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.h

@@ -29,6 +29,10 @@ struct AddressInfo {
     bool isSpendable() const { return has_spending_key; }
 };
 
+std::vector<size_t> sortedSpendableAddressIndices(const std::vector<AddressInfo>& addresses,
+                                                  bool requirePositiveBalance = true);
+int bestSpendableAddressIndex(const std::vector<AddressInfo>& addresses);
+
 /**
  * @brief Represents a wallet transaction
  */
@@ -137,6 +141,8 @@ struct MarketInfo {
     double market_cap = 0.0;
     std::string last_updated;
     std::chrono::steady_clock::time_point last_fetch_time{};
+    bool price_loading = false;
+    std::string price_error;
     
     // Price history for chart
     std::vector<double> price_history;