feat(portfolio): Market card entries + "Manage" editor dialog

Build the configurable-portfolio UI on the persisted model:
- The portfolio card keeps the "all funds" summary and now renders each custom
  entry below it as a compact row (label · summed DRGX · USD), live-computed via
  SumPortfolioBalance over the wallet's per-address balances; the card grows to
  fit the entries.
- A right-aligned "Manage…" button on the card header opens a modal editor
  (material overlay dialog): list entries with Edit/Delete, "Add entry", and an
  edit form = label field + quick "All shielded / All transparent / Clear"
  selectors + a checklist of wallet addresses (with balances). Persists to
  Settings on each mutation.
- i18n English defaults for the new portfolio_* strings.
- Test namespace fix (AddressInfo is dragonx::, not dragonx::data::).

Full-node + lite build clean; ctest green; source hygiene clean. Remaining:
the Overview-tab right-click "add/remove address to a label" integration.

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

src/util/i18n.cpp

@@ -1063,6 +1063,23 @@ void I18n::loadBuiltinEnglish()
         strings_["market_now"] = "Now";
         strings_["market_pct_shielded"] = "%.0f%% Shielded";
         strings_["market_portfolio"] = "MY DRGX";
+        strings_["portfolio_all_funds"] = "All funds";
+        strings_["portfolio_manage"] = "Manage\xE2\x80\xA6";
+        strings_["portfolio_manage_title"] = "Manage portfolio";
+        strings_["portfolio_add_entry"] = "Add entry";
+        strings_["portfolio_new_entry"] = "New entry";
+        strings_["portfolio_label"] = "Label";
+        strings_["portfolio_addresses_sel"] = "%d selected";
+        strings_["portfolio_all_shielded"] = "All shielded";
+        strings_["portfolio_all_transparent"] = "All transparent";
+        strings_["portfolio_clear_sel"] = "Clear";
+        strings_["portfolio_no_entries"] = "No custom entries yet. Add one to track a group of addresses.";
+        strings_["portfolio_edit"] = "Edit";
+        strings_["portfolio_delete"] = "Delete";
+        strings_["portfolio_save"] = "Save";
+        strings_["portfolio_cancel"] = "Cancel";
+        strings_["portfolio_add_to"] = "Add to portfolio";
+        strings_["portfolio_remove_from"] = "Remove from portfolio";
         strings_["market_24h_change"] = "24h";
         strings_["market_price_loading"] = "Loading price data...";
         strings_["market_price_unavailable"] = "Price data unavailable";