fix: po:Freeze=False on all theme brushes to allow runtime mutation

windows/App.xaml

@@ -1,19 +1,20 @@
 <Application x:Class="ClaudeCheckerWindows.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:po="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
              ShutdownMode="OnExplicitShutdown">
     <Application.Resources>
-        <SolidColorBrush x:Key="BackgroundBrush"   Color="#F3F3F3"/>
+        <SolidColorBrush x:Key="BackgroundBrush"   Color="#F3F3F3" po:Freeze="False"/>
-        <SolidColorBrush x:Key="CardBrush"         Color="#FFFFFF"/>
+        <SolidColorBrush x:Key="CardBrush"         Color="#FFFFFF" po:Freeze="False"/>
-        <SolidColorBrush x:Key="AccentBrush"       Color="#F97316"/>
+        <SolidColorBrush x:Key="AccentBrush"       Color="#F97316" po:Freeze="False"/>
-        <SolidColorBrush x:Key="TextBrush"         Color="#1C1C1C"/>
+        <SolidColorBrush x:Key="TextBrush"         Color="#1C1C1C" po:Freeze="False"/>
-        <SolidColorBrush x:Key="SecondaryBrush"    Color="#6E6E6E"/>
+        <SolidColorBrush x:Key="SecondaryBrush"    Color="#6E6E6E" po:Freeze="False"/>
-        <SolidColorBrush x:Key="BorderBrush"       Color="#E0E0E0"/>
+        <SolidColorBrush x:Key="BorderBrush"       Color="#E0E0E0" po:Freeze="False"/>
-        <SolidColorBrush x:Key="BlueBrush"         Color="#0078D4"/>
+        <SolidColorBrush x:Key="BlueBrush"         Color="#0078D4" po:Freeze="False"/>
-        <SolidColorBrush x:Key="ButtonBrush"       Color="#FFFFFF"/>
+        <SolidColorBrush x:Key="ButtonBrush"       Color="#FFFFFF" po:Freeze="False"/>
-        <SolidColorBrush x:Key="SurfaceBrush"      Color="#FAFAFA"/>
+        <SolidColorBrush x:Key="SurfaceBrush"      Color="#FAFAFA" po:Freeze="False"/>
-        <SolidColorBrush x:Key="BannerBgBrush"     Color="#E8F2FB"/>
+        <SolidColorBrush x:Key="BannerBgBrush"     Color="#E8F2FB" po:Freeze="False"/>
-        <SolidColorBrush x:Key="BannerBorderBrush" Color="#B3D6F5"/>
+        <SolidColorBrush x:Key="BannerBorderBrush" Color="#B3D6F5" po:Freeze="False"/>
 
         <Style x:Key="HeaderText" TargetType="TextBlock">
             <Setter Property="FontSize"   Value="10"/>

windows/App.xaml.cs

@@ -17,6 +17,19 @@ public partial class App : Application
 
     protected override void OnStartup(StartupEventArgs e)
     {
+        var logPath = System.IO.Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+            "ClaudeChecker", "startup_crash.txt");
+
+        AppDomain.CurrentDomain.UnhandledException += (_, ex) =>
+            System.IO.File.WriteAllText(logPath, ex.ExceptionObject?.ToString() ?? "unknown");
+
+        DispatcherUnhandledException += (_, ex) =>
+        {
+            System.IO.File.WriteAllText(logPath, ex.Exception?.ToString() ?? "unknown");
+            ex.Handled = false;
+        };
+
         base.OnStartup(e);
         ThemeManager.Initialize();
         SetupTray();

windows/ThemeManager.cs

@@ -2,6 +2,7 @@ using Microsoft.Win32;
 using System;
 using System.Windows;
 using System.Windows.Media;
+using System.Windows.Threading;
 
 namespace ClaudeCheckerWindows;
 
@@ -14,20 +15,17 @@ public static class ThemeManager
     {
         IsDark = ReadIsDark();
         Apply();
-        SystemEvents.UserPreferenceChanged += OnPreferenceChanged;
-    }
 
-    private static void OnPreferenceChanged(object sender, UserPreferenceChangedEventArgs e)
+        var timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(5) };
-    {
+        timer.Tick += (_, _) =>
-        if (e.Category != UserPreferenceCategory.General) return;
-        var nowDark = ReadIsDark();
-        if (nowDark == IsDark) return;
-        IsDark = nowDark;
-        Application.Current.Dispatcher.Invoke(() =>
         {
+            var nowDark = ReadIsDark();
+            if (nowDark == IsDark) return;
+            IsDark = nowDark;
             Apply();
             ThemeChanged?.Invoke();
-        });
+        };
+        timer.Start();
     }
 
     private static bool ReadIsDark()

windows/UpdateManager.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Diagnostics;
+using System.Reflection;
 using System.IO;
 using System.IO.Compression;
 using System.Net.Http;
@@ -55,7 +56,11 @@ public class UpdateManager : INotifyPropertyChanged
 
     public string CurrentVersion =>
         System.Reflection.Assembly.GetExecutingAssembly()
-              .GetName().Version?.ToString(3) ?? "1.0.0";
+              .GetCustomAttribute<System.Reflection.AssemblyInformationalVersionAttribute>()
+              ?.InformationalVersion.Split('+')[0]
+              ?? "1.0.0";
+
+    private bool IsPreReleaseBuild => CurrentVersion.Contains('-');
 
     public UpdateManager()
     {
@@ -91,7 +96,8 @@ public class UpdateManager : INotifyPropertyChanged
                 LatestBetaVersion = beta.Version;
                 BetaAvailable     = true;
 
-                if (BetaChannel && IsNewer(beta.Version, LatestVersion))
+                // Show beta update if user opted in, or if they're already running a beta
+                if ((BetaChannel || IsPreReleaseBuild) && IsNewer(beta.Version, LatestVersion))
                 {
                     LatestVersion   = beta.Version;
                     ReleaseNotes    = beta.Notes ?? "";