feat(console): add an "App" toggle to show/hide [app] log lines

The console mixed RPC traces, daemon output, and the wallet's own "[app] ..."
log lines with no way to hide the latter. Add an "App" checkbox alongside the
existing Daemon/Errors/RPC toggles. Since [app] lines share COLOR_INFO with
other info text, the filter matches them by their "[app] " prefix rather than by
color. Default on; unit test + i18n added.

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

src/ui/windows/console_output_model.h

@@ -12,6 +12,7 @@ struct ConsoleOutputFilter {
     bool daemonMessagesEnabled = true;
     bool errorsOnly = false;
     bool rpcTraceEnabled = false;
+    bool appMessagesEnabled = true;   // "[app] ..." wallet log lines (matched by prefix, not color)
     ImU32 daemonColor = 0;
     ImU32 errorColor = 0;
     ImU32 rpcTraceColor = 0;