Unreal build configurations (Development / Shipping / …)

Build Solution now opens a configuration picker (Development Editor,
Development, DebugGame, Shipping) and passes /p:Configuration=<cfg>
/p:Platform=Win64 to MSBuild, which drives UnrealBuildTool for the chosen
config. Streams into the same minimizable build overlay.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/i18n.ts

@@ -78,6 +78,12 @@ const D: Record<string, Tr> = {
   "Build succeeded": { ru: "Сборка успешна", de: "Build erfolgreich", fr: "Compilation réussie", es: "Compilación correcta" },
   "Build failed": { ru: "Сборка провалена", de: "Build fehlgeschlagen", fr: "Échec de la compilation", es: "Compilación fallida" },
   "Starting MSBuild…": { ru: "Запуск MSBuild…", de: "MSBuild wird gestartet…", fr: "Démarrage de MSBuild…", es: "Iniciando MSBuild…" },
+  "Build configuration": { ru: "Конфигурация сборки", de: "Build-Konfiguration", fr: "Configuration de build", es: "Configuración de compilación" },
+  "Editor build for working in-engine (default)": { ru: "Сборка редактора для работы в движке (по умолчанию)", de: "Editor-Build zum Arbeiten in der Engine (Standard)", fr: "Build éditeur pour travailler dans le moteur (défaut)", es: "Build del editor para trabajar en el motor (predeterminado)" },
+  "Standalone game, dev config": { ru: "Отдельная игра, dev-конфиг", de: "Eigenständiges Spiel, Dev-Konfig", fr: "Jeu autonome, config dev", es: "Juego independiente, config dev" },
+  "Game with debuggable game code": { ru: "Игра с отлаживаемым кодом", de: "Spiel mit debugfähigem Code", fr: "Jeu avec code débogable", es: "Juego con código depurable" },
+  "Optimized release build": { ru: "Оптимизированный релизный билд", de: "Optimierter Release-Build", fr: "Build de release optimisé", es: "Build de lanzamiento optimizado" },
+  "Builds via MSBuild → UnrealBuildTool": { ru: "Сборка через MSBuild → UnrealBuildTool", de: "Build über MSBuild → UnrealBuildTool", fr: "Compile via MSBuild → UnrealBuildTool", es: "Compila con MSBuild → UnrealBuildTool" },
   "Open this project in Unreal Engine": { ru: "Открыть проект в Unreal Engine", de: "Projekt in Unreal Engine öffnen", fr: "Ouvrir le projet dans Unreal Engine", es: "Abrir el proyecto en Unreal Engine" },
   "Launching Unreal…": { ru: "Запуск Unreal…", de: "Unreal wird gestartet…", fr: "Lancement d’Unreal…", es: "Iniciando Unreal…" },