fix: Import-500 bei doppelten UIDs, Picker-UI & Settings-URL-State

- Import: Dedupe doppelter UIDs innerhalb der Datei (Nextcloud exportiert
  wiederkehrende Termine als mehrere VEVENTs gleicher UID) -> kein
  UNIQUE-constraint-500 mehr; Commit abgesichert. Test ergaenzt (15 gruen).
- Picker (Gruppen-Sichtbarkeit + Mitglieder): als <div>-Zeilen statt <label>,
  damit die globale ".form-group label"-Uppercase/Grau-Regel das Layout nicht
  mehr zerschiesst. Saubere .pick-row-Optik (Checkbox/Radio links, Name links).
- Einstellungen haben jetzt eigenen URL-State (#...&settings=1): Reload/Cache-
  leeren bleibt in den Einstellungen statt zur Kalenderansicht zu springen.
- Version v27.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/routers/local_router.py

@@ -386,8 +386,17 @@ def _import_ics_into(cal: models.LocalCalendar, raw: bytes, db: Session) -> dict
     parsed = ical_io.parse_ics(raw)
     imported = 0
     skipped = 0
+    errors = list(parsed["errors"])
+    # local_events.uid is globally unique. Dedupe against the DB AND within this
+    # file — e.g. Nextcloud exports recurring events as several VEVENTs sharing a
+    # UID (RECURRENCE-ID overrides), which would otherwise violate the constraint.
+    seen_uids: set[str] = set()
     for item in parsed["events"]:
         uid = item.get("uid") or str(uuid.uuid4())
+        if uid in seen_uids:
+            skipped += 1
+            continue
+        seen_uids.add(uid)
         existing = db.query(models.LocalEvent).filter(models.LocalEvent.uid == uid).first()
         if existing:
             skipped += 1
@@ -407,8 +416,12 @@ def _import_ics_into(cal: models.LocalCalendar, raw: bytes, db: Session) -> dict
         )
         db.add(ev)
         imported += 1
-    db.commit()
+    try:
-    return {"imported": imported, "skipped": skipped, "errors": parsed["errors"]}
+        db.commit()
+    except Exception as exc:
+        db.rollback()
+        raise ValueError(f"Import fehlgeschlagen: {exc}")
+    return {"imported": imported, "skipped": skipped, "errors": errors}
 
 
 @router.post("/calendars/{calendar_id}/import")

backend/tests/test_collaboration.py

@@ -289,6 +289,39 @@ def test_import_dedupes_by_uid(client):
     assert imported and imported[0]["creator"]["display_name"] == "Max Mustermann (importiert)"
 
 
+DUP_UID_ICS = b"""BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Nextcloud
+BEGIN:VEVENT
+UID:recurring@nc
+SUMMARY:Standup
+DTSTART:20260601T090000Z
+DTEND:20260601T091500Z
+RRULE:FREQ=WEEKLY;BYDAY=MO
+END:VEVENT
+BEGIN:VEVENT
+UID:recurring@nc
+RECURRENCE-ID:20260608T090000Z
+SUMMARY:Standup verschoben
+DTSTART:20260608T100000Z
+DTEND:20260608T101500Z
+END:VEVENT
+END:VCALENDAR
+"""
+
+
+def test_import_handles_duplicate_uid_in_file(client):
+    """Nextcloud exports recurring events as multiple VEVENTs sharing a UID;
+    importing must not 500 on the unique constraint."""
+    admin = register_admin(client)
+    cal_id = _make_calendar(client, admin, "NC")
+    files = {"file": ("nc.ics", DUP_UID_ICS, "text/calendar")}
+    r = client.post(f"/api/local/calendars/{cal_id}/import", headers=auth(admin), files=files)
+    assert r.status_code == 200, r.text
+    body = r.json()
+    assert body["imported"] == 1 and body["skipped"] == 1
+
+
 def test_export_contains_organizer_and_rrule(client):
     admin = register_admin(client)
     cal_id = _make_calendar(client, admin, "Export-Test")

