FIX 3 van de Windows:

1. LOAD CHAM: PyInstaller onefile 723MB giai nen toan bo vao %TEMP% moi lan chay -> chuyen ONEDIR (engine.spec COLLECT) + bundle qua Tauri resources (resource_dir/daw_engine/daw_engine.exe) thay externalBin — khoi dong tuc thi khong giai nen
2. WINDOW PICKER: Tauri v2 khong co window.__TAURI__.dialog — goi invoke('plugin:dialog|open', {options:{directory:true}}) qua __TAURI__.core.invoke
3. ICON exe: bundle.icon chuyen icon.ico -> favicon.ico + thay 3 PNG bang favicon render
- build_windows.ps1 buoc 4: copy onedir dist/daw_engine -> src-tauri/resources/daw_engine

engine.spec

@@ -112,10 +112,8 @@ pyz = PYZ(a.pure, a.zipped_data, cipher=None)
 exe = EXE(
     pyz,
     a.scripts,
-    a.binaries,
-    a.zipfiles,
-    a.datas,
     [],
+    exclude_binaries=True,
     name='daw_engine',
     debug=False,
     bootloader_ignore_signals=False,
@@ -128,3 +126,14 @@ exe = EXE(
     # sinh boi tools/gen_favicon_ico.py). Cung nguon voi icon hien thi trong app.
     icon='src-tauri/icons/favicon.ico',
 )
+
+# ONEDIR (khong phai onefile): exe 700MB+ onefile phai giai nen toan bo vao
+# %TEMP% moi lan chay -> load RAT CHAM tren Windows. Onedir chay truc tiep tu
+# thu muc (bundle qua Tauri resources), khoi dong gan nhu tuc thi.
+coll = COLLECT(
+    exe,
+    a.binaries,
+    a.zipfiles,
+    a.datas,
+    name='daw_engine',
+)