feat(i18n,errors): route node-action toasts through i18n + friendlyRpcError

Finish the error-surfacing foundation across app_network.cpp (+ one in
app_wizard.cpp): ~21 toasts that were hardcoded English — or raw daemon/RPC
error text concatenated after an English prefix — now go through TR() keys, and
every raw-error one maps the detail through util::friendlyRpcError() (warming
up / locked / method-not-found / insufficient / unreachable → plain guidance,
raw text as fallback). Covers mining start/stop, pool start, peer ban/unban/
clear, key export, rescan, wallet-switch guards, and the lite-unavailable
notices.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app_wizard.cpp

@@ -73,7 +73,7 @@ WizardUiState s_wizardUi;
 void App::restartWizard()
 {
     if (!supportsFullNodeLifecycleActions()) {
-        ui::Notifications::instance().warning("Lite wallet lifecycle requests are available from Settings as dry-run readiness checks");
+        ui::Notifications::instance().warning(TR("toast_wizard_lite_unavailable"));
         return;
     }