fix(lite): require a confirmed 8+ character passphrase to encrypt

The Lite "Encrypt wallet" field and the Create/Restore passphrase had no
confirmation and no minimum length; only an empty passphrase was
refused. Encrypting locks the wallet at once, and a locked wallet cannot
reveal its seed, so a typo there could cost a user without a seed backup
their funds. The full-node encrypt dialog already requires 8 characters
and a confirmation.

This applies to new passphrases only. Opening and unlocking are
unchanged: an existing wallet with a shorter passphrase still opens and
unlocks.

- A pure liteEncryptPassphraseValid(pass, confirm): at least 8 bytes and
  equal to the confirmation. It takes string_views, so the page's secret
  buffers are never copied.
- liteLifecyclePassphraseAcceptable(op, pass, confirm) gates the Settings
  create/open/restore request. Open is never checked, because its
  passphrase field also unlocks an existing wallet. Create and Restore
  are checked only when a passphrase was entered; an empty one still
  creates an unencrypted wallet.
- Encrypt gets a Confirm field. The button stays disabled until the
  passphrase is valid, and a hint says why (too short, with the count,
  or not matching).
- Create/Restore show a Confirm row once a passphrase is typed, with the
  same hint. Validate stays disabled while the passphrase is invalid, so
  a click never wipes a typed seed over a passphrase typo. The request
  builder re-checks the rule.
- The confirmation buffers are wiped with their passphrase: after a run
  or an encrypt, and when the Confirm row is hidden.
- Once the wallet is closed, the Settings page wipes the Encrypt,
  Confirm and Decrypt passphrase buffers whole every time, also when no
  secret was revealed; before, closing the wallet wiped them only while
  clearing a revealed backup or secret. They are zeroed in full because
  an emptied field can still hold the old tail past its first NUL.
- New copy under Encrypt: "Anyone with the wallet file can try
  passphrases offline. Back up your seed phrase first and use a long
  passphrase."
- i18n: three new keys (lite_confirm_label, tt_lite_confirm_pass,
  lite_encrypt_offline_warning) in i18n.cpp and the 8 language files,
  added additively. The hints reuse the wizard's wiz_pass_too_short and
  wiz_pass_mismatch. No new CJK glyphs, so the subset font is unchanged.

Tests: the validator rejects empty, short (7) and mismatched or
unconfirmed passphrases, and accepts 8 or more with a match. The request
gate always accepts Open, even "abc" with no confirmation, accepts
Create/Restore without a passphrase, and applies the rule to them
otherwise. An encrypted, locked wallet still opens and unlocks through
the controller with the 3-character passphrase "abc".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

res/lang/de.json

@@ -1008,11 +1008,13 @@
     "lite_birthday_backup": "Geburtstag: %llu  (auch diesen sichern)",
     "lite_birthday_hint": "Blockhöhe, ab der gescannt werden soll. Bei 0 belassen, falls unbekannt (langsamerer vollständiger Scan).",
     "lite_birthday_label": "Geburtsblock",
+    "lite_confirm_label": "Bestätigen",
     "lite_console_backend_commands": "Backend-Befehle:",
     "lite_console_help_passthrough": "Jede andere Eingabe wird als Lite-Wallet-Konsolenbefehl ausgeführt.",
     "lite_copy": "Kopieren",
     "lite_could_not_start": "Der Vorgang konnte nicht gestartet werden",
     "lite_could_not_write": "Konnte nicht schreiben ",
+    "lite_encrypt_offline_warning": "Wer die Wallet-Datei hat, kann Passphrasen offline durchprobieren. Sichern Sie zuerst Ihre Wiederherstellungsphrase und verwenden Sie eine lange Passphrase.",
     "lite_encrypt_wallet": "Wallet verschlüsseln",
     "lite_encryption_removed": "Verschlüsselung entfernt",
     "lite_enter_all_seed_words": "Alle 24 Seed-Wörter zur Wiederherstellung eingeben (%d erhalten)",
@@ -2059,6 +2061,7 @@
     "tt_keep_daemon": "Der Daemon wird beim Ausführen des Einrichtungsassistenten gestoppt",
     "tt_language": "Schnittstellensprache der Wallet-UI",
     "tt_layout_hotkey": "Hotkey: Links-/Rechts-Pfeiltasten zum Wechseln der Balance-Layouts",
+    "tt_lite_confirm_pass": "Geben Sie die neue Passphrase erneut ein; sie muss übereinstimmen und mindestens 8 Zeichen lang sein",
     "tt_lite_copy": "Das angezeigte Geheimnis in die Zwischenablage kopieren",
     "tt_lite_decrypt_pass": "Gib deine Passphrase ein, um die Verschlüsselung von der Wallet zu entfernen",
     "tt_lite_encrypt": "Die Wallet mit der obigen Passphrase verschlüsseln; sie wird sofort gesperrt und benötigt die Passphrase zum Entsperren",

