build(deps): enable Win32_UI_WindowsAndMessaging for startup error dialog

src-tauri/Cargo.toml

@@ -99,6 +99,7 @@ windows = { version = "0.58", features = [
     "Win32_Devices_DeviceAndDriverInstallation",  # SetupAPI: NPU detection (Phase 3, T3.4)
     "Win32_System_Com",
     "Win32_UI_Shell",             # SetCurrentProcessExplicitAppUserModelID (Phase 8, T8.6)
+    "Win32_UI_WindowsAndMessaging",  # MessageBoxW: fatal-startup error dialog (see run())
     "UI_Notifications",           # scheduled toast reminders (Phase 8, T8.6, FR-CAL-5) — the
     "Data_Xml_Dom",               # OS delivers these itself at the due time, no polling timer
     "Foundation",