feat(ui): migrate Explorer detail/loading + daemon-update prompt to reference design

Presentation-only reference-design migration:
- Explorer loading modal -> struct-form overlay (idSuffix explorerloading); block-
  detail modal loses its header divider; the search button + the prev/next nav
  become TactileButton; TR() the hardcoded "Previous block"/"Next block" tooltips,
  "TxID:", and the "shielded" output fallback (3 new explorer_* keys + reuse the
  existing `shielded` key), all 8 langs. Block-fetch RPC path untouched.
- Daemon-update startup prompt -> struct-form overlay (idSuffix daemonupdprompt),
  2 StyledButton -> TactileButton, drop the footer divider. The reinstall/
  prompted-size persistence logic is unchanged.

Build + ctest + hygiene clean; "DRGX" ticker left hardcoded per convention.

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

res/lang/de.json

@@ -386,13 +386,16 @@
     "explorer_mempool": "Mempool",
     "explorer_mempool_size": "Größe",
     "explorer_mempool_txs": "Transaktionen",
+    "explorer_next_block": "Nächster Block",
     "explorer_no_results": "Keine passenden zwischengespeicherten Blöcke",
     "explorer_not_connected": "Nicht mit dem Daemon verbunden — Block- oder Transaktions-Hash kann nicht nachgeschlagen werden",
+    "explorer_prev_block": "Vorheriger Block",
     "explorer_recent_blocks": "Letzte Blöcke",
     "explorer_search": "Suchen",
     "explorer_section": "EXPLORER",
     "explorer_tx_outputs": "Ausgaben",
     "explorer_tx_size": "Größe",
+    "explorer_txid": "TxID:",
     "export": "Exportieren",
     "export_csv": "CSV exportieren",
     "export_keys_btn": "Schlüssel exportieren",

res/lang/es.json

@@ -386,13 +386,16 @@
     "explorer_mempool": "Mempool",
     "explorer_mempool_size": "Tamaño",
     "explorer_mempool_txs": "Transacciones",
+    "explorer_next_block": "Bloque siguiente",
     "explorer_no_results": "No hay bloques en caché que coincidan",
     "explorer_not_connected": "Sin conexión al daemon: no se puede buscar un bloque ni un hash de transacción",
+    "explorer_prev_block": "Bloque anterior",
     "explorer_recent_blocks": "Bloques Recientes",
     "explorer_search": "Buscar",
     "explorer_section": "EXPLORADOR",
     "explorer_tx_outputs": "Salidas",
     "explorer_tx_size": "Tamaño",
+    "explorer_txid": "TxID:",
     "export": "Exportar",
     "export_csv": "Exportar CSV",
     "export_keys_btn": "Exportar Claves",

res/lang/fr.json

@@ -386,13 +386,16 @@
     "explorer_mempool": "Mempool",
     "explorer_mempool_size": "Taille",
     "explorer_mempool_txs": "Transactions",
+    "explorer_next_block": "Bloc suivant",
     "explorer_no_results": "Aucun bloc en cache correspondant",
     "explorer_not_connected": "Non connecté au daemon — impossible de rechercher un hash de bloc ou de transaction",
+    "explorer_prev_block": "Bloc précédent",
     "explorer_recent_blocks": "Blocs récents",
     "explorer_search": "Rechercher",
     "explorer_section": "EXPLORATEUR",
     "explorer_tx_outputs": "Sorties",
     "explorer_tx_size": "Taille",
+    "explorer_txid": "TxID :",
     "export": "Exporter",
     "export_csv": "Exporter en CSV",
     "export_keys_btn": "Exporter les clés",