res/lang/es.json

@@ -1008,11 +1008,13 @@
     "lite_birthday_backup": "Cumpleaños: %llu  (respalda esto también)",
     "lite_birthday_hint": "Altura de bloque desde la que empezar a escanear. Deja 0 si se desconoce (escaneo completo más lento).",
     "lite_birthday_label": "Fecha de creación",
+    "lite_confirm_label": "Confirmar",
     "lite_console_backend_commands": "Comandos del backend:",
     "lite_console_help_passthrough": "Cualquier otra entrada se ejecuta como un comando de consola de la cartera lite.",
     "lite_copy": "Copiar",
     "lite_could_not_start": "No se pudo iniciar la operación",
     "lite_could_not_write": "No se pudo escribir ",
+    "lite_encrypt_offline_warning": "Cualquiera que tenga el archivo de la cartera puede probar frases de contraseña sin conexión. Haz primero una copia de seguridad de tu frase de recuperación y usa una frase de contraseña larga.",
     "lite_encrypt_wallet": "Cifrar cartera",
     "lite_encryption_removed": "Cifrado eliminado",
     "lite_enter_all_seed_words": "Ingrese las 24 palabras semilla para restaurar (se obtuvieron %d)",
@@ -2059,6 +2061,7 @@
     "tt_keep_daemon": "El daemon se detendrá cuando ejecute el asistente de configuración",
     "tt_language": "Idioma de la interfaz de la billetera",
     "tt_layout_hotkey": "Atajo: teclas de flecha izquierda/derecha para cambiar diseños de Balance",
+    "tt_lite_confirm_pass": "Escribe de nuevo la nueva frase de contraseña; debe coincidir y tener al menos 8 caracteres",
     "tt_lite_copy": "Copia el secreto revelado al portapapeles",
     "tt_lite_decrypt_pass": "Introduce tu frase de contraseña para quitar el cifrado de la cartera",
     "tt_lite_encrypt": "Cifra la cartera con la frase de contraseña de arriba; se bloquea de inmediato y requiere la frase para desbloquearse",

res/lang/fr.json

@@ -1008,11 +1008,13 @@
     "lite_birthday_backup": "Date de création : %llu  (à sauvegarder également)",
     "lite_birthday_hint": "Hauteur de bloc à partir de laquelle commencer l'analyse. Laissez 0 si inconnue (analyse complète plus lente).",
     "lite_birthday_label": "Bloc de création",
+    "lite_confirm_label": "Confirmer",
     "lite_console_backend_commands": "Commandes du backend :",
     "lite_console_help_passthrough": "Toute autre entrée est exécutée comme une commande de la console du portefeuille lite.",
     "lite_copy": "Copier",
     "lite_could_not_start": "Impossible de démarrer l'opération",
     "lite_could_not_write": "Impossible d'écrire ",
+    "lite_encrypt_offline_warning": "Toute personne disposant du fichier du portefeuille peut essayer des phrases secrètes hors ligne. Sauvegardez d'abord votre phrase de récupération et utilisez une phrase secrète longue.",
     "lite_encrypt_wallet": "Chiffrer le portefeuille",
     "lite_encryption_removed": "Chiffrement supprimé",
     "lite_enter_all_seed_words": "Entrez les 24 mots de la phrase de récupération (%d obtenus)",
@@ -2059,6 +2061,7 @@
     "tt_keep_daemon": "Le daemon s'arrêtera lors de l'exécution de l'assistant de configuration",
     "tt_language": "Langue de l'interface du portefeuille",
     "tt_layout_hotkey": "Raccourci : touches fléchées gauche/droite pour changer les dispositions de Balance",
+    "tt_lite_confirm_pass": "Saisissez à nouveau la nouvelle phrase secrète ; elle doit correspondre et comporter au moins 8 caractères",
     "tt_lite_copy": "Copie le secret révélé dans le presse-papiers",
     "tt_lite_decrypt_pass": "Saisissez votre phrase de passe pour retirer le chiffrement du portefeuille",
     "tt_lite_encrypt": "Chiffre le portefeuille avec la phrase de passe ci-dessus ; il se verrouille immédiatement et requiert la phrase pour se déverrouiller",

