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>

src/util/i18n.cpp

@@ -1039,7 +1039,13 @@ void I18n::loadBuiltinEnglish()
         strings_["confirm_transaction"] = "Confirm Transaction";
         strings_["confirm_and_send"] = "Confirm & Send";
         strings_["cancel"] = "Cancel";
-        
+
+        // Wallet-switch "stop the running node?" confirmation
+        strings_["switch_stopnode_title"] = "Stop the running node?";
+        strings_["switch_stopnode_warn"] = "A node is already running that this wallet didn't start.";
+        strings_["switch_stopnode_body"] = "Switching wallets restarts the node on the wallet you selected. The running node will be stopped and relaunched on the new wallet — if you kept it running on purpose, it comes back up automatically.";
+        strings_["switch_stopnode_confirm"] = "Stop node & switch";
+
         // Receive Tab
         strings_["receiving_addresses"] = "Your Receiving Addresses";
         strings_["new_z_shielded"] = "New z-Address (Shielded)";