libSceWebBrowserDialog technical debt

libSceWebBrowserDialog - sceWebBrowserDialogOpen and sceWebBrowserDialogOpenForPredeterminedContent run the common-dialog state machine without displaying an interactive browser, and sceWebBrowserDialogGetResult reports that the user cancelled. Minecraft Bedrock (PPSA17221) imports sceWebBrowserDialogOpenForPredeterminedContent (#5744). The 424-byte allow-list parameter and its twenty optional address pointers are validated, but address filtering is not modelled without an interactive browser. Main open-parameter validation remains incomplete.

sceWebBrowserDialogGetEvent, sceWebBrowserDialogNavigate, sceWebBrowserDialogSetZoom (libSceWebBrowserDialog) - their names and NIDs are in the PS5 3.20 export inventory; the no-parameter prototypes follow shadPS4 webbrowserdialog.cpp and are not measured on a console. They are declared without parameters solely to resolve known imports; this is not an ABI claim, and every call throws.