fix: FORMAT NATIF hors cadre, apercu glossaire toujours FR/IR, prompt juridique par defaut

frontend/src/lib/store.ts

@@ -130,6 +130,17 @@ export const useTranslationStore = create<TranslationState>()(
     }),
     {
       name: "translation-settings",
+      version: 2,
+      migrate: (persistedState: unknown, fromVersion: number) => {
+        // v1 → v2: clear systemPrompt that may have been pre-filled with legal text
+        if (fromVersion < 2) {
+          const state = persistedState as { settings?: { systemPrompt?: string } };
+          if (state?.settings) {
+            state.settings.systemPrompt = "";
+          }
+        }
+        return persistedState as TranslationState;
+      },
     },
   ),
 );