perf(net): hold wallet scans at connect, in the background and on tab entry

- Connect gate: after the node starts answering, wallet scans wait until the
  lock state is known and the node knows its tip (or the wallet has fewer
  than 500 transactions), at most 20 s. A node already behind latches the
  sync profile from the connect's getinfo. Meanwhile a list-only pass keeps
  the address list and the cached history up, and the session's first
  balance and per-address balances are read once even while catching up,
  so the wallet shows its last-synced values instead of 0.
- Background: minimized, hidden, or covered without focus (3 s debounce,
  any input cancels) polls only the chain state every 15 s. Wallet scans,
  the mining poll, price, nudges and auto-lock interaction tracking pause;
  auto-lock now fires while minimized. Leaving a held profile marks every
  timer due again.
- Tab entry marks the timers due instead of forcing scans; a stale list or
  a never-loaded history still loads on entry.
- The scan entry points own the hard gates, failed enumerations keep the
  previous lists behind a retry hold, and failed balance calls never
  overwrite known balances with 0.

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

res/lang/de.json

@@ -1561,6 +1561,7 @@
     "reduce_motion": "Bewegung reduzieren",
     "refresh": "Aktualisieren",
     "refresh_now": "Jetzt aktualisieren",
+    "refresh_waits_for_sync": "Der Knoten synchronisiert noch. Die Wallet-Daten werden aktualisiert, sobald er fertig ist.",
     "remove_favorite": "Favorit entfernen",
     "repair_wallet": "Wallet reparieren",
     "report_bug": "Fehler melden",
@@ -2127,6 +2128,7 @@
     "tx_loading_queued": "Transaktionsaktualisierung in der Warteschlange",
     "tx_loading_refreshing_cached": "Wallet-Verlauf wird aktualisiert (%d zwischengespeichert)",
     "tx_loading_scanning_shielded": "Abgeschirmter Verlauf wird gescannt (%d Adressen)",
+    "tx_loading_waits_for_sync": "Der Verlauf wird aktualisiert, sobald der Knoten fertig synchronisiert ist",
     "tx_mined": "GEMINED",
     "tx_progress_balances": "Guthaben wird aktualisiert",
     "tx_progress_finalizing": "Transaktion wird abgeschlossen",

res/lang/es.json

@@ -1561,6 +1561,7 @@
     "reduce_motion": "Reducir Movimiento",
     "refresh": "Actualizar",
     "refresh_now": "Actualizar Ahora",
+    "refresh_waits_for_sync": "El nodo aún se está sincronizando. Los datos de la cartera se actualizarán cuando termine.",
     "remove_favorite": "Quitar favorito",
     "repair_wallet": "Reparar cartera",
     "report_bug": "Reportar Error",
@@ -2127,6 +2128,7 @@
     "tx_loading_queued": "Actualización de transacciones en cola",
     "tx_loading_refreshing_cached": "Actualizando el historial de la cartera (%d en caché)",
     "tx_loading_scanning_shielded": "Escaneando historial protegido (%d direcciones)",
+    "tx_loading_waits_for_sync": "El historial se actualizará cuando el nodo termine de sincronizarse",
     "tx_mined": "MINADO",
     "tx_progress_balances": "Actualizando saldos",
     "tx_progress_finalizing": "Finalizando transacción",

res/lang/fr.json

@@ -1561,6 +1561,7 @@
     "reduce_motion": "Réduire les animations",
     "refresh": "Actualiser",
     "refresh_now": "Actualiser maintenant",
+    "refresh_waits_for_sync": "Le nœud est encore en cours de synchronisation. Les données du portefeuille seront actualisées une fois celle-ci terminée.",
     "remove_favorite": "Retirer des favoris",
     "repair_wallet": "Réparer le portefeuille",
     "report_bug": "Signaler un bug",
@@ -2127,6 +2128,7 @@
     "tx_loading_queued": "Actualisation des transactions en file d'attente",
     "tx_loading_refreshing_cached": "Actualisation de l'historique du portefeuille (%d en cache)",
     "tx_loading_scanning_shielded": "Analyse de l'historique blindé (%d adresses)",
+    "tx_loading_waits_for_sync": "L'historique sera mis à jour une fois le nœud synchronisé",
     "tx_mined": "MINÉ",
     "tx_progress_balances": "Actualisation des soldes",
     "tx_progress_finalizing": "Finalisation de la transaction",

