fix: Borrow-Checker - sync_paths klonen vor der Iteration

Kann nicht &self.sync_paths iterieren und gleichzeitig &mut self
Methoden aufrufen. Clone der Liste loest den Konflikt.

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

clients/desktop/src-tauri/src/sync/engine.rs

@@ -52,7 +52,8 @@ impl SyncEngine {
 
         let tree = self.api.get_sync_tree().await?;
 
-        for sp in &self.sync_paths {
+        let sync_paths = self.sync_paths.clone();
+        for sp in &sync_paths {
             if !sp.enabled { continue; }
 
             let local_dir = PathBuf::from(&sp.local_dir);