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>

res/lang/ja.json

@@ -229,6 +229,19 @@
     "console_no_daemon": "デーモンなし",
     "console_not_connected": "エラー：デーモンに接続されていません",
     "console_quit_note": "ここでは 'quit'／'exit' は不要です — ウィンドウを閉じるだけで構いません。",
+    "console_ref_cancel": "キャンセル",
+    "console_ref_destructive": "要注意",
+    "console_ref_example": "例",
+    "console_ref_insert": "コンソールに挿入",
+    "console_ref_insert_run": "挿入して実行",
+    "console_ref_no_match": "一致するコマンドはありません。",
+    "console_ref_no_params": "パラメーターは不要です。",
+    "console_ref_optional": "任意",
+    "console_ref_parameters": "パラメーター",
+    "console_ref_run": "実行",
+    "console_ref_run_confirm": "%s を今すぐ実行しますか？ 影響の大きいコマンドです。",
+    "console_ref_search_hint": "名前または用途で検索…",
+    "console_ref_select_hint": "コマンドを選ぶと内容が表示されます。",
     "console_rpc_reference": "RPCコマンドリファレンス",
     "console_rpc_trace": "RPC",
     "console_scanline": "コンソールスキャンライン",