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/fr.ts

@@ -1537,7 +1537,9 @@ export const fr: TranslationResources = {
         cursor: "Ligne {{line}}, colonne {{column}}",
         preview: "Aperçu",
         source: "Source",
-        unavailableTitle: "Fichier indisponible sur le disque",
+        deletedTitle: "Fichier supprimé du disque",
+        checkFailedTitle: "Impossible de vérifier le fichier sur le disque",
+        preservedDescription: "La copie ouverte est conservée.",
         conflictDescription: "Le contenu local a été conservé. Choisissez la version à garder.",
         overwrite: "Écraser",
         reload: "Recharger",