feat(calendar): Live-Refresh ueber CalDAV, Tagklick-Navigation, Listen-Ansicht

- caldav.py sendet SSE-Notifications bei Event-PUT/DELETE und Kalender-Loeschung,
  damit das Web-UI auch auf Aenderungen aus DAVx5 sofort reagiert.
- FullCalendar navLinks: Klick auf Tagesnummer im Monatsraster wechselt in
  die Tagesansicht.
- Neue Listen-Ansicht mit Volltext-Suche, Datumsbereich, Kalender-Filter,
  Sortierung nach Datum/Titel und Loeschen-Button pro Zeile.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/dav/caldav.py

@@ -26,8 +26,14 @@ from functools import wraps
 from flask import Response, request
 
 from app.extensions import db
-from app.models.calendar import Calendar, CalendarEvent
+from app.models.calendar import Calendar, CalendarEvent, CalendarShare
 from app.models.user import User
+from app.services.events import notify_calendar_change
+
+
+def _cal_recipients(cal: 'Calendar'):
+    return [s.shared_with_id for s in
+            CalendarShare.query.filter_by(calendar_id=cal.id).all()]
 
 from . import dav_bp
 
@@ -513,6 +519,8 @@ def put_event(username, cal_part, filename):
     existing.ical_data = _extract_vevent_block(raw)
     existing.updated_at = datetime.now(timezone.utc)
     db.session.commit()
+    notify_calendar_change(cal.owner_id, cal.id, 'event',
+                           shared_with=_cal_recipients(cal))
 
     status = 201 if request.method == 'PUT' and not if_match else 204
     return Response('', status, {'ETag': _etag_for_event(existing)})
@@ -541,6 +549,8 @@ def delete_event(username, cal_part, filename):
         return Response('', 404)
     db.session.delete(ev)
     db.session.commit()
+    notify_calendar_change(cal.owner_id, cal.id, 'event',
+                           shared_with=_cal_recipients(cal))
     return Response('', 204)
 
 
@@ -558,8 +568,12 @@ def delete_calendar(username, cal_part):
     cal = _calendar_for(user, cal_id) if cal_id else None
     if not cal:
         return Response('', 404)
+    recipients = _cal_recipients(cal)
+    owner_id = cal.owner_id
+    cid = cal.id
     db.session.delete(cal)
     db.session.commit()
+    notify_calendar_change(owner_id, cid, 'deleted', shared_with=recipients)
     return Response('', 204)
 
 

frontend/src/views/CalendarView.vue

@@ -3,6 +3,7 @@
     <div class="view-header">
       <h2>Kalender</h2>
       <div class="header-actions">
+        <SelectButton v-model="viewMode" :options="viewModeOptions" optionLabel="label" optionValue="value" size="small" />
         <Button icon="pi pi-plus" label="Neuer Kalender" size="small" outlined @click="showNewCalendar = true" />
         <Button icon="pi pi-plus" label="Neuer Termin" size="small" @click="openNewEvent()" />
       </div>
@@ -21,7 +22,7 @@
       </aside>
 