frontend/css/app.css

@@ -1859,3 +1859,36 @@ a { color: var(--primary); text-decoration: none; }
 .cal-radio-item:last-child { border-bottom: none; }
 .cal-radio-item:hover { background: var(--bg-surface); }
 .cal-radio-item .cal-item-dot { border-radius: 50%; flex: 0 0 auto; }
+
+/* Picker rows (group-visible calendar radio + group member checkboxes).
+   Deliberately NOT <label> elements, so the global ".form-group label"
+   uppercase/grey styling never applies. */
+.cal-radio-list,
+#group-member-picker {
+  border: 1px solid var(--border);
+  border-radius: 10px;
+  overflow: hidden;
+  max-height: 260px;
+  overflow-y: auto;
+}
+.pick-row {
+  display: flex;
+  align-items: center;
+  justify-content: flex-start;
+  gap: 10px;
+  padding: 10px 14px;
+  cursor: pointer;
+  border-bottom: 1px solid var(--border);
+  text-align: left;
+  text-transform: none;
+  letter-spacing: normal;
+  font-size: 14px;
+  color: var(--text-1);
+}
+.pick-row:last-child { border-bottom: none; }
+.pick-row:hover { background: var(--bg-surface); }
+.pick-row-sel { background: rgba(66, 133, 244, 0.12); }
+.pick-mark { flex: 0 0 auto; width: 18px; text-align: center; color: var(--primary); }
+.pick-dot { flex: 0 0 auto; width: 12px; height: 12px; border-radius: 50%; }
+.pick-dot-empty { background: transparent; }
+.pick-name { flex: 1 1 auto; text-align: left; }

frontend/js/calendar.js

@@ -70,13 +70,19 @@ function readUrlState() {
     const d = new Date(date + 'T00:00:00');
     if (!isNaN(d.getTime())) out.date = d;
   }
+  out.settings = params.get('settings') === '1';
   return out;
 }
 
+// Tracks whether the settings modal is open, so a reload returns to settings
+// instead of the calendar view.
+let uiSettingsOpen = false;
+
 function writeUrlState() {
   const d = state.currentDate;
   const dateStr = `${d.getFullYear()}-${String(d.getMonth()+1).padStart(2,'0')}-${String(d.getDate()).padStart(2,'0')}`;
-  const newHash = `date=${dateStr}&view=${state.currentView}`;
+  let newHash = `date=${dateStr}&view=${state.currentView}`;
+  if (uiSettingsOpen) newHash += '&settings=1';
   if (window.location.hash.replace(/^#/,'') !== newHash) {
     // replaceState statt pushState: prev/next-Klicks sollen nicht jeden
     // einzelnen Tag in den Browser-History-Stack drücken
@@ -130,6 +136,9 @@ export async function initCalendar() {
   handleHAOAuthReturn();
   loadGroups();
 
