FIX: Windows build crash 'app\static does not exist' (datas absolute + APP_DIR freeze-aware) + VU meter ARM/MIDI keyboard

app/main.py

@@ -58,7 +58,10 @@ app.add_middleware(
 # Mount storage directory (must come before general /static mount)
 app.mount("/static/audio", StaticFiles(directory=settings.STORAGE_DIR), name="audio")
 # Mount app static files (js, css)
-STATIC_DIR = os.path.join(os.path.dirname(__file__), "static")
+# Dùng settings.APP_DIR (freeze-aware) thay vì os.path.dirname(__file__):
+# khi PyInstaller onefile, __file__ trỏ vào thư mục giải nén tạm _MEI...
+# nhưng static/templates nằm trong sys._MEIPASS/app (config.py đã xử lý).
+STATIC_DIR = os.path.join(settings.APP_DIR, "static")
 app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")
 
 # Include routers

app/static/js/app.jsx

@@ -25744,8 +25744,18 @@ STRICT CONSTRAINTS:
       try {
       // Khi STOP (không play, không recording): vẽ VU RỖNG — không đọc analyser/
       // activity → hết animation dính + master không full sau khi dừng play.
+      // ⚠️ NGOẠI LỆ: nếu có MIDI activity live (bật ARM track + bấm phím MIDI
+      // keyboard — KHÔNG play/record) thì KHÔNG early-return — track VU phải
+      // nhảy theo midiVuActivityRef + decay (user bug: ARM + phím MIDI → VU
+      // đứng yên vì block này vẽ rỗng và return trước khi đọc activity).
       const isRecActive = activeAudioRecordersRef.current && Object.keys(activeAudioRecordersRef.current).length > 0;
-      if (!isPlaying && !isRecActive) {
+      let liveMidiVu = false;
+      try {
+        for (const _k in midiVuActivityRef.current) {
+          if (midiVuActivityRef.current[_k] > 0.001) { liveMidiVu = true; break; }
+        }
+      } catch (e) { }
+      if (!isPlaying && !isRecActive && !liveMidiVu) {
         setMasterVU(0);
         setMasterMeterPeak(0);
         Object.keys(trackVuRefs.current).forEach(k => {

app/templates/index.html

@@ -24,7 +24,7 @@
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202608070950" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608081200" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {