daemon version check, idle mining control, bootstrap mirror, import key paste, and cleanup

- Add startup binary version checking for dragonxd/xmrig
- Display daemon version in UI
- Add idle mining thread count adjustment
- Add bootstrap mirror option (bootstrap2.dragonx.is) in setup wizard
- Add paste button to import private key dialog with address validation
- Add z-address generation UI feedback (loading indicator)
- Add option to delete blockchain data while preserving wallet.dat
- Add font scale slider hotkey tooltip (Ctrl+Plus/Ctrl+Minus)
- Fix Windows RPC auth: trim \r from config values, add .cookie fallback
- Fix connection status message during block index loading
- Improve application shutdown to prevent lingering background process

src/util/bootstrap.cpp

@@ -3,6 +3,7 @@
 // Released under the GPLv3
 
 #include "bootstrap.h"
+#include "../daemon/embedded_daemon.h"
 
 #include <curl/curl.h>
 #include <miniz.h>
@@ -135,11 +136,33 @@ void Bootstrap::start(const std::string& dataDir, const std::string& url) {
             worker_running_ = false;
             return;
         }
-        // Step 3: Clean old chain data
+        // Step 3: Ensure daemon is fully stopped before touching chain data
+        {
+            setProgress(State::Extracting, "Waiting for daemon to stop...");
+            int waited = 0;
+            while (daemon::EmbeddedDaemon::isRpcPortInUse() && waited < 60 && !cancel_requested_) {
+                std::this_thread::sleep_for(std::chrono::seconds(1));
+                waited++;
+                if (waited % 5 == 0)
+                    DEBUG_LOGF("[Bootstrap] Still waiting for daemon to stop... (%ds)\n", waited);
+            }
+            if (cancel_requested_) {
+                setProgress(State::Failed, "Cancelled while waiting for daemon");
+                worker_running_ = false;
+                return;
+            }
+            if (daemon::EmbeddedDaemon::isRpcPortInUse()) {
+                setProgress(State::Failed, "Daemon is still running — stop it before using bootstrap");
+                worker_running_ = false;
+                return;
+            }
+        }
+
+        // Step 4: Clean old chain data
         setProgress(State::Extracting, "Removing old chain data...");
         cleanChainData(dataDir);
 
-        // Step 4: Extract (skipping wallet.dat)
+        // Step 5: Extract (skipping wallet.dat)
         if (!extract(zipPath, dataDir)) {
             if (cancel_requested_)
                 setProgress(State::Failed, "Extraction cancelled");