Refactor app services and stabilize refresh/UI flows

- Add refresh scheduler and network refresh service boundaries for typed
  refresh results, ordered RPC collectors, applicators, and price parsing.
- Add daemon lifecycle and wallet security workflow helpers while preserving
  App-owned command RPC, decrypt, cancellation, and UI handoff behavior.
- Split balance, console, mining, amount formatting, and async task logic into
  focused modules with expanded Phase 4 test coverage.
- Fix market price loading by triggering price refresh immediately, avoiding
  queue-pressure drops, tracking loading/error state, and adding translations.
- Polish send, explorer, peers, settings, theme/schema, and related tab UI.
- Replace checked-in generated language headers with build-generated resources.
- Document the cleanup audit, UI static-state guidance, and architecture updates.

src/data/wallet_state.cpp

@@ -3,12 +3,44 @@
 // Released under the GPLv3
 
 #include "wallet_state.h"
+#include <algorithm>
 #include <ctime>
 #include <sstream>
 #include <iomanip>
 
 namespace dragonx {
 
+std::vector<size_t> sortedSpendableAddressIndices(const std::vector<AddressInfo>& addresses,
+                                                  bool requirePositiveBalance)
+{
+    std::vector<size_t> indices;
+    indices.reserve(addresses.size());
+    for (size_t i = 0; i < addresses.size(); ++i) {
+        const auto& address = addresses[i];
+        if (!address.isSpendable()) continue;
+        if (requirePositiveBalance && address.balance <= 0.0) continue;
+        indices.push_back(i);
+    }
+
+    std::sort(indices.begin(), indices.end(), [&](size_t lhs, size_t rhs) {
+        return addresses[lhs].balance > addresses[rhs].balance;
+    });
+    return indices;
+}
+
+int bestSpendableAddressIndex(const std::vector<AddressInfo>& addresses)
+{
+    int bestIndex = -1;
+    double bestBalance = 0.0;
+    for (size_t i = 0; i < addresses.size(); ++i) {
+        if (addresses[i].isSpendable() && addresses[i].balance > bestBalance) {
+            bestBalance = addresses[i].balance;
+            bestIndex = static_cast<int>(i);
+        }
+    }
+    return bestIndex;
+}
+
 std::string TransactionInfo::getTimeString() const
 {
     if (timestamp == 0) return "Unknown";