fix: add index shifting for batch row insertion redo, remove dead stub

Author: datlechin

TablePro/ContentView.swift

@@ -431,10 +431,6 @@ struct ContentView: View {
         }
     }
 
-    private func saveCurrentSessionState() {
-        // State is automatically saved through bindings
-    }
-
     // MARK: - Persistence
 
     private func deleteConnection(_ connection: DatabaseConnection) {

TablePro/Core/ChangeTracking/DataChangeManager.swift

@@ -665,6 +665,11 @@ final class DataChangeManager {
                     action: action, needsRowRemoval: true, needsRowRestore: false, restoreRow: nil
                 )
             } else {
+                // Shift existing rows up for each insertion point (ascending order)
+                for rowIndex in rowIndices.sorted() {
+                    shiftRowIndicesUp(from: rowIndex)
+                }
+
                 for (index, rowIndex) in rowIndices.enumerated().reversed() {
                     guard index < rowValues.count else { continue }
                     let values = rowValues[index]