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;

sources/scripting/assistantinfo.h

@@ -43,6 +43,7 @@ namespace AssistantInfo
 	QString path();
 	void watch();
 	void write();
+	void refresh();
 	void setLive(const QJsonObject &live);
 	void markStopped();
 }

sources/scripting/qetscriptapi.cpp

@@ -45,6 +45,7 @@
 #include "../conductorrouter.h"
 #include "../qetgraphicsitem/diagramimageitem.h"
 #include "../utils/qetsettings.h"
+#include "assistantinfo.h"
 
 // See diagrameventaddpdf.h: a missing QtPdf module (or Qt < 6.4) is not
 // fatal at build time, so addPdfPage() is always declared -- a script
@@ -4224,6 +4225,9 @@ QString QetScriptApi::houseStyle() const
 bool QetScriptApi::setHouseStyle(const QString &text)
 {
 	QetSettings::setHouseStyle(text);
+		//qet-assistant.json carries it: an assistant reading the file
+		//now must see the new text, not the one from the last start
+	AssistantInfo::refresh();
 	return true;
 }