refactor(DirectoryTree): Fix issue where the "Recent" list was not displaying

Added a call to `EnsureRecentLoaded` at the beginning of the `LoadFromCache` method to ensure necessary initialization is completed before loading the cache, thereby preventing potential null reference or state inconsistency issues.

Author: lucienlmy

src/ViewModels/DirectoryTree.cs

@@ -229,6 +229,8 @@ private void SaveRecentRepos()
 
         public void LoadFromCache()
         {
+            EnsureRecentLoaded();
+
             var cache = Preferences.Instance.DirectoryTreeCache;
             if (cache == null || cache.Nodes.Count == 0)
                 return;