FIX (lan 2): bundle app assets qua collect_data_files (import-system) + fallback static dir trong main.py + verify TOC trong build_windows.ps1

build_windows.ps1

@@ -14,6 +14,30 @@ node build.mjs   # @babel/standalone; thay cho 'npm run build' (Babel 8 ESM-only
 Write-Host "== [3/6] Build daw_engine.exe (PyInstaller) =="
 pyinstaller engine.spec --clean --noconfirm
 
+Write-Host "== [3.5/6] Verify bundle contents (app/static, app/templates phải có) =="
+# Bắt lỗi bundle NGAY tại build (đã gặp 2 lần: chạy pyinstaller từ nơi khác
+# -> static/templates thiếu -> exe crash 'Directory ...\app\static does not exist').
+$missing = @()
+if (-not (Test-Path "build\engine\Analysis-00.toc")) {
+  # PyInstaller 6.x: đọc TOC trực tiếp từ Analysis
+  $tocFiles = Get-ChildItem "build\engine" -Filter "*.toc" -ErrorAction SilentlyContinue
+  if ($tocFiles) {
+    $tocContent = Get-Content $tocFiles[0].FullName -Raw
+    if ($tocContent -notmatch "app/static") { $missing += "app/static" }
+    if ($tocContent -notmatch "app/templates") { $missing += "app/templates" }
+  }
+} else {
+  $tocContent = Get-Content "build\engine\Analysis-00.toc" -Raw
+  if ($tocContent -notmatch "app/static") { $missing += "app/static" }
+  if ($tocContent -notmatch "app/templates") { $missing += "app/templates" }
+}
+if ($missing.Count -gt 0) {
+  Write-Host "ERROR: Bundle thiếu: $($missing -join ', '). Dừng build — kiểm tra engine.spec datas!" -ForegroundColor Red
+  exit 1
+} else {
+  Write-Host "OK: app/static + app/templates có trong bundle." -ForegroundColor Green
+}
+
 Write-Host "== [4/6] Sidecar binary -> src-tauri/binaries (tauri triple naming) =="
 New-Item -ItemType Directory -Force src-tauri\binaries | Out-Null
 Copy-Item dist\daw_engine.exe src-tauri\binaries\daw_engine-x86_64-pc-windows-msvc.exe -Force