fix: editor cleanup on Escape/reject + stop main audition on open

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

main.py

@@ -4297,7 +4297,7 @@ class AudioEditorDialog(QDialog):
             proc.deleteLater()
         self._btn_play.setText("▶ Play")
 
-    def closeEvent(self, ev) -> None:
+    def _cleanup(self) -> None:
         self._stop_play()
         for _t in list(self._temps):
             try:
@@ -4305,8 +4305,15 @@ class AudioEditorDialog(QDialog):
             except OSError:
                 pass
         self._temps.clear()
+
+    def closeEvent(self, ev) -> None:
+        self._cleanup()
         super().closeEvent(ev)
 
+    def reject(self) -> None:
+        self._cleanup()
+        super().reject()
+
     def _on_save_as(self):
         path, _sel = QFileDialog.getSaveFileName(
             self, "Save edited audio", "",
@@ -7076,6 +7083,7 @@ class MainWindow(QMainWindow):
         if not self._file_path:
             self._show_status("Load a video first", 3000)
             return
+        self._stop_audition()
         import tempfile
         start = self._cursor
         dur = self._spn_audio_len.value()
@@ -7101,6 +7109,7 @@ class MainWindow(QMainWindow):
         self._merge_temps.add(tmp)          # reuse the close-time temp sweep
         dlg = AudioEditorDialog(tmp, parent=self)
         dlg.exec()
+        dlg.deleteLater()
 
     def _merge_move(self, delta: int) -> None:
         row = self._merge_list.currentRow()