Lineage graph: materialized datasets shown as a distinct node style with materialization details on click

The dataset lineage graph now shows stored (materialized) datasets differently from views, so you can tell them apart at a glance. Stored datasets render with their own node style, showing an "M" icon and with a blue shade.

Click any node to open its detail panel, which now includes a materialization section showing whether the dataset is stored and how it refreshes. This is available today in the lineage graph on the Dataset Details screen in Data Management.