       <div class="calendar-main">
-        <FullCalendar ref="fcRef" :options="calendarOptions">
+        <FullCalendar v-show="viewMode === 'calendar'" ref="fcRef" :options="calendarOptions">
           <template #eventContent="arg">
             <div class="fc-event-content-inner" :title="eventTooltip(arg.event)">
               <span v-if="arg.event.extendedProps.all_day" class="fc-icon">📅</span>
@@ -31,6 +32,59 @@
             </div>
           </template>
         </FullCalendar>
+
+        <div v-if="viewMode === 'list'" class="list-view">
+          <div class="list-filters">
+            <span class="p-input-icon-left" style="flex: 1;">
+              <i class="pi pi-search"></i>
+              <InputText v-model="listSearch" placeholder="Suchen (Titel, Ort, Beschreibung)..." fluid />
+            </span>
+            <InputText v-model="listFrom" type="date" title="Von" />
+            <InputText v-model="listTo" type="date" title="Bis" />
+            <Select v-model="listCalFilter" :options="listCalOptions"
+                    optionLabel="label" optionValue="value" placeholder="Alle Kalender"
+                    showClear style="min-width: 180px" />
+          </div>
+          <div class="list-meta">{{ filteredListEvents.length }} Termin(e)</div>
+          <table class="list-table">
+            <thead>
+              <tr>
+                <th @click="toggleListSort('dtstart')" class="sortable">
+                  Datum <i v-if="listSort === 'dtstart'" :class="listSortDir === 'asc' ? 'pi pi-arrow-up' : 'pi pi-arrow-down'"></i>
+                </th>
+                <th @click="toggleListSort('summary')" class="sortable">
+                  Titel <i v-if="listSort === 'summary'" :class="listSortDir === 'asc' ? 'pi pi-arrow-up' : 'pi pi-arrow-down'"></i>
+                </th>
+                <th>Kalender</th>
+                <th>Ort</th>
+                <th></th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr v-for="ev in filteredListEvents" :key="ev.id" class="list-row" @click="openEditEvent(ev)">
+                <td class="col-date">
+                  <div>{{ formatListDate(ev) }}</div>
+                  <div v-if="!ev.all_day" class="meta-time">{{ formatListTime(ev) }}</div>
+                </td>
+                <td class="col-title">
+                  <span class="cal-dot" :style="{ background: ev._cal?.color }"></span>
+                  {{ ev.summary || '(ohne Titel)' }}
+                  <i v-if="ev.recurrence_rule" class="pi pi-replay" title="Wiederholung" style="margin-left: 0.25rem; font-size: 0.75rem;"></i>
+                </td>
+                <td>{{ ev._cal?.name }}</td>
+                <td>{{ ev.location || '' }}</td>
+                <td class="col-actions" @click.stop>
+                  <Button icon="pi pi-trash" text severity="danger" size="small"
+                          :disabled="ev._cal?.permission === 'read'"
+                          @click="confirmDeleteListEvent(ev)" title="Loeschen" />
+                </td>
+              </tr>
+              <tr v-if="!filteredListEvents.length">
+                <td colspan="5" class="empty-row">Keine Termine gefunden.</td>
+              </tr>
+            </tbody>
+          </table>
+        </div>
       </div>
     </div>
 
@@ -282,6 +336,7 @@ import Dialog from 'primevue/dialog'
 import InputText from 'primevue/inputtext'
 import Textarea from 'primevue/textarea'
 import Select from 'primevue/select'
+import SelectButton from 'primevue/selectbutton'
 import FullCalendar from '@fullcalendar/vue3'
 import dayGridPlugin from '@fullcalendar/daygrid'
 import timeGridPlugin from '@fullcalendar/timegrid'
@@ -301,6 +356,88 @@ const showNewCalendar = ref(false)
 const newCalName = ref('')
 const newCalColor = ref('#3788d8')
 
