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/ui/windows/console_tab.h

@@ -25,6 +25,7 @@ namespace ui {
 
 class ConsoleCommandExecutor;
 struct ConsoleLogFilterCaps;
+struct ConsoleCommandEntry;
 
 /**
  * @brief Console tab — a rich terminal shared by the full-node and lite variants.
@@ -115,6 +116,8 @@ private:
     void addFormattedResult(const std::string& result, bool is_error);
     void renderStatusHeader(ConsoleCommandExecutor& exec);
     void renderCommandsPopup();
+    void renderCommandDetail(const ConsoleCommandEntry& cmd, const char* catLabel);  // right pane
+    void insertCommandToInput(const ConsoleCommandEntry& cmd);  // fill input + close the modal
 
     // renderToolbar() draws the top bar; these are its sub-steps:
     void renderToolbar(ConsoleCommandExecutor& exec);
@@ -183,9 +186,13 @@ private:
     // consumed by the renderer + hit-testing.
     mutable ConsoleLayout layout_;
 
-    // Commands popup
+    // Commands popup (RPC command explorer)
     bool show_commands_popup_ = false;
     char command_search_[128] = {0};   // RPC-reference search filter (cleared when the modal opens)
+    int  cmd_sel_cat_ = -1;            // detail-pane selection: category index into consoleCommandCategories()
+    int  cmd_sel_idx_ = -1;            // detail-pane selection: command index within that category
+    std::string pending_submit_;      // command to run next frame (deferred so the modal needs no executor)
+    const ConsoleCommandEntry* run_confirm_cmd_ = nullptr;  // destructive "Insert & run" awaiting confirmation
 };
 
 } // namespace ui