feat(wallet): confirm before stopping an adopted node to switch wallets

When switching wallets, the node the app would restart may be one this session
ADOPTED — a dragonxd already running at launch (left up by "keep node running",
or started by the user). Rather than stopping it silently (or the old dead-code
"stop any external dragonxd first" refusal), show a "Stop the running node?"
confirmation first; switching then stops it (RPC stop + wait for the port to
fully free) and relaunches on the selected wallet.

- switchToWallet(walletFile, stopDaemonConfirmed=false): when the node is adopted
  (externalDaemonDetected) and not yet confirmed, defer to the dialog and return.
- renderSwitchStopDaemonDialog(): BlurFloat overlay (house style) with a warning
  header; confirm re-enters switchToWallet(w, true); cancel/X aborts, node keeps
  running. Owned nodes (started this session) still restart silently.
- i18n (EN + 8 languages, additive) + CJK subset rebuild; modal-switch-stopnode
  sweep surface for visual review.

Gate/re-entrancy adversarially verified (no state leak; owned switches ungated;
prompt reappears on a reverted switch; dead-daemon-before-confirm handled).

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

res/lang/de.json

@@ -1294,6 +1294,10 @@
     "sweep_to": "Gefegt an:",
     "sweep_toggle": "In meine Wallet fegen (Schlüssel nicht behalten)",
     "sweep_tx": "Transaktion:",
+    "switch_stopnode_body": "Beim Wallet-Wechsel wird der Knoten mit der ausgewählten Wallet neu gestartet. Der laufende Knoten wird gestoppt und mit der neuen Wallet neu gestartet – wenn Sie ihn absichtlich laufen ließen, startet er automatisch wieder.",
+    "switch_stopnode_confirm": "Knoten stoppen & wechseln",
+    "switch_stopnode_title": "Laufenden Knoten stoppen?",
+    "switch_stopnode_warn": "Es läuft bereits ein Knoten, den diese Wallet nicht gestartet hat.",
     "syncing": "Synchronisiere...",
     "t_address": "T-Adresse",
     "t_addresses": "T-Adressen",