res/lang/ja.json

@@ -1008,11 +1008,13 @@
     "lite_birthday_backup": "誕生日：%llu  (これもバックアップしてください)",
     "lite_birthday_hint": "スキャンを開始するブロック高。不明な場合は0のままにしてください（完全スキャンが遅くなります）。",
     "lite_birthday_label": "バースデー",
+    "lite_confirm_label": "確認",
     "lite_console_backend_commands": "バックエンドコマンド：",
     "lite_console_help_passthrough": "その他の入力はライトウォレットのコンソールコマンドとして実行されます。",
     "lite_copy": "コピー",
     "lite_could_not_start": "操作を開始できませんでした",
     "lite_could_not_write": "書き込めませんでした ",
+    "lite_encrypt_offline_warning": "ウォレットファイルを持つ人は誰でも、オフラインでパスフレーズを試せます。先にシードフレーズをバックアップし、長いパスフレーズを使ってください。",
     "lite_encrypt_wallet": "ウォレットを暗号化",
     "lite_encryption_removed": "暗号化を解除しました",
     "lite_enter_all_seed_words": "復元するには24個のシードワードをすべて入力してください（現在 %d 個）",
@@ -2059,6 +2061,7 @@
     "tt_keep_daemon": "セットアップウィザード実行時にデーモンは停止します",
     "tt_language": "ウォレット UI のインターフェース言語",
     "tt_layout_hotkey": "ホットキー：左右矢印キーでバランスレイアウトを切り替え",
+    "tt_lite_confirm_pass": "新しいパスフレーズをもう一度入力してください。一致し、8 文字以上である必要があります",
     "tt_lite_copy": "表示された秘密情報をクリップボードにコピーします",
     "tt_lite_decrypt_pass": "ウォレットの暗号化を解除するためにパスフレーズを入力します",
     "tt_lite_encrypt": "上のパスフレーズでウォレットを暗号化します。すぐにロックされ、解除にはパスフレーズが必要です",

res/lang/ko.json

@@ -1008,11 +1008,13 @@
     "lite_birthday_backup": "생성 블록: %llu  (이 값도 백업하세요)",
     "lite_birthday_hint": "스캔을 시작할 블록 높이입니다. 모르면 0으로 두세요(전체 스캔이 느려짐).",
     "lite_birthday_label": "생일 블록",
+    "lite_confirm_label": "확인",
     "lite_console_backend_commands": "백엔드 명령:",
     "lite_console_help_passthrough": "그 외 입력은 라이트 지갑 콘솔 명령으로 실행됩니다.",
     "lite_copy": "복사",
     "lite_could_not_start": "작업을 시작할 수 없습니다",
     "lite_could_not_write": "쓸 수 없습니다: ",
+    "lite_encrypt_offline_warning": "지갑 파일을 가진 사람은 누구나 오프라인으로 암호를 시도할 수 있습니다. 먼저 시드 문구를 백업하고 긴 암호를 사용하세요.",
     "lite_encrypt_wallet": "지갑 암호화",
     "lite_encryption_removed": "암호화가 제거되었습니다",
     "lite_enter_all_seed_words": "복구하려면 24개의 시드 단어를 모두 입력하세요 (현재 %d개)",
@@ -2059,6 +2061,7 @@
     "tt_keep_daemon": "설정 마법사를 실행하면 데몬이 여전히 중지됩니다",
     "tt_language": "지갑 UI 인터페이스 언어",
     "tt_layout_hotkey": "단축키: 좌/우 화살표 키로 잔액 레이아웃 전환",
+    "tt_lite_confirm_pass": "새 암호를 한 번 더 입력하세요. 일치해야 하며 8자 이상이어야 합니다",
     "tt_lite_copy": "표시된 비밀을 클립보드에 복사합니다",
     "tt_lite_decrypt_pass": "지갑에서 암호화를 제거하려면 암호를 입력하세요",
     "tt_lite_encrypt": "위 암호로 지갑을 암호화합니다; 즉시 잠기며 잠금 해제하려면 암호가 필요합니다",

