feat(console): lite backend command-reference modal

Give the lite console the parity analog of the full-node RPC command
reference: the same searchable two-pane modal (browse/search, detail
pane, examples, Insert / Insert & run, destructive confirm), driven by
the lite backend's own command set instead of daemon RPC.

- ConsoleCommandExecutor::commandReference() returns the category table
  (full node = consoleCommandCategories(); lite = new
  liteConsoleCommandCategories() -- 25 backend verbs in 5 categories).
  The shared renderCommandsPopup reads the table from the executor.
- The Commands button now shows for both variants (gated on
  commandReference()!=nullptr); title/tooltip/arg-quoting branch on
  hasRpcReference() (clarified to mean "speaks JSON-RPC / full node").
- Lite args are bare tokens (the backend takes one unsplit arg string
  and does not strip quotes), so the param-builder's JSON string
  auto-quoting is disabled for lite -- Insert & run emits runnable bare
  commands. send uses the JSON-array form (its positional form is
  unreachable via the single-arg transport); new uses zs/R; import
  takes just the key (the backend hardcodes birthday=0).

Adds 7 i18n keys across all 8 languages (additive). Full-node behavior
is unchanged. Adversarially reviewed (data vs the backend registry,
plumbing/regression, i18n) with all findings fixed.

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

src/util/i18n.cpp

@@ -1440,6 +1440,7 @@ void I18n::loadBuiltinEnglish()
         strings_["console_no_daemon"] = "No daemon";
         strings_["console_not_connected"] = "Error: Not connected to daemon";
         strings_["console_rpc_reference"] = "RPC Command Reference";
+        strings_["console_backend_reference"] = "Backend Command Reference";
         strings_["console_rpc_trace"] = "RPC";
         strings_["console_app"] = "App";
         strings_["console_show_app_output"] = "Show [app] wallet log lines";
@@ -1448,6 +1449,7 @@ void I18n::loadBuiltinEnglish()
         strings_["console_show_daemon_output"] = "Show daemon output";
         strings_["console_show_errors_only"] = "Show errors only";
         strings_["console_show_rpc_ref"] = "Show RPC command reference";
+        strings_["console_show_backend_ref"] = "Show backend command reference";
         strings_["console_show_rpc_trace"] = "Show app RPC calls";
         strings_["console_showing_lines"] = "Showing %zu of %zu lines";
         strings_["console_starting_node"] = "Starting node...";
@@ -1473,10 +1475,15 @@ void I18n::loadBuiltinEnglish()
         strings_["console_cat_wallet"] = "Wallet";
         strings_["console_cat_raw_transactions"] = "Raw Transactions";
         strings_["console_cat_utility"] = "Utility";
+        strings_["console_cat_sync"] = "Sync";
+        strings_["console_cat_send"] = "Send";
+        strings_["console_cat_keys"] = "Keys & Security";
+        strings_["console_cat_advanced"] = "Advanced";
         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_value"] = "value";
         strings_["console_ref_example"] = "Example";
         strings_["console_ref_builds"] = "Builds";
         strings_["console_ref_destructive"] = "Consequential";