Check that silent mode shows nothing, that show mode shows the PSN notice
when Open and Open2 succeed with a valid store parameter, that a null
parameter shows nothing, and that no notice is shown without a presenter.
The guest test links libSceIme.
Delegate sceNpCommerceDialogInitializeInternal to sceNpCommerceDialogInitialize, sharing dialog state and returning COMMON_DIALOG_ERROR_ALREADY_INITIALIZED on duplicate initialization, following shadPS4. Add regression tests in GuestNpCommerceDialog covering initial, duplicate, and post-termination initialization, and update technical debt documentation.