fix: handle unavailable browser cryptography

Detect insecure or unsupported browser contexts before account registration and show localized HTTPS guidance instead of leaking a SubtleCrypto runtime error.

Fixes #320

webapp/src/lib/i18n/locales/de.ts

@@ -511,6 +511,7 @@ const de: Record<string, string> = {
   "txt_create_account": "Konto erstellen",
   "txt_registering": "Konto wird erstellt...",
   "txt_register_failed": "Registrierung fehlgeschlagen",
+  "txt_web_crypto_unavailable": "Sichere Browser-Kryptografie ist nicht verfügbar. Öffnen Sie NodeWarden über HTTPS in einem unterstützten Browser.",
   "txt_create_folder": "Ordner erstellen",
   "txt_create_folder_failed": "Fehler beim Erstellen des Ordners",
   "txt_create_item_failed": "Fehler beim Erstellen des Eintrags",

webapp/src/lib/i18n/locales/en.ts

@@ -534,6 +534,7 @@ const en: Record<string, string> = {
   "txt_create_account": "Create Account",
   "txt_registering": "Creating account...",
   "txt_register_failed": "Register failed",
+  "txt_web_crypto_unavailable": "Secure browser cryptography is unavailable. Open NodeWarden over HTTPS in a supported browser.",
   "txt_create_folder": "Create Folder",
   "txt_create_folder_failed": "Create folder failed",
   "txt_create_item_failed": "Create item failed",

webapp/src/lib/i18n/locales/es.ts

@@ -511,6 +511,7 @@ const es: Record<string, string> = {
   "txt_create_account": "Crear cuenta",
   "txt_registering": "Creando cuenta...",
   "txt_register_failed": "Error al registrarse",
+  "txt_web_crypto_unavailable": "La criptografía segura del navegador no está disponible. Abra NodeWarden mediante HTTPS en un navegador compatible.",
   "txt_create_folder": "Crear carpeta",
   "txt_create_folder_failed": "Error al crear carpeta",
   "txt_create_item_failed": "Error al crear elemento",

webapp/src/lib/i18n/locales/fi.ts

@@ -511,6 +511,7 @@ const fi: Record<string, string> = {
   "txt_create_account": "Luo tili",
   "txt_registering": "Luodaan tiliä...",
   "txt_register_failed": "Rekisteröinti epäonnistui",
+  "txt_web_crypto_unavailable": "Selaimen suojattu salaus ei ole käytettävissä. Avaa NodeWarden HTTPS-yhteydellä tuetussa selaimessa.",
   "txt_create_folder": "Luo kansio",
   "txt_create_folder_failed": "Kansion luonti epäonnistui",
   "txt_create_item_failed": "Nimikkeen luonti epäonnistui",

webapp/src/lib/i18n/locales/fr.ts

@@ -511,6 +511,7 @@ const fr: Record<string, string> = {
   "txt_create_account": "Créer un compte",
   "txt_registering": "Création du compte...",
   "txt_register_failed": "L'inscription a échoué",
+  "txt_web_crypto_unavailable": "La cryptographie sécurisée du navigateur n’est pas disponible. Ouvrez NodeWarden via HTTPS dans un navigateur compatible.",
   "txt_create_folder": "Créer un dossier",
   "txt_create_folder_failed": "La création du dossier a échoué",
   "txt_create_item_failed": "La création de l'élément a échoué",

webapp/src/lib/i18n/locales/it.ts

@@ -511,6 +511,7 @@ const it: Record<string, string> = {
   "txt_create_account": "Crea Account",
   "txt_registering": "Creazione Account in corso...",
   "txt_register_failed": "Registrazione fallita",
+  "txt_web_crypto_unavailable": "La crittografia sicura del browser non è disponibile. Apri NodeWarden tramite HTTPS in un browser supportato.",
   "txt_create_folder": "Crea cartella",
   "txt_create_folder_failed": "Impossibile creare la cartella",
   "txt_create_item_failed": "Impossibile creare l'elemento",

webapp/src/lib/i18n/locales/ru.ts

@@ -511,6 +511,7 @@ const ru: Record<string, string> = {
   "txt_create_account": "Создать учетную запись",
   "txt_registering": "Создание учетной записи...",
   "txt_register_failed": "Не удалось зарегистрироваться",
+  "txt_web_crypto_unavailable": "Безопасная криптография браузера недоступна. Откройте NodeWarden по HTTPS в поддерживаемом браузере.",
   "txt_create_folder": "Создать папку",
   "txt_create_folder_failed": "Создать папку не удалось",
   "txt_create_item_failed": "Создать элемент не удалось",

webapp/src/lib/i18n/locales/sv.ts

@@ -511,6 +511,7 @@ const sv: Record<string, string> = {
   "txt_create_account": "Skapa konto",
   "txt_registering": "Skapar konto...",
   "txt_register_failed": "Registrering misslyckades",
+  "txt_web_crypto_unavailable": "Säker webbläsarkryptografi är inte tillgänglig. Öppna NodeWarden via HTTPS i en webbläsare som stöds.",
   "txt_create_folder": "Skapa mapp",
   "txt_create_folder_failed": "Misslyckades med att skapa mapp",
   "txt_create_item_failed": "Misslyckades med att skapa objekt",

webapp/src/lib/i18n/locales/zh-CN.ts

@@ -514,6 +514,7 @@ const zhCN: Record<string, string> = {
   "txt_create_account": "创建账户",
   "txt_registering": "正在注册...",
   "txt_register_failed": "注册失败",
+  "txt_web_crypto_unavailable": "当前浏览器环境无法使用安全加密。请通过 HTTPS 打开 NodeWarden，并使用受支持的现代浏览器。",
   "txt_create_folder": "创建文件夹",
   "txt_create_folder_failed": "创建文件夹失败",
   "txt_create_item_failed": "创建项目失败",

webapp/src/lib/i18n/locales/zh-TW.ts

@@ -514,6 +514,7 @@ const zhTW: Record<string, string> = {
   "txt_create_account": "創建賬戶",
   "txt_registering": "正在註冊...",
   "txt_register_failed": "註冊失敗",
+  "txt_web_crypto_unavailable": "目前瀏覽器環境無法使用安全加密。請透過 HTTPS 開啟 NodeWarden，並使用受支援的現代瀏覽器。",
   "txt_create_folder": "創建文件夾",
   "txt_create_folder_failed": "創建文件夾失敗",
   "txt_create_item_failed": "創建項目失敗",