+const viewMode = ref('calendar')
+const viewModeOptions = [
+  { label: 'Kalender', value: 'calendar' },
+  { label: 'Liste', value: 'list' },
+]
+const listEvents = ref([])
+const listSearch = ref('')
+const listFrom = ref('')
+const listTo = ref('')
+const listCalFilter = ref(null)
+const listSort = ref('dtstart')
+const listSortDir = ref('asc')
+
+const listCalOptions = computed(() => calendars.value.map(c => ({ label: c.name, value: c.id })))
+
+const filteredListEvents = computed(() => {
+  const q = listSearch.value.trim().toLowerCase()
+  const fromDt = listFrom.value ? new Date(listFrom.value + 'T00:00:00') : null
+  const toDt = listTo.value ? new Date(listTo.value + 'T23:59:59') : null
+  let arr = listEvents.value.filter(e => {
+    if (listCalFilter.value && e.calendar_id !== listCalFilter.value) return false
+    if (fromDt && new Date(e.dtstart) < fromDt) return false
+    if (toDt && new Date(e.dtstart) > toDt) return false
+    if (q) {
+      const hay = `${e.summary || ''} ${e.location || ''} ${e.description || ''}`.toLowerCase()
+      if (!hay.includes(q)) return false
+    }
+    return true
+  })
+  const dir = listSortDir.value === 'asc' ? 1 : -1
+  const key = listSort.value
+  arr = arr.slice().sort((a, b) => {
+    const av = key === 'dtstart' ? new Date(a.dtstart).getTime() : (a.summary || '').toLowerCase()
+    const bv = key === 'dtstart' ? new Date(b.dtstart).getTime() : (b.summary || '').toLowerCase()
+    return av < bv ? -dir : av > bv ? dir : 0
+  })
+  return arr
+})
+
+function toggleListSort(col) {
+  if (listSort.value === col) listSortDir.value = listSortDir.value === 'asc' ? 'desc' : 'asc'
+  else { listSort.value = col; listSortDir.value = 'asc' }
+}
+
+function formatListDate(ev) {
+  const d = new Date(ev.dtstart)
+  return d.toLocaleDateString('de-DE', { weekday: 'short', day: '2-digit', month: '2-digit', year: 'numeric' })
+}
+function formatListTime(ev) {
+  const fmt = d => new Date(d).toLocaleTimeString('de-DE', { hour: '2-digit', minute: '2-digit' })
+  return ev.dtend ? `${fmt(ev.dtstart)}–${fmt(ev.dtend)}` : fmt(ev.dtstart)
+}
+
+async function loadListEvents() {
+  // Lade alle Termine ueber die letzten 90 Tage und naechsten 365 Tage hinweg.
+  const start = new Date(); start.setDate(start.getDate() - 90)
+  const end = new Date(); end.setDate(end.getDate() + 365)
+  const all = []
+  for (const cal of calendars.value) {
+    if (visibleCalendars[cal.id] === false) continue
+    try {
+      const res = await apiClient.get(`/calendars/${cal.id}/events`, {
+        params: { start: start.toISOString(), end: end.toISOString() },
+      })
+      for (const e of res.data) all.push({ ...e, _cal: cal })
+    } catch { /* ignore */ }
+  }
+  listEvents.value = all
+}
+
+async function confirmDeleteListEvent(ev) {
+  if (!confirm(`Termin "${ev.summary || '(ohne Titel)'}" wirklich loeschen?`)) return
+  try {
+    await apiClient.delete(`/events/${ev.id}`)
+    toast.add({ severity: 'success', summary: 'Geloescht', life: 2000 })
+    await loadListEvents()
+    refreshEvents()
+  } catch (err) {
+    toast.add({ severity: 'error', summary: 'Fehler', detail: err.response?.data?.error, life: 5000 })
+  }
+}
+
 const showEventDialog = ref(false)
 const editingEvent = ref(null)
 const eventForm = ref({
@@ -377,6 +514,8 @@ const calendarOptions = computed(() => ({
     center: 'title',
     right: 'dayGridMonth,timeGridWeek,timeGridDay',
   },
+  navLinks: true,
+  navLinkDayClick: (date) => fcRef.value?.getApi().changeView('timeGridDay', date),
   locale: deLocale,
   firstDay: 1,
   nowIndicator: true,
@@ -600,6 +739,7 @@ async function onEventDrop(info) {
 
 function refreshEvents() {
   fcRef.value?.getApi().refetchEvents()
+  if (viewMode.value === 'list') loadListEvents()
 }
 
 async function loadCalendars() {
@@ -896,9 +1036,14 @@ function scheduleReload() {
     reloadTimer = null
     await loadCalendars()
     refreshEvents()
+    if (viewMode.value === 'list') await loadListEvents()
   }, 300)
 }
 
+watch(viewMode, async (mode) => {
+  if (mode === 'list') await loadListEvents()
+})
+
 onMounted(async () => {
   await loadCalendars()
   refreshEvents()
@@ -968,4 +1113,21 @@ onUnmounted(() => {
 .fc-event-content-inner .fc-icon { flex-shrink: 0; font-size: 0.85em; }
 .fc-event-content-inner .fc-time { flex-shrink: 0; font-weight: 600; font-size: 0.8em; opacity: 0.9; }
 .fc-event-content-inner .fc-title { overflow: hidden; text-overflow: ellipsis; }
+
+.list-view { display: flex; flex-direction: column; gap: 0.75rem; }
+.list-filters { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
+.list-meta { font-size: 0.8rem; color: var(--p-text-muted-color); }
+.list-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
+.list-table th { text-align: left; padding: 0.5rem; border-bottom: 2px solid var(--p-surface-200); font-weight: 600; user-select: none; }
+.list-table th.sortable { cursor: pointer; }
+.list-table th.sortable:hover { background: var(--p-surface-50); }
+.list-table td { padding: 0.5rem; border-bottom: 1px solid var(--p-surface-100); vertical-align: top; }
+.list-row { cursor: pointer; }
+.list-row:hover { background: var(--p-surface-50); }
+.col-date { white-space: nowrap; min-width: 140px; }
+.col-title { font-weight: 500; }
+.col-actions { width: 60px; text-align: right; }
+.cal-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 0.4rem; vertical-align: middle; }
+.meta-time { font-size: 0.75rem; color: var(--p-text-muted-color); }
+.empty-row { text-align: center; padding: 2rem !important; color: var(--p-text-muted-color); }
 </style>