Overhaul: 5-task implementation

- Remove TURN decks (3/4), clean up MIDI, layout
- Single cart player with 3-item autoload queue + continue toggle
- Event logging (SessionLogger), mic tracking, large mic timer widget
- LUFS metering moved from external ports to internal master mix
- Master output WAV recording with top-bar REC toggle
- Music mix output (ch 3-8 only, no mics)
- Preview bar for playlist auditioning
- Merged show log with [SONG][CART][TALK] prefixes
- Live CSV writer for OBS song display (~/live_songs.csv)
- Misc fixes: preview race condition, datetime import for recording

mixer_widget.py

@@ -410,8 +410,8 @@ class LUFSExpandedSection(QFrame):
         self.engine = engine
         self._master = engine.mixer['master']
 
-        self.setFixedWidth(200)
-        self.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Expanding)
+        self.setMinimumWidth(160)
+        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
         self.setStyleSheet("""
             LUFSExpandedSection {
                 background-color: #181a1e;
@@ -484,6 +484,70 @@ class LUFSExpandedSection(QFrame):
         pass
 
 
+class MicTimerWidget(QFrame):
+    def __init__(self, engine, parent=None):
+        super().__init__(parent)
+        self.engine = engine
+
+        self.setMinimumWidth(120)
+        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
+        self.setStyleSheet("""
+            MicTimerWidget {
+                background-color: #181a1e;
+                border: 1px solid #282a30;
+                border-radius: 6px;
+            }
+        """)
+
+        root = QVBoxLayout(self)
+        root.setContentsMargins(8, 12, 8, 12)
+        root.setSpacing(4)
+
+        header = QLabel("MIC ON TIME")
+        header.setFont(QFont("Segoe UI", 9, QFont.Bold))
+        header.setAlignment(Qt.AlignCenter)
+        header.setStyleSheet("color: #556670; background: transparent; border: none;")
+        root.addWidget(header)
+
+        self.duration_label = QLabel("00:00")
+        self.duration_label.setFont(QFont("Courier New", 28, QFont.Bold))
+        self.duration_label.setAlignment(Qt.AlignCenter)
+        self.duration_label.setStyleSheet("color: #00cc66; background: transparent; border: none;")
+        root.addWidget(self.duration_label, stretch=1)
+
+        self.status_label = QLabel("MIC OFF")
+        self.status_label.setFont(QFont("Segoe UI", 10, QFont.Bold))
+        self.status_label.setAlignment(Qt.AlignCenter)
+        self.status_label.setStyleSheet("color: #444; background: transparent; border: none;")
+        root.addWidget(self.status_label)
+
+        self.timer = QTimer(self)
+        self.timer.setInterval(100)
+        self.timer.timeout.connect(self._refresh)
+        self.timer.start()
+
+    def _refresh(self):
+        dur = self.engine.get_mic_duration()
+        channels = self.engine.mixer['channels']
+        any_on = any(ch.mic_on for ch in channels[:2])
+
+        if any_on:
+            mins = int(dur // 60)
+            secs = int(dur % 60)
+            self.duration_label.setText(f"{mins:02d}:{secs:02d}")
+            self.duration_label.setStyleSheet("color: #00ff41; background: transparent; border: none;")
+            self.status_label.setText("MIC LIVE")
+            self.status_label.setStyleSheet("color: #ff4444; font-weight: bold; background: transparent; border: none;")
+        else:
+            self.duration_label.setText("00:00")
+            self.duration_label.setStyleSheet("color: #333; background: transparent; border: none;")
+            self.status_label.setText("MIC OFF")
+            self.status_label.setStyleSheet("color: #444; background: transparent; border: none;")
+
+    def apply_theme(self, theme: dict):
+        pass
+
+
 class MixerWidget(QFrame):
     def __init__(self, engine, parent=None):
         super().__init__(parent)
@@ -548,9 +612,6 @@ class MixerWidget(QFrame):
         self.master_pre = MasterPreSection(self.engine)
         channels_layout.addWidget(self.master_pre)
 
-        self.lufs_section = LUFSExpandedSection(self.engine)
-        channels_layout.addWidget(self.lufs_section)
-
         scroll.setWidget(scroll_content)
         root.addWidget(scroll)
 
@@ -558,7 +619,6 @@ class MixerWidget(QFrame):
         for strip in self._strips:
             strip.apply_theme(theme)
         self.master_pre.apply_theme(theme)
-        self.lufs_section.apply_theme(theme)
 
     def refresh_strips(self):
         for strip in self._strips: