fix: reject oversized checkout diffs (#2488)

* fix: reject oversized checkout diffs

* fix(diff): keep large previews from disconnecting clients

The physical socket limit is an OOM backstop, not a frame-size contract. Bound structured diff construction incrementally and report oversized previews without closing the client's socket.

* fix(app): preserve oversized diff state

* fix(diff): stay within relay frame limit

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Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

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

@@ -795,6 +795,8 @@ export const es: TranslationResources = {
         closeChangesTab: "Cerrar la pestaña Cambios",
         binaryFile: "archivo binario",
         tooLarge: "La diferencia es demasiado grande para mostrarse",
+        previewTooLargeTitle: "Este diff es demasiado grande para previsualizarlo",
+        previewTooLargeDescription: "Reduce la comparación para previsualizarla aquí",
         unified: "Diferencia unificada",
         split: "Diferencia de lado a lado",
         switchToUnified: "Cambiar a diferencia unificada",