Restore compact Changes diff controls (#1945)

* feat(app): restore compact Changes diff controls

Keep the folder tree behind a view toggle while preserving the flat file list as the default.

Move secondary diff options into the overflow menu so the Changes toolbar stays compact.

* fix(app): mirror whitespace diff option copy

* fix(app): polish diff controls review follow-up

packages/app/src/i18n/resources/es.ts

@@ -734,7 +734,13 @@ export const es: TranslationResources = {
         tooLarge: "La diferencia es demasiado grande para mostrarse",
         unified: "Diferencia unificada",
         split: "Diferencia de lado a lado",
+        switchToUnified: "Cambiar a diferencia unificada",
+        switchToSplit: "Cambiar a diferencia lado a lado",
+        showTreeView: "Mostrar árbol de carpetas",
+        showFlatView: "Mostrar lista plana de archivos",
+        options: "Opciones de diferencia",
         hideWhitespace: "Ocultar espacios en blanco",
+        showWhitespace: "Mostrar espacios en blanco",
         scrollLongLines: "Desplazarse por largas filas",
         wrapLongLines: "Envolver largas filas",
         collapseAll: "Contraer todos los archivos",