Ensure history items have valid icons in QueryHistory

Added CheckIcoPathValidity to QueryHistory to set default icons for history items missing IcoPath, addressing legacy data issues. Integrated this check into MainViewModel's RefreshLastOpenedHistoryResults to guarantee icon validity before updating absolute paths.

Flow.Launcher/Storage/QueryHistory.cs

@@ -51,6 +51,24 @@ namespace Flow.Launcher.Storage
             Items.Clear();
         }
 
+        /// <summary>
+        /// Checks all items in <see cref="LastOpenedHistoryItems"/> for empty IcoPath.
+        /// If found, updates it using the history icon.
+        /// </summary>
+        /// <remarks>
+        /// We need this because some prereleased version of Flow did not set the IcoPath when adding.
+        /// </remarks>
+        public void CheckIcoPathValidity()
+        {
+            foreach (var item in LastOpenedHistoryItems)
+            {
+                if (string.IsNullOrEmpty(item.IcoPath))
+                {
+                    item.IcoPath = Constant.HistoryIcon;
+                }
+            }
+        }
+
         /// <summary>
         /// Records a result into the last-opened history list (<see cref="LastOpenedHistoryItems"/>).
         /// This will also update the IcoPath if existing history item has one that is different.

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -1403,7 +1403,7 @@ namespace Flow.Launcher.ViewModel
         internal void RefreshLastOpenedHistoryResults()
         {
             _history.PopulateHistoryFromLegacyHistory();
-
+            _history.CheckIcoPathValidity();
             _history.UpdateIcoPathAbsolute();
         }