feat: emit SessionRenamed signal on successful rename

main.go

@@ -256,6 +256,7 @@ func (m *SessionManager) RenameSession(sessionID, newName string) (bool, *dbus.E
 		m.mu.Unlock()
 		return false, nil
 	}
+	m.conn.Emit(busPath, busIface+".SessionRenamed", sessionID, newName)
 	return true, nil
 }
 
@@ -634,6 +635,10 @@ const introspectXML = `<node>
     <signal name="SessionKilled">
       <arg name="session_id" type="s"/>
     </signal>
+    <signal name="SessionRenamed">
+      <arg name="old_id" type="s"/>
+      <arg name="new_id" type="s"/>
+    </signal>
     <signal name="StateChanged">
       <arg name="session_id" type="s"/>
       <arg name="new_state" type="s"/>