feat(i18n): localize ViewModel-built strings via ambient Loc accessor

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.App/Program.cs

@@ -86,6 +86,7 @@ sealed class Program
                 fallback: "en");
         var localizer = new Localizer(localeStore, initialLang);
         TrExtension.Localizer = localizer;
+        ClaudeDo.Ui.Localization.Loc.Current = localizer;
         sc.AddSingleton<ILocalizer>(localizer);
         sc.AddDbContextFactory<ClaudeDoDbContext>(opt =>
             opt.UseSqlite($"Data Source={dbPath}"));