fix: ZIP-Download, Share-Status live aktualisieren, Ordner-ZIP bei Share-Links

ZIP-Download fix:
- window.location.href statt a.download fuer API-Downloads
  (a.download funktioniert nicht mit authentifizierten API-Routen)

Share-Status live:
- Dateiliste wird nach jeder Share-Aenderung automatisch neu geladen
  (Link erstellen, Link loeschen, Benutzer-Freigabe setzen/entfernen)
- Gruenes Share-Icon aktualisiert sich sofort ohne F5

Ordner-ZIP bei Share-Links:
- "Ganzen Ordner als ZIP herunterladen" Button bei read/write Ordner-Shares
- Backend: GET /share/<token>/download-zip mit Passwort + Ablauf-Check
- Benachrichtigung an Ersteller bei ZIP-Download

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

backend/app/api/files.py

@@ -652,6 +652,40 @@ def share_download_file(token, file_id):
                      download_name=target_file.name)
 
 
+@api_bp.route('/share/<token>/download-zip', methods=['GET'])
+def share_download_zip(token):
+    """Download the entire shared folder as ZIP."""
+    link = ShareLink.query.filter_by(token=token).first()
+    if not link:
+        return jsonify({'error': 'Link nicht gefunden'}), 404
+
+    if link.is_expired():
+        return jsonify({'error': 'Link abgelaufen'}), 410
+
+    if link.permission not in ('read', 'write'):
+        return jsonify({'error': 'Download nicht erlaubt'}), 403
+
+    if link.password_hash:
+        password = request.args.get('password', '') or request.headers.get('X-Share-Password', '')
+        if not bcrypt.check_password_hash(link.password_hash, password):
+            return jsonify({'error': 'Passwort erforderlich'}), 401
+
+    f = db.session.get(File, link.file_id)
+    if not f.is_folder:
+        return jsonify({'error': 'Kein Ordner'}), 400
+
+    link.download_count += 1
+    db.session.commit()
+
+    try:
+        from app.services.system_mail import notify_share_link_accessed
+        notify_share_link_accessed(link, f.name, request.remote_addr)
+    except Exception:
+        pass
+
+    return _download_folder_as_zip(f)
+
+
 @api_bp.route('/share/<token>/files/<int:file_id>', methods=['DELETE'])
 def share_delete_file(token, file_id):
     """Delete a file from a shared folder (write permission required)."""

frontend/src/views/FilesView.vue

@@ -500,11 +500,7 @@ async function createFolder() {
 }
 
 function downloadFile(data) {
-  const url = filesStore.downloadUrl(data.id)
+  window.location.href = filesStore.downloadUrl(data.id)
-  const a = document.createElement('a')
-  a.href = url
-  a.download = data.name
-  a.click()
 }
 
 function openRename(data) {
@@ -574,6 +570,7 @@ async function shareWithUser() {
     selectedShareUser.value = null
     const res = await apiClient.get(`/files/${shareFile.value.id}/permissions`)
     filePermissions.value = res.data
+    await filesStore.loadFiles(currentParentId())
   } catch (err) {
     toast.add({ severity: 'error', summary: 'Fehler', detail: err.response?.data?.error, life: 5000 })
   }
@@ -584,6 +581,7 @@ async function removeUserShare(permId) {
   try {
     await apiClient.delete(`/files/${shareFile.value.id}/permissions/${permId}`)
     filePermissions.value = filePermissions.value.filter(p => p.id !== permId)
+    await filesStore.loadFiles(currentParentId())
   } catch (err) {
     toast.add({ severity: 'error', summary: 'Fehler', detail: err.response?.data?.error, life: 5000 })
   }
@@ -607,6 +605,7 @@ async function createShare() {
     shareExpiry.value = ''
     shareLinkPermission.value = 'read'
     toast.add({ severity: 'success', summary: 'Link erstellt', life: 3000 })
+    await filesStore.loadFiles(currentParentId())
   } catch (err) {
     console.error('createShare error:', err)
     toast.add({ severity: 'error', summary: 'Fehler', detail: err.response?.data?.error || String(err), life: 5000 })
@@ -624,6 +623,7 @@ async function removeShare(token) {
   try {
     await filesStore.deleteShareLink(token)
     shareLinks.value = shareLinks.value.filter(l => l.token !== token)
+    await filesStore.loadFiles(currentParentId())
   } catch (err) {
     toast.add({ severity: 'error', summary: 'Fehler', detail: err.response?.data?.error, life: 5000 })
   }

frontend/src/views/ShareView.vue

@@ -36,7 +36,11 @@
             <Button label="Herunterladen" icon="pi pi-download" size="large" @click="downloadFile" />
           </div>
 
-          <!-- Folder: file listing (read + write) -->
+          <!-- Folder: ZIP download + file listing (read + write) -->
+          <div v-if="fileInfo.is_folder && fileInfo.download_allowed" class="action-block">
+            <Button label="Ganzen Ordner als ZIP herunterladen" icon="pi pi-file-zip" outlined @click="downloadFolderZip" />
+          </div>
+
           <div v-if="fileInfo.is_folder && fileInfo.permission !== 'upload_only'" class="folder-content">
             <div class="folder-breadcrumb">
               <a class="crumb" @click="navigateToRoot">{{ fileInfo.name }}</a>
@@ -223,6 +227,14 @@ function downloadFile() {
   window.location.href = url
 }
 
+function downloadFolderZip() {
+  let url = `/api/share/${token}/download-zip`
+  if (fileInfo.value?.has_password && password.value) {
+    url += `?password=${encodeURIComponent(password.value)}`
+  }
+  window.location.href = url
+}
+
 function downloadFolderFile(file) {
   let url = `/api/share/${token}/files/${file.id}/download`
   if (fileInfo.value?.has_password && password.value) {