feat(console): redesign the RPC reference as a novice-friendly command explorer

Replace the flat, terse command-reference table with a guided two-pane
explorer built for users who don't know the RPC commands:

- Search by name OR task: keyword synonyms let "balance" find getbalance,
  "send money" find sendtoaddress; results are ranked (name-prefix > name >
  keyword > desc).
- Two panes (mirrors the portfolio editor): a category-grouped master list
  (mono names, a warning dot on consequential commands) + a rich detail pane
  with a plain-language explanation, a per-parameter type breakdown (string /
  number / json, optional dimmed), and a concrete example.
- Insert into console (fills the input with a template to review + run) and,
  for no-parameter commands, Insert & run — with a confirm for destructive
  ones. Deferred via pending_submit_ so the modal needs no executor.
- Keyboard: type to filter, Up/Down to move, Enter to insert; auto-focus and
  auto-select the top result.

Data model: ConsoleCommandEntry gains details/example/keywords/destructive
(C++17 defaults, so the ~60 un-enriched entries are untouched); ~20 common
commands enriched and 18 consequential ones flagged. Command docs stay English
(technical); the UI chrome + 7 category names are translated into all 8
languages (CJK subset rebuilt, +3 glyphs).

Verified: two-pane renders on dark + light skins and at font_scale 1.5; detail
pane shows explanation/params/example; danger dots + safety badge on
destructive commands.

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

src/util/i18n.cpp

@@ -1301,6 +1301,19 @@ void I18n::loadBuiltinEnglish()
         strings_["console_cat_wallet"] = "Wallet";
         strings_["console_cat_raw_transactions"] = "Raw Transactions";
         strings_["console_cat_utility"] = "Utility";
+        strings_["console_ref_search_hint"] = "Search by name or task\xE2\x80\xA6";
+        strings_["console_ref_parameters"] = "Parameters";
+        strings_["console_ref_no_params"] = "Takes no parameters.";
+        strings_["console_ref_optional"] = "optional";
+        strings_["console_ref_example"] = "Example";
+        strings_["console_ref_destructive"] = "Consequential";
+        strings_["console_ref_run_confirm"] = "Run %s now? This is a consequential command.";
+        strings_["console_ref_cancel"] = "Cancel";
+        strings_["console_ref_run"] = "Run";
+        strings_["console_ref_insert"] = "Insert into console";
+        strings_["console_ref_insert_run"] = "Insert & run";
+        strings_["console_ref_select_hint"] = "Select a command to see what it does.";
+        strings_["console_ref_no_match"] = "No commands match.";
 
         // --- Export All Keys Dialog ---
         strings_["export_keys_btn"] = "Export Keys";