The Wails notifications service reads HKCU\Software\Classes\AppUserModelId\
<AppName>\CustomActivator on first startup; if present it uses that GUID
as the toast activator CLSID, otherwise it generates a fresh UUID and
writes it back. Without an installer-supplied value the per-machine GUID
diverges from the ToastActivatorCLSID baked into the Start Menu and
Desktop shortcuts, and the COM activator never fires when a toast is
clicked. Seed the same CLSID the shortcuts use so the two sides match.
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