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

engine.spec

@@ -2,24 +2,32 @@
 # Chay: pyinstaller engine.spec --clean --noconfirm (tren Windows)
 # -*- mode: python ; coding: utf-8 -*-
 
+import os
 from PyInstaller.utils.hooks import collect_dynamic_libs, collect_submodules
 
 # Native DLL cho pedalboard va soundfile
 binaries = collect_dynamic_libs('pedalboard')
 binaries += collect_dynamic_libs('soundfile')
 
+# Root tuyet doi cua thu muc chua spec — datas PHẢI absolute: PyInstaller
+# resolve duong dan relative theo CWD luc chay lenh (KHONG theo spec file),
+# chay tu noi khac -> khong tim thay -> bo qua am tham -> app/static thieu
+# trong bundle -> RuntimeError 'app\static does not exist' luc chay (da gap).
+_SPEC_ROOT = os.path.abspath(SPECPATH)
+
 # Assets doc (read-only) + thu muc storage (khoi tao rong; khi frozen,
 # config.py chuyen storage sang %APPDATA%\SonicForgeDAW\storage)
 datas = [
-    ('app/templates', 'app/templates'),   # index.html, favicon.svg
-    ('app/static', 'app/static'),         # js/css/processors
-    ('app/storage', 'app/storage'),
-    ('md', 'md'),                         # /ai-prompt-generator
+    (os.path.join(_SPEC_ROOT, 'app', 'templates'), 'app/templates'),   # index.html, favicon.svg
+    (os.path.join(_SPEC_ROOT, 'app', 'static'), 'app/static'),         # js/css/processors
+    (os.path.join(_SPEC_ROOT, 'app', 'models'), 'app/models'),         # project_schema.json (projects.py)
+    (os.path.join(_SPEC_ROOT, 'app', 'storage'), 'app/storage'),
+    (os.path.join(_SPEC_ROOT, 'md'), 'md'),                            # /ai-prompt-generator
 ]
 
 a = Analysis(
     ['desktop_engine.py'],
-    pathex=['.'],
+    pathex=[_SPEC_ROOT],
     binaries=binaries,
     datas=datas,
     hiddenimports=collect_submodules('celery.fixups') + [