refactor(console): unify lite + full-node console behind a pluggable executor

The two consoles were separate implementations (the rich full-node ConsoleTab and a
minimal RenderLiteConsoleTab). Introduce ConsoleCommandExecutor to abstract the only
real differences — command execution + log source — so both variants share the one rich
terminal (the lite console now gains selection, zoom, copy, and JSON-colored output).

- console_command_executor.{h,cpp}: interface + FullNodeConsoleExecutor (dragonxd log
  ingestion + RPC command execution, result queue) and LiteConsoleExecutor (lite
  diagnostics ring + backend runConsoleCommand/takeConsoleResult, connection/sync status).
- ConsoleTab::render() now takes a ConsoleCommandExecutor&; log ingestion, command
  submission, and command results flow through it. The RPC command-reference popup and
  the daemon/errors/rpc-trace/app filter toggles are gated on the executor's capabilities;
  the toolbar status dot + a status header come from the executor.
- Safety preserved: `clear`/`cls` is intercepted as a view-only clear in the shared UI so
  it is NEVER forwarded (the lite backend's `clear` wipes tx history); command output is
  not persisted to diagnostics.
- App owns the executor (created per variant) and routes both NavPages to console_tab_;
  lite_console_tab.{h,cpp} deleted.

Needs runtime verification of BOTH consoles (full-node RPC + lite: clear, seed/export
secrecy, sync status, command results).

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

src/app.h

@@ -155,6 +155,12 @@ public:
     // Accessors for subsystems
     rpc::RPCClient* rpc() { return rpc_.get(); }
     rpc::RPCWorker* worker() { return worker_.get(); }
+    // Console backend accessors (fast-lane-preferring, defined in app.cpp where the
+    // subsystem types are complete) used by the shared console executor.
+    rpc::RPCClient* consoleRpc();
+    rpc::RPCWorker* consoleWorker();
+    daemon::EmbeddedDaemon* consoleDaemon();
+    daemon::XmrigManager* consoleXmrig();
     config::Settings* settings() { return settings_.get(); }
     // Lite wallet controller (non-null only in lite builds with a linked backend).
     wallet::LiteWalletController* liteWallet() { return lite_wallet_.get(); }
@@ -607,8 +613,9 @@ private:
     int coin_logo_h_ = 0;
     bool coin_logo_loaded_ = false;
 
-    // Console tab
+    // Console tab + its backend executor (full-node RPC or lite backend), created lazily.
     ui::ConsoleTab console_tab_;
+    std::unique_ptr<ui::ConsoleCommandExecutor> console_exec_;
     
     // Pending payment from URI
     bool pending_payment_valid_ = false;