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/rpc/rpc_client.cpp

@@ -100,7 +100,20 @@ bool RPCClient::connect(const std::string& host, const std::string& port,
         }
     } catch (const std::exception& e) {
         last_connect_error_ = e.what();
-        DEBUG_LOGF("Connection failed: %s\n", e.what());
+        // Daemon warmup messages (Loading block index, Verifying blocks, etc.)
+        // are normal startup progress — don't label them "Connection failed".
+        std::string msg = e.what();
+        bool isWarmup = (msg.find("Loading") != std::string::npos ||
+                         msg.find("Verifying") != std::string::npos ||
+                         msg.find("Activating") != std::string::npos ||
+                         msg.find("Rewinding") != std::string::npos ||
+                         msg.find("Rescanning") != std::string::npos ||
+                         msg.find("Pruning") != std::string::npos);
+        if (isWarmup) {
+            DEBUG_LOGF("Daemon starting: %s\n", msg.c_str());
+        } else {
+            DEBUG_LOGF("Connection failed: %s\n", msg.c_str());
+        }
     }
 
     connected_ = false;