fix(studio): Qt6 compat + Ctrl+C signal handler

- flash_console: setTextFormat(Qt.TextFormat.RichText) — int overload removed in Qt6
- installer_widget: same fix + add Qt to QtCore import
- project_editor/installer_widget: Session.has() → Session.can()
- app.py: signal.signal(SIGINT, SIG_DFL) so Ctrl+C kills the process from terminal

AR_electronics — AR-Autopilot Project

arautopilot/studio/flash_console.py

@@ -31,7 +31,7 @@ import sys
 from pathlib import Path
 from typing import Optional
 
-from PySide6.QtCore import QObject, QThread, Signal
+from PySide6.QtCore import QObject, Qt, QThread, Signal
 from PySide6.QtWidgets import (
     QComboBox,
     QDialog,
@@ -148,7 +148,7 @@ class FlashConsoleWidget(QWidget):
             f"Logged in as <b>{self._session.user.display_name}</b> "
             f"({self._session.role.value})."
         )
-        header.setTextFormat(0x1)  # PlainText would lose <br/>; RichText = 1
+        header.setTextFormat(Qt.TextFormat.RichText)
         header.setWordWrap(True)
         outer.addWidget(header)