feat: add booking time ranges and repeating series

templates/dashboard/_calendar.html.twig

@@ -1,13 +1,15 @@
 {# Server-rendered month grid. No calendar library: prev/next and day selection are plain hx-get
    requests whose response carries nothing but out-of-band blocks, hence hx-swap="none". #}
 {% set weekdays = ['Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa', 'So'] %}
+{# Every link keeps the board's span, so changing the day never silently widens it back to all-day. #}
+{% set time_params = selected_time.allDay ? {} : { von: selected_time.start, bis: selected_time.end } %}
 
 <div class="rounded-md border border-gray-200 p-4">
     <div class="flex items-center justify-between pb-4">
         <button type="button"
                 class="p-1 rounded-md hover:bg-gray-100"
                 aria-label="Voriger Monat"
-                hx-get="{{ path('app_dashboard_day', { date: month_start|date_modify('-1 month')|date('Y-m-d') }) }}"
+                hx-get="{{ path('app_dashboard_day', { date: month_start|date_modify('-1 month')|date('Y-m-d') }|merge(time_params)) }}"
                 hx-swap="none">
             {{ ux_icon('lucide:chevron-left', { class: 'w-5 h-5' }) }}
         </button>
@@ -17,7 +19,7 @@
         <button type="button"
                 class="p-1 rounded-md hover:bg-gray-100"
                 aria-label="Nächster Monat"
-                hx-get="{{ path('app_dashboard_day', { date: month_start|date_modify('+1 month')|date('Y-m-d') }) }}"
+                hx-get="{{ path('app_dashboard_day', { date: month_start|date_modify('+1 month')|date('Y-m-d') }|merge(time_params)) }}"
                 hx-swap="none">
             {{ ux_icon('lucide:chevron-right', { class: 'w-5 h-5' }) }}
         </button>
@@ -47,7 +49,7 @@
                 <button type="button"
                         class="{{ classes }}"
                         aria-pressed="{{ day.is_selected ? 'true' : 'false' }}"
-                        hx-get="{{ path('app_dashboard_day', { date: day.date|date('Y-m-d') }) }}"
+                        hx-get="{{ path('app_dashboard_day', { date: day.date|date('Y-m-d') }|merge(time_params)) }}"
                         hx-swap="none">
                     <span>{{ day.date|date('j') }}</span>
                     {# Team view: the occupancy count is the whole point of showing the month. #}
@@ -66,6 +68,6 @@
         <div class="flex items-center gap-2">
             <span class="w-1.5 h-1.5 rounded-full bg-primary"></span> eigene Buchung
         </div>
-        <div>Zahl = belegte Plätze an dem Tag</div>
+        <div>Zahl = belegte Plätze{{ selected_time.allDay ? ' an dem Tag' : ' zwischen ' ~ selected_time.start ~ ' und ' ~ selected_time.end }}</div>
     </div>
 </div>