feat: align legacy operator and playout behavior

src/MBN_STOCK_WEBVIEW.LegacyApplication/LegacyIndustrySelectionWorkflow.cs

@@ -82,6 +82,26 @@ public sealed class LegacyIndustrySelectionWorkflow
 
     public LegacyIndustrySelectionSnapshot Current => CreateSnapshot();
 
+    /// <summary>
+    /// Recreates the observable UC2 state for one tab activation. The generation
+    /// increment prevents a request started by the discarded control from restoring
+    /// its rows after the operator has re-entered the tab.
+    /// </summary>
+    public LegacyIndustrySelectionSnapshot ResetForTabActivation(IndustryMarket market)
+    {
+        ValidateMarket(market);
+        Interlocked.Increment(ref _loadGeneration);
+        _market = market;
+        _industries = NoIndustries;
+        _actions = LegacyIndustryActionCatalog.GetActions(market);
+        _selectedIndex = null;
+        _selectedIndustry = null;
+        _firstIndustry = null;
+        _secondIndustry = null;
+        Touch();
+        return CreateSnapshot();
+    }
+
     public async Task<LegacyIndustrySelectionSnapshot> LoadMarketAsync(
         IndustryMarket market,
         CancellationToken cancellationToken = default)