Clarify changed and deleted files in the file viewer (#2670)

* fix(app): distinguish changed and deleted files

Successful reads now reconcile transient missing events without letting stale
cached data mask a deletion. File notices expose only actions valid for the
current buffer state.

* fix(app): preserve file state ordering

* fix(app): allow retrying file checks

* fix(app): clear unchanged file conflicts

* fix(app): keep file conflict recovery consistent

Own disk observation and read ordering in one model so stale reads and failed subscriptions cannot produce contradictory actions.

* fix(app): allow retrying file preview errors

Preserve daemon read errors and expose retry for initial and non-editable file loads.

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

@@ -1534,7 +1534,9 @@ export const es: TranslationResources = {
         cursor: "Línea {{line}}, columna {{column}}",
         preview: "Vista previa",
         source: "Código fuente",
-        unavailableTitle: "Archivo no disponible en disco",
+        deletedTitle: "Archivo eliminado del disco",
+        checkFailedTitle: "No se pudo comprobar el archivo en disco",
+        preservedDescription: "La copia abierta se ha conservado.",
         conflictDescription: "Se conservó el búfer local. Elige qué versión mantener.",
         overwrite: "Sobrescribir",
         reload: "Recargar",