fix(daemon): never restart, delete or swap under a node that hasn't exited

Every operation that stops the node (restart, rescan, repair, delete
chain data, reinstall, bootstrap, wallet switch/adopt/restore/rebuild,
wizard restart, encrypt, decrypt) now:

- refuses up front while the node is rebuilding witnesses or has not
  answered for 30s, with a "try again when it's done" warning, and sends
  no stop;
- goes ahead only once the node's PROCESS has exited, not its RPC port.
  A stop that doesn't finish within 120s cancels the operation (warning;
  a cancelled rescan/repair disarms its flags); nothing is started over
  the old node, chain data isn't deleted, wallet.dat isn't swapped.

Specifics:
- stopDaemonForWalletSwitch() no longer reports "stopped" when the app
  is quitting (adopt could swap wallet.dat under a live node).
- Decrypt waited a fixed 3s after "stop" before renaming wallet.dat; it
  now waits for the process to exit, and scrubs the key export if not.
- Bootstrap waits for the process before cleanChainData and stops the
  node through the stop routine instead of the shared RPC client.
- StopScope::Connected lets switch/reinstall/decrypt stop an adopted or
  external node through the same never-kill routine.
- A bounded stop that can't reach the node (a foreign node refusing our
  credentials) gives up after 5s instead of 120s.
- macOS: isDaemonProcessRunning() checks processes (libproc), not the
  RPC port.
- rpcBusyWhileAlive() also reads the busy gate: since the gate, the
  first timeout usually lands on another lane and the 30s clock never
  started (also weakened the quit prompt for a silent rebuild).
- Notifications render during the first-run wizard.

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

scripts/add_missing_translations.py

@@ -25,6 +25,26 @@ def load_english_keys():
 
 # All translations for the 158 missing keys
 TRANSLATIONS = {
+    "appx_node_busy_try_later": {
+        "de": "Der Node ist mit einer langen Aufgabe beschäftigt (etwa dem Neuaufbau der Note-Witnesses). Versuchen Sie es erneut, wenn sie abgeschlossen ist; ein Stoppen jetzt könnte diese Arbeit von vorn beginnen lassen.",
+        "es": "El nodo está ocupado terminando una tarea larga (como reconstruir los testigos de notas). Vuelve a intentarlo cuando termine; detenerlo ahora podría hacer que empiece ese trabajo de nuevo.",
+        "fr": "Le nœud termine une longue tâche (comme la reconstruction des témoins de notes). Réessayez une fois qu'elle est finie ; l'arrêter maintenant pourrait lui faire recommencer ce travail.",
+        "pt": "O nó está ocupado concluindo uma tarefa longa (como reconstruir as testemunhas de notas). Tente novamente quando terminar; pará-lo agora pode fazê-lo recomeçar esse trabalho.",
+        "ru": "Узел занят долгой задачей (например, перестройкой свидетелей заметок). Повторите попытку, когда она завершится; если остановить его сейчас, эту работу, возможно, придётся начать заново.",
+        "zh": "节点正忙于完成一项耗时任务（例如重建票据见证）。请在完成后重试；现在停止它可能导致这项工作从头开始。",
+        "ja": "ノードは長時間の処理（ノートウィットネスの再構築など）を実行中です。完了してからもう一度お試しください。今停止すると、その処理を最初からやり直すことがあります。",
+        "ko": "노드가 긴 작업(노트 위트니스 재구성 등)을 마무리하는 중입니다. 끝난 뒤 다시 시도하세요. 지금 중지하면 그 작업을 처음부터 다시 할 수 있습니다.",
+    },
+    "appx_node_not_stopped": {
+        "de": "Der Node wurde nicht rechtzeitig beendet, daher wurde nichts geändert. Versuchen Sie es in ein paar Minuten erneut.",
+        "es": "El nodo no se detuvo a tiempo, así que no se cambió nada. Vuelve a intentarlo en unos minutos.",
+        "fr": "Le nœud ne s'est pas arrêté à temps, rien n'a donc été modifié. Réessayez dans quelques minutes.",
+        "pt": "O nó não parou a tempo, por isso nada foi alterado. Tente novamente em alguns minutos.",
+        "ru": "Узел не остановился вовремя, поэтому ничего не изменено. Повторите попытку через несколько минут.",
+        "zh": "节点未能及时停止，因此未做任何更改。请几分钟后重试。",
+        "ja": "ノードが時間内に停止しなかったため、何も変更されませんでした。数分後にもう一度お試しください。",
+        "ko": "노드가 제때 중지되지 않아 아무것도 변경되지 않았습니다. 몇 분 후 다시 시도하세요.",
+    },
     # --- Daemon shutdown hardening: stopping the node on quit (never kill unasked) ---
     "shutdown_leave_running": {
         "de": "Wallet schließen – Node weiterlaufen lassen", "es": "Cerrar la cartera y dejar el nodo en marcha",