feat(market): fix portfolio Add button clipping; add accordion summaries

- Add button can no longer be cut off: it's now a normal widget below the group
  list (in a group with the scroll child) instead of nested inside the list child.
- Stop the modal's 28x20 WindowPadding from cascading into the nested master/detail/
  list children (pop it right after the card child begins) — that double-padding
  was squeezing the master column and the Add button.
- Right pane navigability: collapsed accordion sections now show a compact summary
  on the right (Appearance -> icon, Price -> basis, Addresses -> N selected), so a
  group's state is readable without expanding. Section titles are consistent
  title-case ("Appearance"/"Price"/"Addresses").

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

src/util/i18n.cpp

@@ -1144,8 +1144,8 @@ void I18n::loadBuiltinEnglish()
         strings_["portfolio_spark_day"] = "Day";
         strings_["portfolio_spark_week"] = "Week";
         strings_["portfolio_spark_month"] = "Month";
-        strings_["portfolio_appearance"] = "APPEARANCE";
-        strings_["portfolio_addresses_hdr"] = "ADDRESSES";
+        strings_["portfolio_appearance"] = "Appearance";
+        strings_["portfolio_addresses_hdr"] = "Addresses";
         strings_["portfolio_search"] = "Search addresses\xE2\x80\xA6";
         strings_["portfolio_funded"] = "Funded";
         strings_["portfolio_select_all"] = "All";