res/lang/ja.json

@@ -386,13 +386,16 @@
     "explorer_mempool": "メモリプール",
     "explorer_mempool_size": "サイズ",
     "explorer_mempool_txs": "トランザクション",
+    "explorer_next_block": "次のブロック",
     "explorer_no_results": "一致するキャッシュ済みブロックがありません",
     "explorer_not_connected": "デーモンに未接続 — ブロックまたはトランザクションハッシュを検索できません",
+    "explorer_prev_block": "前のブロック",
     "explorer_recent_blocks": "最近のブロック",
     "explorer_search": "検索",
     "explorer_section": "エクスプローラー",
     "explorer_tx_outputs": "出力",
     "explorer_tx_size": "サイズ",
+    "explorer_txid": "TxID：",
     "export": "エクスポート",
     "export_csv": "CSVエクスポート",
     "export_keys_btn": "鍵をエクスポート",

res/lang/ko.json

@@ -386,13 +386,16 @@
     "explorer_mempool": "멤풀",
     "explorer_mempool_size": "크기",
     "explorer_mempool_txs": "트랜잭션",
+    "explorer_next_block": "다음 블록",
     "explorer_no_results": "일치하는 캐시된 블록이 없습니다",
     "explorer_not_connected": "데몬에 연결되지 않음 — 블록 또는 트랜잭션 해시를 조회할 수 없습니다",
+    "explorer_prev_block": "이전 블록",
     "explorer_recent_blocks": "최근 블록",
     "explorer_search": "검색",
     "explorer_section": "탐색기",
     "explorer_tx_outputs": "출력",
     "explorer_tx_size": "크기",
+    "explorer_txid": "TxID:",
     "export": "내보내기",
     "export_csv": "CSV 내보내기",
     "export_keys_btn": "키 내보내기",

res/lang/pt.json

@@ -386,13 +386,16 @@
     "explorer_mempool": "Mempool",
     "explorer_mempool_size": "Tamanho",
     "explorer_mempool_txs": "Transações",
+    "explorer_next_block": "Próximo bloco",
     "explorer_no_results": "Nenhum bloco em cache correspondente",
     "explorer_not_connected": "Não conectado ao daemon — não é possível procurar um bloco ou hash de transação",
+    "explorer_prev_block": "Bloco anterior",
     "explorer_recent_blocks": "Blocos Recentes",
     "explorer_search": "Pesquisar",
     "explorer_section": "EXPLORADOR",
     "explorer_tx_outputs": "Saídas",
     "explorer_tx_size": "Tamanho",
+    "explorer_txid": "TxID:",
     "export": "Exportar",
     "export_csv": "Exportar CSV",
     "export_keys_btn": "Exportar Chaves",

res/lang/ru.json

@@ -386,13 +386,16 @@
     "explorer_mempool": "Мемпул",
     "explorer_mempool_size": "Размер",
     "explorer_mempool_txs": "Транзакции",
+    "explorer_next_block": "Следующий блок",
     "explorer_no_results": "Нет подходящих кэшированных блоков",
     "explorer_not_connected": "Нет подключения к демону — невозможно найти хеш блока или транзакции",
+    "explorer_prev_block": "Предыдущий блок",
     "explorer_recent_blocks": "Последние блоки",
     "explorer_search": "Поиск",
     "explorer_section": "ОБОЗРЕВАТЕЛЬ",
     "explorer_tx_outputs": "Выходы",
     "explorer_tx_size": "Размер",
+    "explorer_txid": "TxID:",
     "export": "Экспорт",
     "export_csv": "Экспорт в CSV",
     "export_keys_btn": "Экспорт ключей",

res/lang/zh.json

@@ -386,13 +386,16 @@
     "explorer_mempool": "内存池",
     "explorer_mempool_size": "大小",
     "explorer_mempool_txs": "交易",
+    "explorer_next_block": "下一个区块",
     "explorer_no_results": "没有匹配的缓存区块",
     "explorer_not_connected": "未连接到守护进程——无法查询区块或交易哈希",
+    "explorer_prev_block": "上一个区块",
     "explorer_recent_blocks": "最近区块",
     "explorer_search": "搜索",
     "explorer_section": "浏览器",
     "explorer_tx_outputs": "输出",
     "explorer_tx_size": "大小",
+    "explorer_txid": "TxID：",
     "export": "导出",
     "export_csv": "导出 CSV",
     "export_keys_btn": "导出密钥",