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/fr.ts

@@ -788,6 +788,8 @@ export const fr: TranslationResources = {
         },
       },
       diff: {
+        openChangesTab: "Ouvrir l'onglet Modifications",
+        closeChangesTab: "Fermer l'onglet Modifications",
         binaryFile: "Fichier binaire",
         tooLarge: "Diff trop grand pour être affiché",
         unified: "Différentiel unifié",
@@ -1540,6 +1542,8 @@ export const fr: TranslationResources = {
       changesLabel: "Modifications",
       changesSubtitle: "Différences de l'arbre de travail",
       commitSubtitle: "Différences du commit",
+      uncommittedSubtitle: "Modifications non validées",
+      baseSubtitle: "Comparé à {{baseRef}}",
       directoryMissing: "Répertoire Workspace introuvable.",
       empty: "Aucune modification",
       loadError: "Échec du chargement des différences",