res/lang/pt.json

@@ -1008,11 +1008,13 @@
     "lite_birthday_backup": "Aniversário: %llu  (faça o backup disto também)",
     "lite_birthday_hint": "Altura do bloco a partir da qual começar a escanear. Deixe 0 se desconhecida (escaneamento completo mais lento).",
     "lite_birthday_label": "Data de nascimento",
+    "lite_confirm_label": "Confirmar",
     "lite_console_backend_commands": "Comandos do backend:",
     "lite_console_help_passthrough": "Qualquer outra entrada é executada como um comando de console da carteira leve.",
     "lite_copy": "Copiar",
     "lite_could_not_start": "Não foi possível iniciar a operação",
     "lite_could_not_write": "Não foi possível gravar ",
+    "lite_encrypt_offline_warning": "Qualquer pessoa com o arquivo da carteira pode testar frases-passe offline. Faça primeiro o backup da sua frase de recuperação e use uma frase-passe longa.",
     "lite_encrypt_wallet": "Criptografar carteira",
     "lite_encryption_removed": "Criptografia removida",
     "lite_enter_all_seed_words": "Informe todas as 24 palavras-semente para restaurar (obtidas %d)",
@@ -2059,6 +2061,7 @@
     "tt_keep_daemon": "O daemon será parado ao executar o assistente de configuração",
     "tt_language": "Idioma da interface da carteira",
     "tt_layout_hotkey": "Atalho: teclas de seta esquerda/direita para alternar layouts de Saldo",
+    "tt_lite_confirm_pass": "Digite a nova frase-passe novamente; ela deve coincidir e ter pelo menos 8 caracteres",
     "tt_lite_copy": "Copiar o segredo revelado para a área de transferência",
     "tt_lite_decrypt_pass": "Digite sua frase-senha para remover a criptografia da carteira",
     "tt_lite_encrypt": "Criptografar a carteira com a frase-senha acima; ela é bloqueada imediatamente e exige a frase-senha para desbloquear",

res/lang/ru.json

@@ -1008,11 +1008,13 @@
     "lite_birthday_backup": "Дата рождения: %llu  (сохраните её тоже)",
     "lite_birthday_hint": "Высота блока, с которой начинать сканирование. Оставьте 0, если неизвестно (медленное полное сканирование).",
     "lite_birthday_label": "Дата рождения",
+    "lite_confirm_label": "Повтор",
     "lite_console_backend_commands": "Команды бэкенда:",
     "lite_console_help_passthrough": "Любой другой ввод выполняется как команда консоли лайт-кошелька.",
     "lite_copy": "Копировать",
     "lite_could_not_start": "Не удалось запустить операцию",
     "lite_could_not_write": "Не удалось записать ",
+    "lite_encrypt_offline_warning": "Любой, у кого есть файл кошелька, может подбирать парольные фразы офлайн. Сначала сохраните сид-фразу и используйте длинную парольную фразу.",
     "lite_encrypt_wallet": "Зашифровать кошелёк",
     "lite_encryption_removed": "Шифрование удалено",
     "lite_enter_all_seed_words": "Введите все 24 слова seed-фразы для восстановления (введено %d)",
@@ -2059,6 +2061,7 @@
     "tt_keep_daemon": "Демон будет остановлен при запуске мастера настройки",
     "tt_language": "Язык интерфейса кошелька",
     "tt_layout_hotkey": "Горячая клавиша: стрелки влево/вправо для переключения раскладок Баланса",
+    "tt_lite_confirm_pass": "Введите новую парольную фразу ещё раз; она должна совпадать и содержать не менее 8 символов",
     "tt_lite_copy": "Скопировать показанный секрет в буфер обмена",
     "tt_lite_decrypt_pass": "Введите пароль, чтобы снять шифрование с кошелька",
     "tt_lite_encrypt": "Зашифровать кошелёк паролем выше; он блокируется сразу же и требует пароль для разблокировки",

res/lang/zh.json

@@ -1008,11 +1008,13 @@
     "lite_birthday_backup": "生日区块：%llu （也请一并备份）",
     "lite_birthday_hint": "开始扫描的区块高度。如未知请保留 0（完整扫描更慢）。",
     "lite_birthday_label": "诞生区块",
+    "lite_confirm_label": "确认",
     "lite_console_backend_commands": "后端命令：",
     "lite_console_help_passthrough": "其他任何输入都将作为轻钱包控制台命令运行。",
     "lite_copy": "复制",
     "lite_could_not_start": "无法启动该操作",
     "lite_could_not_write": "无法写入 ",
+    "lite_encrypt_offline_warning": "任何拿到钱包文件的人都可以离线尝试密码。请先备份助记词，并使用较长的密码短语。",
     "lite_encrypt_wallet": "加密钱包",
     "lite_encryption_removed": "已移除加密",
     "lite_enter_all_seed_words": "请输入全部 24 个助记词以恢复（已输入 %d 个）",
@@ -2059,6 +2061,7 @@
     "tt_keep_daemon": "运行设置向导时守护进程仍会停止",
     "tt_language": "钱包界面语言",
     "tt_layout_hotkey": "快捷键：左/右箭头键切换余额布局",
+    "tt_lite_confirm_pass": "再次输入新的密码短语；两次输入必须一致，且至少 8 个字符",
     "tt_lite_copy": "将显示的机密复制到剪贴板",
     "tt_lite_decrypt_pass": "输入你的密码以移除钱包的加密",
     "tt_lite_encrypt": "用上方的密码加密钱包；加密后立即锁定，需要该密码才能解锁",