feat(settings): migrate Backup Wallet modal to the reference design

Phase 1. Struct-form BlurFloat overlay (was the legacy positional overload);
DialogWarningHeader care header; centered DialogActionFooter (Create Backup +
Close) replacing the StyledButtons + separator; full i18n — title/destination/
button reuse existing backup_* keys, plus two new keys (backup_warn one-line care
line, backup_overwrite_confirm) added in en + 8 langs. No change to backupWallet.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

res/lang/de.json

@@ -62,6 +62,7 @@
     "backup_data": "SICHERUNG & DATEN",
     "backup_description": "Erstellen Sie eine Sicherung Ihrer wallet.dat-Datei. Diese Datei enthält alle Ihre privaten Schlüssel und den Transaktionsverlauf. Bewahren Sie die Sicherung an einem sicheren Ort auf.",
     "backup_destination": "Sicherungsziel:",
+    "backup_overwrite_confirm": "Dort existiert bereits eine Datei — erneut speichern, um sie zu überschreiben.",
     "backup_source": "Quelle: %s",
     "backup_tip_external": "Speichern Sie Sicherungen auf externen Laufwerken oder Cloud-Speicher",
     "backup_tip_multiple": "Erstellen Sie mehrere Sicherungen an verschiedenen Orten",
@@ -70,6 +71,7 @@
     "backup_title": "Wallet sichern",
     "backup_wallet": "Wallet sichern...",
     "backup_wallet_not_found": "Warnung: wallet.dat nicht am erwarteten Speicherort gefunden",
+    "backup_warn": "Diese Datei enthält alle Ihre privaten Schlüssel — bewahren Sie sie sicher auf.",
     "balance": "Guthaben",
     "balance_history_collecting": "Guthabenverlauf — Daten werden gesammelt...",
     "balance_layout": "Guthaben-Layout",

res/lang/es.json

@@ -62,6 +62,7 @@
     "backup_data": "RESPALDO Y DATOS",
     "backup_description": "Crea un respaldo de tu archivo wallet.dat. Este archivo contiene todas tus claves privadas e historial de transacciones. Guarda el respaldo en un lugar seguro.",
     "backup_destination": "Destino del respaldo:",
+    "backup_overwrite_confirm": "Ya existe un archivo ahí: guarda de nuevo para sobrescribirlo.",
     "backup_source": "Origen: %s",
     "backup_tip_external": "Guarda respaldos en unidades externas o almacenamiento en la nube",
     "backup_tip_multiple": "Crea múltiples respaldos en diferentes ubicaciones",
@@ -70,6 +71,7 @@
     "backup_title": "Respaldar Cartera",
     "backup_wallet": "Respaldar Cartera...",
     "backup_wallet_not_found": "Advertencia: wallet.dat no encontrado en la ubicación esperada",
+    "backup_warn": "Este archivo contiene todas tus claves privadas: guárdalo en un lugar seguro.",
     "balance": "Saldo",
     "balance_history_collecting": "Historial de saldo — recopilando datos...",
     "balance_layout": "Diseño de Saldo",

res/lang/fr.json

@@ -62,6 +62,7 @@
     "backup_data": "SAUVEGARDE & DONNÉES",
     "backup_description": "Créez une sauvegarde de votre fichier wallet.dat. Ce fichier contient toutes vos clés privées et l'historique des transactions. Conservez la sauvegarde dans un endroit sûr.",
     "backup_destination": "Destination de sauvegarde :",
+    "backup_overwrite_confirm": "Un fichier existe déjà là — enregistrez à nouveau pour l'écraser.",
     "backup_source": "Source : %s",
     "backup_tip_external": "Stockez les sauvegardes sur des disques externes ou un stockage cloud",
     "backup_tip_multiple": "Créez plusieurs sauvegardes à différents endroits",
@@ -70,6 +71,7 @@
     "backup_title": "Sauvegarder le portefeuille",
     "backup_wallet": "Sauvegarder le portefeuille...",
     "backup_wallet_not_found": "Attention : wallet.dat introuvable à l'emplacement prévu",
+    "backup_warn": "Ce fichier contient toutes vos clés privées — conservez-le en lieu sûr.",
     "balance": "Solde",
     "balance_history_collecting": "Historique du solde — collecte des données...",
     "balance_layout": "Disposition du solde",

res/lang/ja.json

@@ -62,6 +62,7 @@
     "backup_data": "バックアップとデータ",
     "backup_description": "wallet.datファイルのバックアップを作成します。このファイルにはすべての秘密鍵と取引履歴が含まれています。バックアップは安全な場所に保管してください。",
     "backup_destination": "バックアップ先：",
+    "backup_overwrite_confirm": "そこには既にファイルがあります。もう一度保存すると上書きされます。",
     "backup_source": "ソース：%s",
     "backup_tip_external": "外部ドライブまたはクラウドストレージにバックアップを保存",
     "backup_tip_multiple": "異なる場所に複数のバックアップを作成",
@@ -70,6 +71,7 @@
     "backup_title": "ウォレットのバックアップ",
     "backup_wallet": "ウォレットをバックアップ...",
     "backup_wallet_not_found": "警告：予想される場所にwallet.datが見つかりません",
+    "backup_warn": "このファイルにはすべての秘密鍵が含まれています。安全な場所に保管してください。",
     "balance": "残高",
     "balance_history_collecting": "残高履歴 — データを収集中...",
     "balance_layout": "残高レイアウト",

