Feat: Add 'Save As...' option to File menu

src/teletext/ui.py

@@ -222,11 +222,15 @@ class MainWindow(QMainWindow):
                 QMessageBox.critical(self, "Error", f"Failed to load file: {e}")
                 self.status_label.setText("Error loading file")
 
+    def save_as_file(self):
+        fname, _ = QFileDialog.getSaveFileName(self, "Save T42 As...", "", "Teletext Files (*.t42)")
+        if not fname: return
+        
+        self.current_file_path = fname
+        self.save_file()
+
     def save_file(self):
         if not self.current_file_path:
-             # Logic for "Save As" if path not known, but for T42 we usually overwrite or ask. 
-             # To keep it simple, ask every time or track path. 
-             # Let's ask.
              fname, _ = QFileDialog.getSaveFileName(self, "Save T42", "", "Teletext Files (*.t42)")
              if not fname: return
              self.current_file_path = fname