feat(settings): make max-turns ceiling editable in General tab

src/ClaudeDo.Ui/ViewModels/Modals/Settings/GeneralSettingsTabViewModel.cs

@@ -17,9 +17,8 @@ public sealed partial class GeneralSettingsTabViewModel : ViewModelBase
     [ObservableProperty] private string _defaultClaudeInstructions = "";
     [ObservableProperty] private string _defaultModel = ModelRegistry.DefaultAlias;
     [ObservableProperty] private int _defaultMaxTurns = 40;
-    // Hard ceiling every resolved max-turns value is clamped to before a run starts. Not directly
-    // editable here yet — loaded and echoed back on save so it round-trips, and drives the clamp
-    // hints on the preset rows below and on AgentConfigEditorViewModel.
+    // Hard ceiling every resolved max-turns value is clamped to before a run starts. Drives the
+    // clamp hints on the preset rows below and on AgentConfigEditorViewModel.
     [ObservableProperty] private int _maxTurnsCeiling = 80;
     [ObservableProperty] private string _defaultPermissionMode = PermissionModeRegistry.DefaultMode;
     [ObservableProperty] private int _maxParallelExecutions = 1;
@@ -97,6 +96,8 @@ public sealed partial class GeneralSettingsTabViewModel : ViewModelBase
 
     public string? Validate()
     {
+        if (MaxTurnsCeiling < 1)
+            return Loc.T("settings.general.maxTurnsCeilingInvalid");
         if (MaxParallelExecutions < 1 || MaxParallelExecutions > 20)
             return "Max parallel executions must be between 1 and 20.";
         if (UsageGateFiveHourPct < 0 || UsageGateFiveHourPct > 100)

src/ClaudeDo.Ui/Views/Modals/SettingsModalView.axaml

@@ -145,6 +145,14 @@
                     </DataTemplate>
                   </ItemsControl.ItemTemplate>
                 </ItemsControl>
+                <StackPanel Spacing="4" Margin="0,4,0,0">
+                  <TextBlock Classes="eyebrow" Text="{loc:Tr settings.general.maxTurnsCeiling}"/>
+                  <NumericUpDown Value="{Binding General.MaxTurnsCeiling, Mode=TwoWay}"
+                                 Minimum="1" Maximum="200" Increment="10" FormatString="0"
+                                 HorizontalAlignment="Left" Width="140"/>
+                  <TextBlock Text="{loc:Tr settings.general.maxTurnsCeilingHint}"
+                             Opacity="0.6" FontSize="12" TextWrapping="Wrap"/>
+                </StackPanel>
               </StackPanel>
               <StackPanel Spacing="4">
                 <TextBlock Classes="field-label" Text="{loc:Tr settings.general.maxParallelExecutions}"/>