res/lang/ko.json

@@ -62,6 +62,7 @@
     "backup_data": "백업 및 데이터",
     "backup_description": "wallet.dat 파일의 백업을 생성합니다. 이 파일에는 모든 개인 키와 거래 내역이 포함되어 있습니다. 백업을 안전한 곳에 보관하세요.",
     "backup_destination": "백업 위치:",
+    "backup_overwrite_confirm": "그곳에 이미 파일이 있습니다. 다시 저장하면 덮어씁니다.",
     "backup_source": "소스: %s",
     "backup_tip_external": "외장 드라이브 또는 클라우드 스토리지에 백업 저장",
     "backup_tip_multiple": "서로 다른 위치에 여러 백업 생성",
@@ -70,6 +71,7 @@
     "backup_title": "지갑 백업",
     "backup_wallet": "지갑 백업...",
     "backup_wallet_not_found": "경고: 예상 위치에서 wallet.dat를 찾을 수 없습니다",
+    "backup_warn": "이 파일에는 모든 개인 키가 들어 있습니다. 안전한 곳에 보관하세요.",
     "balance": "잔액",
     "balance_history_collecting": "잔액 내역 — 데이터 수집 중...",
     "balance_layout": "잔액 레이아웃",

res/lang/pt.json

@@ -62,6 +62,7 @@
     "backup_data": "BACKUP & DADOS",
     "backup_description": "Crie um backup do seu arquivo wallet.dat. Este arquivo contém todas as suas chaves privadas e histórico de transações. Guarde o backup em um local seguro.",
     "backup_destination": "Destino do backup:",
+    "backup_overwrite_confirm": "Já existe um arquivo ali — salve novamente para sobrescrevê-lo.",
     "backup_source": "Origem: %s",
     "backup_tip_external": "Armazene backups em unidades externas ou armazenamento em nuvem",
     "backup_tip_multiple": "Crie múltiplos backups em diferentes locais",
@@ -70,6 +71,7 @@
     "backup_title": "Backup da Carteira",
     "backup_wallet": "Fazer Backup da Carteira...",
     "backup_wallet_not_found": "Aviso: wallet.dat não encontrado no local esperado",
+    "backup_warn": "Este arquivo contém todas as suas chaves privadas — guarde-o em local seguro.",
     "balance": "Saldo",
     "balance_history_collecting": "Histórico de saldo — coletando dados...",
     "balance_layout": "Layout do Saldo",

res/lang/ru.json

@@ -62,6 +62,7 @@
     "backup_data": "РЕЗЕРВНОЕ КОПИРОВАНИЕ И ДАННЫЕ",
     "backup_description": "Создайте резервную копию файла wallet.dat. Этот файл содержит все ваши приватные ключи и историю транзакций. Храните копию в безопасном месте.",
     "backup_destination": "Место сохранения:",
+    "backup_overwrite_confirm": "Там уже есть файл — сохраните ещё раз, чтобы перезаписать его.",
     "backup_source": "Источник: %s",
     "backup_tip_external": "Храните резервные копии на внешних дисках или в облаке",
     "backup_tip_multiple": "Создавайте несколько копий в разных местах",
@@ -70,6 +71,7 @@
     "backup_title": "Резервное копирование кошелька",
     "backup_wallet": "Создать резервную копию...",
     "backup_wallet_not_found": "Предупреждение: wallet.dat не найден в ожидаемом расположении",
+    "backup_warn": "Этот файл содержит все ваши приватные ключи — храните его в надёжном месте.",
     "balance": "Баланс",
     "balance_history_collecting": "История баланса — сбор данных...",
     "balance_layout": "Макет баланса",

res/lang/zh.json

@@ -62,6 +62,7 @@
     "backup_data": "备份与数据",
     "backup_description": "创建 wallet.dat 文件的备份。此文件包含您所有的私钥和交易历史。请将备份存放在安全的地方。",
     "backup_destination": "备份目标：",
+    "backup_overwrite_confirm": "该位置已存在文件，再次保存将覆盖它。",
     "backup_source": "来源：%s",
     "backup_tip_external": "将备份存储在外部驱动器或云存储中",
     "backup_tip_multiple": "在不同位置创建多个备份",
@@ -70,6 +71,7 @@
     "backup_title": "备份钱包",
     "backup_wallet": "备份钱包...",
     "backup_wallet_not_found": "警告：在预期位置未找到 wallet.dat",
+    "backup_warn": "此文件包含您的所有私钥，请妥善保管。",
     "balance": "余额",
     "balance_history_collecting": "余额历史——正在收集数据…",
     "balance_layout": "余额布局",

src/app.cpp

@@ -3271,42 +3271,44 @@ void App::renderExportKeyDialog()
 
 void App::renderBackupDialog()
 {
-    auto dlg = ui::schema::UI().drawElement("inline-dialogs", "backup");
+    namespace m = ui::material;
-    auto dlgF = [&](const char* key, float fb) -> float {
-        auto it = dlg.extraFloats.find(key);
-        return it != dlg.extraFloats.end() ? it->second : fb;
-    };
-    int btnFont = (int)dlgF("button-font", 1);
-    float btnW = dlgF("button-width", 120.0f);
 
