feat(portfolio): persisted portfolio entries + pure sum helpers

Foundation for the Market tab's configurable portfolio (custom labels tied to
groups of addresses):

- Settings gains a PortfolioEntry {label, addresses[]} list, persisted in
  settings.json as a JSON array-of-objects (same mechanism as lite_servers_),
  with get/setPortfolioEntries().
- data/portfolio.h (header-only, ImGui-free): SumPortfolioBalance() sums a
  group's DRGX balance against the live per-address list (unknown addresses
  contribute 0), plus PortfolioEntryContains/Add/Remove group helpers.
- Unit-tested (testPortfolioHelpers): empty/known/unknown-address sums, and the
  add/remove/contains membership semantics.

UI (editor dialog, Market card rework, Overview right-click) comes next.
Full-node + lite build clean; ctest green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/config/settings.cpp

@@ -294,6 +294,19 @@ bool Settings::load(const std::string& path)
             for (const auto& w : j["saved_pool_workers"])
                 if (w.is_string()) saved_pool_workers_.push_back(w.get<std::string>());
         }
+        if (j.contains("portfolio_entries") && j["portfolio_entries"].is_array()) {
+            portfolio_entries_.clear();
+            for (const auto& e : j["portfolio_entries"]) {
+                if (!e.is_object()) continue;
+                PortfolioEntry entry;
+                if (e.contains("label") && e["label"].is_string())
+                    entry.label = e["label"].get<std::string>();
+                if (e.contains("addresses") && e["addresses"].is_array())
+                    for (const auto& a : e["addresses"])
+                        if (a.is_string()) entry.addresses.push_back(a.get<std::string>());
+                if (!entry.label.empty()) portfolio_entries_.push_back(std::move(entry));
+            }
+        }
         if (j.contains("font_scale") && j["font_scale"].is_number())
             font_scale_ = std::max(1.0f, std::min(1.5f, j["font_scale"].get<float>()));
         if (j.contains("window_width") && j["window_width"].is_number_integer())
@@ -437,6 +450,14 @@ bool Settings::save(const std::string& path)
     j["saved_pool_workers"] = json::array();
     for (const auto& w : saved_pool_workers_)
         j["saved_pool_workers"].push_back(w);
+    j["portfolio_entries"] = json::array();
+    for (const auto& e : portfolio_entries_) {
+        json entry;
+        entry["label"] = e.label;
+        entry["addresses"] = json::array();
+        for (const auto& a : e.addresses) entry["addresses"].push_back(a);
+        j["portfolio_entries"].push_back(std::move(entry));
+    }
     j["font_scale"]     = font_scale_;
     j["settings_version"] = std::string(DRAGONX_VERSION);
     if (window_width_ > 0 && window_height_ > 0) {

src/config/settings.h

@@ -73,6 +73,13 @@ public:
         bool enabled = true;
     };
 
+    // A user-defined portfolio entry: a custom label tied to a group of wallet addresses.
+    // The Market tab's portfolio card sums these addresses' balances under the label.
+    struct PortfolioEntry {
+        std::string label;
+        std::vector<std::string> addresses;
+    };
+
     // Theme
     std::string getTheme() const { return theme_; }
     void setTheme(const std::string& theme) { theme_ = theme; }
@@ -251,6 +258,10 @@ public:
     const std::vector<LiteServerPreference>& getLiteServers() const { return lite_servers_; }
     void setLiteServers(const std::vector<LiteServerPreference>& servers) { lite_servers_ = servers; }
 
+    // User-defined portfolio entries (Market tab). "All funds" is implicit, not stored here.
+    const std::vector<PortfolioEntry>& getPortfolioEntries() const { return portfolio_entries_; }
+    void setPortfolioEntries(const std::vector<PortfolioEntry>& entries) { portfolio_entries_ = entries; }
+
     // Lite servers the user has hidden from the Network tab (kept by URL, shown via a toggle).
     const std::set<std::string>& getLiteHiddenServers() const { return lite_hidden_servers_; }
     bool isLiteServerHidden(const std::string& url) const { return lite_hidden_servers_.count(url) > 0; }
@@ -432,6 +443,8 @@ private:
     };
     std::set<std::string> lite_hidden_servers_;   // server URLs hidden from the Network tab
 
+    std::vector<PortfolioEntry> portfolio_entries_;   // Market tab custom portfolio groups
+
     bool verbose_logging_ = false;
     std::set<std::string> debug_categories_;
     bool theme_effects_enabled_ = true;

src/data/portfolio.h

@@ -0,0 +1,61 @@
+// DragonX Wallet - ImGui Edition
+// Copyright 2024-2026 The Hush Developers
+// Released under the GPLv3
+//
+// Portfolio helpers — pure balance math for the Market tab's configurable portfolio.
+// A portfolio entry is a user label tied to a group of wallet addresses (persisted in
+// Settings as PortfolioEntry); these helpers sum/query that group against the live
+// per-address balance list. No I/O, no ImGui — unit-testable.
+
+#pragma once
+
+#include "wallet_state.h"   // AddressInfo
+
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+namespace dragonx {
+namespace data {
+
+// Sum the DRGX balance of `entryAddresses` by looking them up in the wallet's per-address
+// list. Addresses not present in the wallet contribute 0 (e.g. removed/rescanned). Pure.
+inline double SumPortfolioBalance(const std::vector<std::string>& entryAddresses,
+                                  const std::vector<AddressInfo>& walletAddresses)
+{
+    if (entryAddresses.empty()) return 0.0;
+    std::unordered_set<std::string> want(entryAddresses.begin(), entryAddresses.end());
+    double sum = 0.0;
+    for (const auto& a : walletAddresses)
+        if (want.count(a.address)) sum += a.balance;
+    return sum;
+}
+
+// Whether `address` is part of the entry's address group.
+inline bool PortfolioEntryContains(const std::vector<std::string>& entryAddresses,
+                                   const std::string& address)
+{
+    for (const auto& a : entryAddresses)
+        if (a == address) return true;
+    return false;
+}
+
+// Add `address` to the group if absent (returns true if it was added).
+inline bool PortfolioEntryAdd(std::vector<std::string>& entryAddresses, const std::string& address)
+{
+    if (address.empty() || PortfolioEntryContains(entryAddresses, address)) return false;
+    entryAddresses.push_back(address);
+    return true;
+}
+
+// Remove `address` from the group if present (returns true if it was removed).
+inline bool PortfolioEntryRemove(std::vector<std::string>& entryAddresses, const std::string& address)
+{
+    for (auto it = entryAddresses.begin(); it != entryAddresses.end(); ++it) {
+        if (*it == address) { entryAddresses.erase(it); return true; }
+    }
+    return false;
+}
+
+} // namespace data
+} // namespace dragonx