feat: editor playback + temp cleanup on close + docs (v1.6)

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

main.py

@@ -4112,6 +4112,7 @@ class AudioEditorDialog(QDialog):
         self._versions: list[str] = [path]
         self._ver_idx = 0
         self._temps: set[str] = set()      # rendered version temps to clean up
+        self._play_proc = None             # ffplay audition process
         self._clip_dur = 0.0               # true duration of the current version
 
         self._wave = AudioWaveform()
@@ -4250,7 +4251,61 @@ class AudioEditorDialog(QDialog):
             self._ver_idx += 1
             self._reload()
 
-    def _on_play(self):    pass
+    def _on_play(self, checked: bool) -> None:
+        if not checked:
+            self._stop_play()
+            return
+        from PyQt6.QtCore import QProcess
+        self._stop_play()
+        self._play_proc = QProcess(self)
+        self._play_proc.finished.connect(self._on_play_finished)
+        self._play_proc.errorOccurred.connect(self._on_play_error)
+        self._play_proc.start(
+            _bin("ffplay"),
+            ["-autoexit", "-nodisp", "-loglevel", "error", self._current()])
+        self._btn_play.setText("■ Stop")
+
+    def _on_play_error(self, _err) -> None:
+        self._set_status("Playback unavailable (ffplay not found)")
+        self._teardown_play()
+
+    def _on_play_finished(self, *_a) -> None:
+        self._teardown_play()
+
+    def _teardown_play(self) -> None:
+        proc = self._play_proc
+        self._play_proc = None
+        if proc is not None:
+            proc.deleteLater()
+        self._btn_play.setText("▶ Play")
+        if self._btn_play.isChecked():
+            self._btn_play.blockSignals(True)
+            self._btn_play.setChecked(False)
+            self._btn_play.blockSignals(False)
+
+    def _stop_play(self) -> None:
+        proc = self._play_proc
+        self._play_proc = None
+        if proc is not None:
+            try:
+                proc.finished.disconnect()
+                proc.errorOccurred.disconnect()
+            except Exception:
+                pass
+            proc.kill()
+            proc.waitForFinished(100)
+            proc.deleteLater()
+        self._btn_play.setText("▶ Play")
+
+    def closeEvent(self, ev) -> None:
+        self._stop_play()
+        for _t in list(self._temps):
+            try:
+                os.remove(_t)
+            except OSError:
+                pass
+        self._temps.clear()
+        super().closeEvent(ev)
 
     def _on_save_as(self):
         path, _sel = QFileDialog.getSaveFileName(
@@ -5364,13 +5419,20 @@ class MainWindow(QMainWindow):
 
     # ── Changelog ────────────────────────────────────────────
 
-    APP_VERSION = "1.5"
+    APP_VERSION = "1.6"
     _SPLIT_HEADER_H = 22  # deck split-column header height (keep both deck spots in sync)
     _WAVE_MIN_VIEW = 3.0  # minimum waveform view window (seconds)
     _MERGE_CURVES = (("Triangular", "tri"), ("Exponential", "exp"),
                      ("Logarithmic", "log"), ("Quarter sine", "qsin"),
                      ("Half sine", "hsin"))
     CHANGELOG: list[tuple[str, list[str]]] = [
+        ("1.6", [
+            "<b>Destructive clip editor</b> — <b>✎ Edit clip…</b> in the Audio "
+            "tab opens the current area in an editor: drag to select a region "
+            "and <b>Delete</b>, <b>Silence</b>, <b>Reverse</b>, or <b>Trim to "
+            "selection</b>, with <b>undo/redo</b> and audition, then <b>Save "
+            "as…</b>. Non-destructive — the original is never touched.",
+        ]),
         ("1.5", [
             "<b>Interactive waveform</b> — the Audio tab's waveform is now a "
             "selection surface: <b>drag the in/out handles</b> (or drag a new "