libSceUsbStorageDialog technical debt

libSceUsbStorageDialog (libSceUsbStorageDialog) - the USB storage dialog runs the common-dialog state machine without showing a UI and reports the dialog as canceled by the user (COMMON_DIALOG_RESULT_USER_CANCELED = 1). sceUsbStorageDialogOpen transitions to RUNNING (2), while sceUsbStorageDialogUpdateStatus and sceUsbStorageDialogClose transition to FINISHED (3) before returning results, matching other common dialogs in the repository.

sceUsbStorageDialogGetResult (libSceUsbStorageDialog) - SceUsbStorageDialogResult full layout, size and additional fields are unverified across open references (KytyPS5, shadPS4, fpPS4, SharpProspero); only the 4-byte result field (COMMON_DIALOG_RESULT_USER_CANCELED = 1) is written to avoid guest memory corruption
sceUsbStorageDialogOpen, sceUsbStorageDialogClose (libSceUsbStorageDialog) - the relative validation precedence between uninitialized state, busy/running state, and null parameter checks is inferred from standard common dialog conventions and unverified against real console firmware