+  // Reopen the settings modal after a reload if the URL says we were in it.
+  if (readUrlState().settings) openSettingsModal();
+
   // Browser-Back/Forward: URL-Hash → State synchronisieren
   window.addEventListener('hashchange', () => {
     const u = readUrlState();
@@ -2292,17 +2301,19 @@ function renderGroupMemberPicker() {
   const picked = modal.__memberIds || new Set();
   const picker = document.getElementById('group-member-picker');
   picker.innerHTML = dir.length
-    ? dir.map(u =>
+    ? dir.map(u => {
-        `<label class="group-member-item">
+        const on = picked.has(u.id);
-          <input type="checkbox" data-member-id="${u.id}" ${picked.has(u.id) ? 'checked' : ''} />
+        return `<div class="pick-row ${on ? 'pick-row-sel' : ''}" data-member-id="${u.id}" role="checkbox" aria-checked="${on}">
-          <span class="group-member-name">${escHtml(u.display_name || '')}</span>
+          <span class="pick-mark">${on ? '☑' : '☐'}</span>
-        </label>`
+          <span class="pick-name">${escHtml(u.display_name || '')}</span>
-      ).join('')
+        </div>`;
+      }).join('')
     : `<span class="accounts-section-empty">${t('share_no_users')}</span>`;
-  picker.querySelectorAll('input[data-member-id]').forEach(cb => {
+  picker.querySelectorAll('.pick-row').forEach(rowEl => {
-    cb.addEventListener('change', () => {
+    rowEl.addEventListener('click', () => {
-      const id = parseInt(cb.dataset.memberId);
+      const id = parseInt(rowEl.dataset.memberId);
-      if (cb.checked) picked.add(id); else picked.delete(id);
+      if (picked.has(id)) picked.delete(id); else picked.add(id);
+      renderGroupMemberPicker();
     });
   });
 }
@@ -2360,22 +2371,36 @@ function bindGroupUI() {
 function renderGroupVisibleList(selectedId) {
   const el = document.getElementById('cfg-group-visible-list');
   if (!el) return;
+  el.dataset.selected = (selectedId == null) ? '' : String(selectedId);
   const own = state.localCalendars.filter(c => c.owned !== false && !c.group);
-  const opt = (id, name, color) => {
+  const selVal = el.dataset.selected;
-    const checked = (id === null && (selectedId == null)) || id === selectedId;
+  const row = (id, name, color) => {
-    const dot = color ? `<span class="cal-item-dot" style="background:${color};width:12px;height:12px"></span>` : '';
+    const val = (id == null) ? '' : String(id);
-    return `<label class="cal-radio-item">
+    const sel = val === selVal;
-      <input type="radio" name="cfg-group-visible" value="${id == null ? '' : id}" ${checked ? 'checked' : ''} />
+    const dot = color
-      ${dot}<span>${escHtml(name)}</span>
+      ? `<span class="pick-dot" style="background:${color}"></span>`
-    </label>`;
+      : `<span class="pick-dot pick-dot-empty"></span>`;
+    return `<div class="pick-row ${sel ? 'pick-row-sel' : ''}" data-pick="${val}" role="radio" aria-checked="${sel}">
+      <span class="pick-mark">${sel ? '●' : '○'}</span>
+      ${dot}
+      <span class="pick-name">${escHtml(name)}</span>
+    </div>`;
   };
   el.innerHTML =
-    opt(null, t('group_visible_none'), null) +
+    row(null, t('group_visible_none'), null) +
-    own.map(c => opt(c.id, c.name, c.color)).join('');
+    own.map(c => row(c.id, c.name, c.color)).join('');
+  el.querySelectorAll('.pick-row').forEach(r => {
+    r.addEventListener('click', () => {
+      el.dataset.selected = r.dataset.pick;
+      renderGroupVisibleList(r.dataset.pick === '' ? null : parseInt(r.dataset.pick));
+    });
+  });
 }
 
 // ── Settings Modal ────────────────────────────────────────
 function openSettingsModal() {
+  uiSettingsOpen = true;
+  writeUrlState();
   const s = state.settings;
   document.getElementById('cfg-default-view').value  = s.default_view   || 'month';
   document.getElementById('cfg-week-start').value    = s.week_start_day || 'monday';
@@ -2888,8 +2913,8 @@ function bindSettingsModal() {
       language:            document.getElementById('cfg-language').value,
       private_event_visibility: document.getElementById('cfg-private-visibility').value,
     };
-    const gvSel = document.querySelector('input[name="cfg-group-visible"]:checked');
+    const gvVal = document.getElementById('cfg-group-visible-list')?.dataset.selected;
-    settings.group_visible_calendar_id = gvSel && gvSel.value ? parseInt(gvSel.value) : null;
+    settings.group_visible_calendar_id = gvVal ? parseInt(gvVal) : null;
     try {
       await api.put('/settings/', settings);
       state.settings = { ...state.settings, ...settings };
@@ -3205,6 +3230,10 @@ function openModal(id) {
 }
 function closeModal(id) {
   document.getElementById(id).classList.add('hidden');
+  if (id === 'modal-settings') {
+    uiSettingsOpen = false;
+    writeUrlState();
+  }
 }
 
 // Close button bindings (added once)

frontend/js/version.js

@@ -1,2 +1,2 @@
 // Increment APP_VERSION with every code change
-export const APP_VERSION = 'v26';
+export const APP_VERSION = 'v27';