feat: open Changes as a workspace tab (#2298)

Open the complete working comparison in a desktop workspace tab while preserving inline sidebar diffs when the tab is closed.

Working and commit comparisons share one diff panel, and workspace layout is the sole owner of live tab persistence and identity.

Refs #1520

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

@@ -789,6 +789,8 @@ export const es: TranslationResources = {
         },
       },
       diff: {
+        openChangesTab: "Abrir la pestaña Cambios",
+        closeChangesTab: "Cerrar la pestaña Cambios",
         binaryFile: "archivo binario",
         tooLarge: "La diferencia es demasiado grande para mostrarse",
         unified: "Diferencia unificada",
@@ -1537,6 +1539,8 @@ export const es: TranslationResources = {
       changesLabel: "Cambios",
       changesSubtitle: "Diferencias del árbol de trabajo",
       commitSubtitle: "Diferencias del commit",
+      uncommittedSubtitle: "Cambios sin confirmar",
+      baseSubtitle: "Comparado con {{baseRef}}",
       directoryMissing: "No se encontró el directorio de Workspace.",
       empty: "Sin cambios",
       loadError: "No se pudieron cargar las diferencias",