Lineage graph filter toggles: Sources, Usage, Errors

The Lineage view on the Dataset Details page now has three filter toggles — Show Sources, Show Usage, and Show Errors — for cutting noise on busy graphs.

Show Sources and Show Usage hide upstream-only or downstream-only nodes, with the currently selected dataset always visible; at least one direction stays on, so turning off the active one auto-flips the other. Show Errors hides any branch that contains no error nodes while preserving the full path from the root to each error. Defaults on every page load are Sources on, Usage on, Errors off — selections aren't persisted between visits.