v0.2.17

Light glass casts a shadow, so it stands off a white page, and a hovered bookmark card stays opaque.

Fixed

• Light Glass::Regular casts theme::surface_shadows, as macOS light glass does: over a white page, such as a floating window::content card, its white lift and rim left it with no edge.
• A hovered bookmark card lays its wash over its own fill instead of replacing it, so a link's hover card no longer turns see-through under the pointer.