Refactor decryption logic to handle empty fields consistently across services

app/login/login/page.tsx

@@ -14,6 +14,18 @@ export default function LoginPage() {
     const {lang, setLang} = useContext(LangContext);
     const [showOfflineWarning, setShowOfflineWarning] = useState(false);
     const [isOnline, setIsOnline] = useState(true);
+    const [resetDone, setResetDone] = useState(false);
+
+    const isDev = process.env.NODE_ENV === 'development';
+
+    const handleDevReset = async () => {
+        try {
+            await tauri.devResetAll();
+            setResetDone(true);
+        } catch (error) {
+            console.error('[DevReset]', error);
+        }
+    };
 
     const toggleLanguage = () => {
         const newLang = lang === 'fr' ? 'en' : 'fr';
@@ -148,6 +160,13 @@ export default function LoginPage() {
                     </div>
                 </div>
             </div>
+            {isDev && (
+                resetDone
+                    ? <span className="mt-6 text-xs text-green-400">Reset OK</span>
+                    : <button onClick={handleDevReset} className="mt-6 px-4 py-2 text-xs text-red-400 border border-red-400/30 rounded-lg hover:bg-red-400/10 transition-colors">
+                        DEV: Reset All Data
+                    </button>
+            )}
         </main>
     );
 }