
                         </tr>
                     {% endif %}
 
+                    {% for period in ctx.priceBreakdown.periods|filter(p => p.position == 'leading') %}
+                        {% include 'groups/offer/_summary_period.html.twig' %}
+                    {% endfor %}
+                    {% if ctx.priceBreakdown.periods is not empty %}
+                        <tr class="border-t border-primary-bg font-semibold">
+                            <td class="p-2" colspan="2">Gruppe</td>
+                        </tr>
+                    {% endif %}
                     {% if ctx.priceBreakdown.basePrice > 0 %}
                         <tr>
                             <td class="p-2">
@@ -141,6 +159,9 @@
                             <td class="p-2 text-right whitespace-nowrap">{{ (ctx.priceBreakdown.runningCosts / 100)|format_currency(currency) }}</td>
                         </tr>
                     {% endif %}
+                    {% for period in ctx.priceBreakdown.periods|filter(p => p.position == 'trailing') %}
+                        {% include 'groups/offer/_summary_period.html.twig' %}
+                    {% endfor %}
                     <tr class="border-t border-primary-bg font-semibold text-base">
                         <td class="p-2">
                             Gesamtpreis

templates/groups/offer/_summary_period.html.twig

@@ -0,0 +1,15 @@
+{#- One split-off period of the offer summary: its range as a heading, then its lines.
+    Context: period, currency. -#}
+<tr class="border-t border-primary-bg font-semibold">
+    <td class="p-2" colspan="2">
+        {% if period.label ?? null %}{{ period.label }} · {% endif %}
+        {{ period.dateFrom|date('d.m.Y') }} – {{ period.dateTo|date('d.m.Y') }},
+        {{ period.nights }} {{ period.nights != 1 ? 'Nächte' : 'Nacht' }}
+    </td>
+</tr>
+{% for line in period.lines %}
+    <tr>
+        <td class="p-2">{{ line.label }}</td>
+        <td class="p-2 text-right whitespace-nowrap">{{ (line.amount / 100)|format_currency(currency) }}</td>
+    </tr>
+{% endfor %}