-    if (!ui::material::BeginOverlayDialog("Backup Wallet", &show_backup_, dlgF("width", 500.0f), 0.94f)) {
+    m::OverlayDialogSpec ov;
-        return;
+    ov.title     = TR("backup_title");
-    }
+    ov.p_open    = &show_backup_;
+    ov.style     = m::OverlayStyle::BlurFloat;
+    ov.cardWidth = 560.0f;
+    ov.idSuffix  = "backup";
+    if (!m::BeginOverlayDialog(ov)) return;
 
-    ImGui::TextWrapped("Export all private keys to a file. Keep this file secure!");
+    m::DialogWarningHeader(TR("backup_warn"));
     ImGui::Spacing();
 
-    ImGui::Text("Backup File Path:");
     static char backup_path[512] = "dragonx-backup.txt";
     static bool s_backup_confirm_overwrite = false;
+    ImGui::TextUnformatted(TR("backup_destination"));
     ImGui::SetNextItemWidth(-1);
     if (ImGui::InputText("##backuppath", backup_path, sizeof(backup_path)))
         s_backup_confirm_overwrite = false;   // path edited — re-check overwrite on next Save
 
-    ImGui::Spacing();
-    
     if (!backup_status_.empty()) {
-        if (backup_success_) {
+        ImGui::Spacing();
-            ImGui::TextColored(ui::material::SuccessVec4(), "%s", backup_status_.c_str());
+        ImGui::PushTextWrapPos(0.0f);
-        } else {
+        ImGui::TextColored(backup_success_ ? m::SuccessVec4() : ImVec4(0.8f, 0.3f, 0.3f, 1.0f),
-            ImGui::TextColored(ImVec4(0.8f, 0.3f, 0.3f, 1.0f), "%s", backup_status_.c_str());
+                           "%s", backup_status_.c_str());
-        }
+        ImGui::PopTextWrapPos();
     }
 
     ImGui::Spacing();
-    ImGui::Separator();
 
-    if (ui::material::StyledButton("Save Backup", ImVec2(btnW, 0), ui::material::resolveButtonFont(btnFont))) {
+    bool doSave = false, doClose = false;
+    m::DialogActionFooter(TR("backup_create"), true, TR("close"), doSave, doClose);
+    if (doClose) {
+        show_backup_ = false;
+        backup_status_.clear();
+        s_backup_confirm_overwrite = false;
+    }
+    if (doSave) {
         std::string path(backup_path);
         // Trim surrounding whitespace (a pasted path can carry a trailing newline).
         while (!path.empty() && (path.front()==' '||path.front()=='\t'||path.front()=='\n'||path.front()=='\r')) path.erase(path.begin());
@@ -3317,7 +3319,7 @@ void App::renderBackupDialog()
                 // Don't clobber an existing file (possibly a good earlier backup) without confirmation.
                 s_backup_confirm_overwrite = true;
                 backup_success_ = false;
-                backup_status_ = "A file already exists there — click Save Backup again to overwrite it.";
+                backup_status_ = TR("backup_overwrite_confirm");
             } else {
                 s_backup_confirm_overwrite = false;
                 backupWallet(path, [this](bool success, const std::string& msg) {
@@ -3327,14 +3329,8 @@ void App::renderBackupDialog()
             }
         }
     }
-    ImGui::SameLine();
-    if (ui::material::StyledButton("Close", ImVec2(btnW, 0), ui::material::resolveButtonFont(btnFont))) {
-        show_backup_ = false;
-        backup_status_.clear();
-        s_backup_confirm_overwrite = false;
-    }
 
-    ui::material::EndOverlayDialog();
+    m::EndOverlayDialog();
 }
 
 void App::maybeOfferDaemonUpdate()

src/util/i18n.cpp

@@ -1202,6 +1202,8 @@ void I18n::loadBuiltinEnglish()
         strings_["backup_created"] = "Wallet backup created";
         strings_["backup_description"] = "Create a backup of your wallet.dat file. This file contains all your private keys and transaction history. Store the backup in a secure location.";
         strings_["backup_destination"] = "Backup destination:";
+        strings_["backup_warn"] = "This file holds all your private keys \xE2\x80\x94 keep it somewhere safe.";
+        strings_["backup_overwrite_confirm"] = "A file already exists there \xE2\x80\x94 Save again to overwrite it.";
         strings_["backup_tip_external"] = "Store backups on external drives or cloud storage";
         strings_["backup_tip_multiple"] = "Create multiple backups in different locations";
         strings_["backup_tip_test"] = "Test restoring from backup periodically";