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/ui/schema/skin_manager.cpp

@@ -43,6 +43,11 @@ std::string SkinManager::getBundledSkinsDirectory() {
     fs::path themes_dir = exe_dir / "res" / "themes";
 
     if (fs::exists(themes_dir)) {
+        // Update any stale overlay themes from embedded versions
+        int updated = resources::updateBundledThemes(themes_dir.string());
+        if (updated > 0)
+            DEBUG_LOGF("[SkinManager] Updated %d stale theme(s) in %s\n",
+                   updated, themes_dir.string().c_str());
         return themes_dir.string();
     }