Assistant house style: rewrite qet-assistant.json when the style changes

qet.setHouseStyle() only saved the setting, so an assistant reading
qet-assistant.json saw the old text until QElectroTech restarted.
AssistantInfo::refresh() writes the file again, but only in a
QElectroTech that writes it at all: a headless --run would otherwise
replace the open QElectroTech's live channel with its own empty one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sources/scripting/assistantinfo.cpp

@@ -36,6 +36,7 @@
 namespace {
 	QJsonObject s_live;	///< empty while live mode is closed
 	bool s_running = true;
+	bool s_watching = false;	///< this QElectroTech writes the file (an editor opened)
 }
 
 namespace AssistantInfo {
@@ -54,14 +55,25 @@ QString path()
 */
 void watch()
 {
-	static bool watching = false;
-	if (watching) return;
-	watching = true;
+	if (s_watching) return;
+	s_watching = true;
 	QObject::connect(&ScriptLibrary::instance(), &ScriptLibrary::changed, &write);
 	QObject::connect(qApp, &QCoreApplication::aboutToQuit, &markStopped);
 	write();
 }
 
+/**
+	@brief refresh
+	Write the file again after a setting it carries changed, but only in a
+	QElectroTech that writes it at all: a headless --run never opened an
+	editor, and writing from it would replace the open QElectroTech's live
+	channel with its own empty one.
+*/
+void refresh()
+{
+	if (s_watching) write();
+}
+
 void write()
 {
 	QJsonArray scripts, refused;