parseDashboardPositionalArgs explicit org

Trap: passing dashboard view 8757333 --sixel looks like an ID-only lookup, but a single positional argument is only the dashboard ref; organization resolution still needs configured context. With no default org, it is interpreted during target resolution and fails as an organization lookup. Fix: pass an explicit organization target, e.g. dashboard view byk/ 8757333 --sixel. For dashboard lists, one bare argument without / is always a title filter; use org/ or org 'filter' to select an organization.