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

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

tests/test_ui_structure.py

@@ -749,3 +749,14 @@ def test_editor_close_cleans_temps(win, tmp_path):
     dlg.close()
     assert not t1.exists()
     assert os.path.exists(str(src))       # _versions[0] (entry temp) is NOT swept by the editor
+
+
+def test_editor_reject_cleans_temps(win, tmp_path):
+    import main as m
+    src = tmp_path / "v0.wav"; src.write_bytes(b"")
+    t1 = tmp_path / "t1.wav"; t1.write_bytes(b"x")
+    dlg = m.AudioEditorDialog(str(src), parent=win)
+    dlg._temps.add(str(t1))
+    dlg.reject()                        # Escape path
+    assert not t1.exists()              # op temp swept
+    assert os.path.exists(str(src))     # entry temp (_versions[0]) survives