feat: preview healed joins and save editor clips to library

tests/test_ui_structure.py

@@ -796,7 +796,8 @@ def test_audio_editor_dialog_scaffold(win):
     # widgets present
     assert dlg._wave is not None
     for name in ("_btn_heal_cut", "_btn_delete", "_btn_silence", "_btn_reverse",
-                 "_btn_trim", "_btn_undo", "_btn_redo", "_btn_save_as"):
+                 "_btn_trim", "_btn_undo", "_btn_redo", "_btn_loop_join",
+                 "_btn_save_library", "_btn_save_as"):
         assert isinstance(getattr(dlg, name), QPushButton)
     # undo disabled at the base version, redo disabled with no forward history
     assert not dlg._btn_undo.isEnabled()
@@ -907,6 +908,49 @@ def test_editor_play_stop_safe(win, tmp_path):
     assert dlg._btn_play.text() == "▶ Play"
 
 
+def test_editor_loop_join_plays_preview_range(win, tmp_path, monkeypatch):
+    import main as m
+    src = tmp_path / "v0.wav"
+    src.write_bytes(b"")
+    dlg = m.AudioEditorDialog(str(src), parent=win)
+    dlg._join_preview = (1.0, 3.0)
+    seen = {}
+    monkeypatch.setattr(
+        dlg, "_play_current",
+        lambda start=None, end=None: seen.update(start=start, end=end))
+    dlg._on_loop_join()
+    assert seen == {"start": 1.0, "end": 3.0}
+
+
+def test_editor_save_to_library_adds_current_version(win, tmp_path, monkeypatch):
+    import main as m
+    src = tmp_path / "v0.wav"
+    src.write_bytes(b"")
+    out_dir = tmp_path / "library"
+    win._settings.setValue("audio_library_dir", str(out_dir))
+    dlg = m.AudioEditorDialog(str(src), parent=win)
+    dlg._clip_dur = 2.0
+    saved = []
+    monkeypatch.setattr(
+        m, "build_audio_clip_command",
+        lambda inp, start, dur, out: ["ffmpeg", out])
+
+    def fake_run(cmd, capture_output=True, timeout=300):
+        target = cmd[-1]
+        os.makedirs(os.path.dirname(target), exist_ok=True)
+        with open(target, "wb") as f:
+            f.write(b"x")
+        class Proc:
+            returncode = 0
+        return Proc()
+
+    monkeypatch.setattr(m.subprocess, "run", fake_run)
+    win._scan_panel._library.add_clip = lambda p: saved.append(p)
+    dlg._on_save_to_library()
+    assert saved
+    assert saved[0].startswith(str(out_dir))
+
+
 def test_editor_close_cleans_temps(win, tmp_path):
     import main as m
     src = tmp_path / "v0.wav"; src.write_bytes(b"")