feat: audio format + fade/normalize/gain widgets; free them from the transport row

main.py

@@ -4460,8 +4460,41 @@ class MainWindow(QMainWindow):
             "Extract this exact length of audio from the playhead and save it")
         self._btn_extract_audio.setEnabled(False)
         self._btn_extract_audio.clicked.connect(self._on_extract_audio)
-        transport_row.addWidget(self._spn_audio_len)
-        transport_row.addWidget(self._btn_extract_audio)
+
+        # Output format (persisted) — drives the extract extension + save filter.
+        self._cmb_audio_fmt = QComboBox()
+        for label, ext in (("WAV", ".wav"), ("MP3", ".mp3"), ("FLAC", ".flac"),
+                           ("M4A", ".m4a"), ("OGG", ".ogg"), ("OPUS", ".opus")):
+            self._cmb_audio_fmt.addItem(label, ext)
+        saved_fmt = self._settings.value("audio_extract_fmt", ".wav")
+        idx = self._cmb_audio_fmt.findData(saved_fmt)
+        self._cmb_audio_fmt.setCurrentIndex(idx if idx >= 0 else 0)
+        self._cmb_audio_fmt.currentIndexChanged.connect(
+            lambda _i: self._settings.setValue(
+                "audio_extract_fmt", self._cmb_audio_fmt.currentData()))
+
+        # Non-destructive edit controls (applied via ffmpeg -af at extract time).
+        # Edit params are per-extract (intentionally not persisted); only the format is sticky.
+        self._spn_fade_in = QDoubleSpinBox()
+        self._spn_fade_in.setRange(0.0, 30.0)
+        self._spn_fade_in.setDecimals(2)
+        self._spn_fade_in.setSingleStep(0.1)
+        self._spn_fade_in.setSuffix(" s")
+        self._spn_fade_in.setToolTip("Fade-in duration (0 = none)")
+        self._spn_fade_out = QDoubleSpinBox()
+        self._spn_fade_out.setRange(0.0, 30.0)
+        self._spn_fade_out.setDecimals(2)
+        self._spn_fade_out.setSingleStep(0.1)
+        self._spn_fade_out.setSuffix(" s")
+        self._spn_fade_out.setToolTip("Fade-out duration (0 = none)")
+        self._chk_normalize = QCheckBox("Normalize")
+        self._chk_normalize.setToolTip("Apply EBU R128 loudness normalization (loudnorm)")
+        self._spn_gain = QDoubleSpinBox()
+        self._spn_gain.setRange(-30.0, 30.0)
+        self._spn_gain.setDecimals(1)
+        self._spn_gain.setSingleStep(0.5)
+        self._spn_gain.setSuffix(" dB")
+        self._spn_gain.setToolTip("Gain applied to the extracted audio (0 = unchanged)")
         self._transport_row = transport_row
 
         # Row 1b — subcategory (subprofile) export buttons live on their own

tests/test_ui_structure.py

@@ -282,3 +282,16 @@ def test_audio_deck_tab_exists(win):
     labels = [win._control_deck.tabText(i)
               for i in range(win._control_deck.count())]
     assert "Audio" in labels and "Scan" not in labels
+
+
+def test_audio_edit_widgets_exist(win):
+    from PyQt6.QtWidgets import QComboBox, QCheckBox, QDoubleSpinBox
+    assert isinstance(win._cmb_audio_fmt, QComboBox)
+    assert win._cmb_audio_fmt.count() >= 3            # wav/mp3/flac at least
+    assert isinstance(win._spn_fade_in, QDoubleSpinBox)
+    assert isinstance(win._spn_fade_out, QDoubleSpinBox)
+    assert isinstance(win._chk_normalize, QCheckBox)
+    assert isinstance(win._spn_gain, QDoubleSpinBox)
+    assert win._cmb_audio_fmt.findData(".wav") >= 0
+    assert win._cmb_audio_fmt.findData(".mp3") >= 0
+    assert win._cmb_audio_fmt.findData(".flac") >= 0