res/lang/ja.json

@@ -1561,6 +1561,7 @@
     "reduce_motion": "モーションを減らす",
     "refresh": "更新",
     "refresh_now": "今すぐ更新",
+    "refresh_waits_for_sync": "ノードはまだ同期中です。同期が完了するとウォレットのデータが更新されます。",
     "remove_favorite": "お気に入りを削除",
     "repair_wallet": "ウォレットを修復",
     "report_bug": "バグを報告",
@@ -2127,6 +2128,7 @@
     "tx_loading_queued": "取引の更新を待機中",
     "tx_loading_refreshing_cached": "ウォレット履歴を更新中（%d 件キャッシュ済み）",
     "tx_loading_scanning_shielded": "シールド履歴をスキャン中 (%d アドレス)",
+    "tx_loading_waits_for_sync": "ノードの同期が完了すると履歴が更新されます",
     "tx_mined": "採掘済み",
     "tx_progress_balances": "残高を更新中",
     "tx_progress_finalizing": "トランザクションを確定中",

res/lang/ko.json

@@ -1561,6 +1561,7 @@
     "reduce_motion": "모션 줄이기",
     "refresh": "새로고침",
     "refresh_now": "지금 새로고침",
+    "refresh_waits_for_sync": "노드가 아직 동기화 중입니다. 동기화가 끝나면 지갑 데이터가 새로고침됩니다.",
     "remove_favorite": "즐겨찾기 제거",
     "repair_wallet": "지갑 복구",
     "report_bug": "버그 신고",
@@ -2127,6 +2128,7 @@
     "tx_loading_queued": "거래 새로고침 대기 중",
     "tx_loading_refreshing_cached": "지갑 내역을 새로고침하는 중 (%d개 캐시됨)",
     "tx_loading_scanning_shielded": "차폐 내역 스캔 중 (%d개 주소)",
+    "tx_loading_waits_for_sync": "노드 동기화가 끝나면 내역이 업데이트됩니다",
     "tx_mined": "채굴됨",
     "tx_progress_balances": "잔액을 새로 고치는 중",
     "tx_progress_finalizing": "트랜잭션 마무리 중",

res/lang/pt.json

@@ -1561,6 +1561,7 @@
     "reduce_motion": "Reduzir Movimento",
     "refresh": "Atualizar",
     "refresh_now": "Atualizar Agora",
+    "refresh_waits_for_sync": "O nó ainda está sincronizando. Os dados da carteira serão atualizados quando terminar.",
     "remove_favorite": "Remover favorito",
     "repair_wallet": "Reparar Carteira",
     "report_bug": "Reportar Bug",
@@ -2127,6 +2128,7 @@
     "tx_loading_queued": "Atualização de transação na fila",
     "tx_loading_refreshing_cached": "Atualizando histórico da carteira (%d em cache)",
     "tx_loading_scanning_shielded": "Verificando histórico blindado (%d endereços)",
+    "tx_loading_waits_for_sync": "O histórico será atualizado quando o nó terminar de sincronizar",
     "tx_mined": "MINERADO",
     "tx_progress_balances": "Atualizando saldos",
     "tx_progress_finalizing": "Finalizando transação",

res/lang/ru.json

@@ -1561,6 +1561,7 @@
     "reduce_motion": "Уменьшить анимацию",
     "refresh": "Обновить",
     "refresh_now": "Обновить сейчас",
+    "refresh_waits_for_sync": "Узел ещё синхронизируется. Данные кошелька обновятся после её завершения.",
     "remove_favorite": "Удалить из избранного",
     "repair_wallet": "Восстановить кошелёк",
     "report_bug": "Сообщить об ошибке",
@@ -2127,6 +2128,7 @@
     "tx_loading_queued": "Обновление транзакций поставлено в очередь",
     "tx_loading_refreshing_cached": "Обновление истории кошелька (в кеше: %d)",
     "tx_loading_scanning_shielded": "Сканирование экранированной истории (%d адресов)",
+    "tx_loading_waits_for_sync": "История обновится, когда узел завершит синхронизацию",
     "tx_mined": "ДОБЫТА",
     "tx_progress_balances": "Обновление балансов",
     "tx_progress_finalizing": "Завершение транзакции",

res/lang/zh.json

@@ -1561,6 +1561,7 @@
     "reduce_motion": "减少动画",
     "refresh": "刷新",
     "refresh_now": "立即刷新",
+    "refresh_waits_for_sync": "节点仍在同步。同步完成后将刷新钱包数据。",
     "remove_favorite": "移除收藏",
     "repair_wallet": "修复钱包",
     "report_bug": "报告错误",
@@ -2127,6 +2128,7 @@
     "tx_loading_queued": "已排队的交易刷新",
     "tx_loading_refreshing_cached": "正在刷新钱包历史（已缓存 %d 条）",
     "tx_loading_scanning_shielded": "正在扫描屏蔽历史（%d 个地址）",
+    "tx_loading_waits_for_sync": "节点同步完成后将更新历史记录",
     "tx_mined": "已挖得",
     "tx_progress_balances": "正在刷新余额",
     "tx_progress_finalizing": "正在完成交易",