fix: resolve UI issues — empty DNS page, ghost checkboxes, tune-up confirm

CHANGELOG.md

@@ -6,6 +6,15 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [1.7.3] - 2026-05-22
+
+### Fixed
+- **Critical: startup crash** — fixed "Entry point DefWindowProc not found in user32.dll"
+  that prevented the app from launching. P/Invoke declaration now correctly specifies
+  `DefWindowProcW` entry point.
+- **Shutdown crash** — fixed ObjectDisposedException when closing the app
+  (DnsHostsViewModel CTS disposal race condition).
+
 ## [1.7.0] - 2026-05-21
 
 ### Added

SysManager/SysManager/ViewModels/DashboardViewModel.cs

@@ -121,11 +121,12 @@ private void RequestElevation()
     [RelayCommand(CanExecute = nameof(CanRunTuneUp))]
     private async Task RunTuneUpAsync()
     {
-        // Confirm Recycle Bin emptying before starting
-        bool emptyBin = DialogService.Instance.Confirm(
-            "Quick Tune-Up will clean temp files and scan your system.\n\n" +
-            "Do you also want to empty the Recycle Bin?",
-            "Quick Tune-Up");
+        if (!DialogService.Instance.Confirm(
+            "Quick Tune-Up will clean temp files, empty Recycle Bin, and scan your system.\n\nProceed?",
+            "Quick Tune-Up — Confirm"))
+            return;
+
+        bool emptyBin = true;
 
         var opLock = OperationLockService.Instance.TryAcquire(
             OperationCategory.Disk, "Quick Tune-Up");

SysManager/SysManager/Views/DnsHostsView.xaml

@@ -23,7 +23,7 @@
                        Style="{StaticResource Subtle}" Margin="0,4,0,0"/>
             <TextBlock Text="Requires administrator." Foreground="#EF4444" FontSize="11"
                        Margin="0,2,0,0"
-                       Visibility="{Binding IsElevated, Converter={StaticResource BoolToVisInv}}"/>
+                       Visibility="{Binding IsElevated, Converter={StaticResource FlexVis}, ConverterParameter=Inverse}"/>
         </StackPanel>
 
         <!-- DNS Section -->

SysManager/SysManager/Views/UninstallerView.xaml

@@ -65,7 +65,8 @@
                       RowBackground="Transparent" AlternatingRowBackground="#0F141C"
                       SelectionMode="Single" CanUserSortColumns="True"
                       VirtualizingPanel.IsVirtualizing="True"
-                      VirtualizingPanel.VirtualizationMode="Recycling">
+                      VirtualizingPanel.VirtualizationMode="Recycling"
+                      Visibility="{Binding FilteredApps.Count, Converter={StaticResource GreaterThanZero}}">
                 <DataGrid.Columns>
                     <DataGridCheckBoxColumn Header="" Width="32"
                                             Binding="{Binding IsSelected, UpdateSourceTrigger=PropertyChanged}"

SysManager/SysManager/Views/WindowsUpdateView.xaml

@@ -127,7 +127,8 @@
                       RowBackground="Transparent" AlternatingRowBackground="#0F141C"
                       SelectionMode="Single" CanUserSortColumns="True"
                       VirtualizingPanel.IsVirtualizing="True"
-                      VirtualizingPanel.VirtualizationMode="Recycling">
+                      VirtualizingPanel.VirtualizationMode="Recycling"
+                      Visibility="{Binding UpdateCount, Converter={StaticResource GreaterThanZero}}">
                 <DataGrid.Columns>
                     <DataGridCheckBoxColumn Header="✓" Binding="{Binding IsSelected, UpdateSourceTrigger=PropertyChanged}" Width="36"/>