feat(installer): show version info and offer worker restart in settings

- Surface Latest version and flag unparseable pre-release tags in
  VersionLabel so users know why auto-update was skipped.
- Prompt to stop/start the worker service after Save, since the
  worker only reads its config at process start.

src/ClaudeDo.Installer/App.xaml.cs

@@ -50,6 +50,7 @@ public partial class App : Application
         context.Mode = state.Mode;
         context.InstalledVersion = state.Existing?.Version;
         context.LatestVersion = state.LatestVersion;
+        context.LatestTagUnparseable = state.LatestTagUnparseable;
         if (state.Existing is not null)
             context.InstallDirectory = state.Existing.InstallDir;