Live mode: an AI assistant acts on the open project while the user watches

A new setting, Configurer QElectroTech > Général > "Autoriser un assistant
IA à agir sur le projet ouvert", off by default. Off, nothing changes:
no channel is opened. On, every start shows a warning first -- Continuer,
Pas pour cette session, or Désactiver -- and nothing can connect until
the user answers Continuer. It waits for any other start-up question to
be answered, so the two never stack.

Accepted, LiveServer opens a local socket only the user's account can
use, with a random name and token written to live-session.json in the
data folder for the qet MCP server, and removed when the channel closes.
One JSON request per line: status (project, folio on screen, selection,
last undo step, stored scripts), run_script and run_stored. Requests are
queued out of the socket handler before they run (the lesson of PR #861).

Each run is one undo step named "Assistant : <name>". The status bar
shows the mode and the assistant's last action with a ✓ or ✗ and the
time, and an Arrêter button that closes the channel for the session.
Unticking the setting closes it at once.

QetScripting::runSource() runs script text and, for a live run, returns
what qet.log() wrote, the error with its line and the undo step instead
of showing boxes; qet.showMessage() is logged rather than opening a box
nobody asked for.

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

sources/ui/configpage/generalconfigurationpage.cpp

@@ -16,6 +16,7 @@
 	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include "generalconfigurationpage.h"
+#include "../../scripting/liveserver.h"
 
 #include "../../qetapp.h"
 #include "../../qeticons.h"
@@ -131,6 +132,11 @@ GeneralConfigurationPage::GeneralConfigurationPage(QWidget *parent) :
 		//quietly clear a preference set on a build that does have Qml.
 	ui->m_enable_scripting->setVisible(false);
 	ui->m_enable_scripting->setEnabled(false);
+#endif
+	ui->m_live_assistant->setChecked(QetSettings::liveAssistantEnabled());
+#ifndef QET_HAS_SCRIPTING
+	ui->m_live_assistant->setVisible(false);
+	ui->m_live_assistant->setEnabled(false);
 #endif
 	ui->m_use_folio_label->setChecked(settings.value("genericpanel/folio", true).toBool());
 	ui->m_border_0->setChecked(settings.value("border-columns_0", false).toBool());
@@ -306,6 +312,13 @@ void GeneralConfigurationPage::applyConf()
 		//real preference the first time this dialog is accepted.
 	if (ui->m_enable_scripting->isEnabled()) {
 		QetSettings::setScriptingEnabled(ui->m_enable_scripting->isChecked());
+	}
+	if (ui->m_live_assistant->isEnabled()) {
+		QetSettings::setLiveAssistantEnabled(ui->m_live_assistant->isChecked());
+#ifdef QET_HAS_SCRIPTING
+			//Switching it off closes the door now, not at the next start
+		if (!ui->m_live_assistant->isChecked()) LiveServer::instance().stop();
+#endif
 	}
 
 		//GENERIC PANEL

sources/ui/configpage/generalconfigurationpage.ui

@@ -275,6 +275,16 @@
         </widget>
        </item>
        <item row="5" column="0">
+        <widget class="QCheckBox" name="m_live_assistant">
+         <property name="text">
+          <string>Autoriser un assistant IA à agir sur le projet ouvert (mode direct)</string>
+         </property>
+         <property name="toolTip">
+          <string>Un assistant connecté par le serveur MCP peut alors exécuter des scripts sur le projet ouvert, sous vos yeux. Un avertissement est affiché à chaque démarrage tant que ce réglage est activé. Prend effet au prochain démarrage ; le décocher coupe la connexion tout de suite.</string>
+         </property>
+        </widget>
+       </item>
+       <item row="6" column="0">
         <spacer name="verticalSpacer_2">
          <property name="orientation">
           <enum>Qt::Vertical</enum>