Appearance dialog (MODIFY > Appearance, A)

Library swatches by category (the engine's library when it offers one, else built-in looks:
metals, plastics, paints, woods, glass with opacity), the looks in this design, a colour picker
and opacity, and the objects to apply to (bodies/components or faces). A swatch dragged onto a
body or face in the viewport, or onto a body's row in the Browser, applies at once; Apply and
OK give the picked objects the current look; pre-selected bodies become the objects.

Browser: rows under a drag of another kind count as hovered, and the Browser's own drops no
longer swallow other payloads (egui's take_payload takes any type), so swatches dropped on its
rows land.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/engine/src/cmd/inspect.rs

@@ -26,6 +26,7 @@ pub static COMMANDS: &[CommandSpec] = &[
     CommandSpec::new("AppearanceCommand", "Appearance", appearance)
         .at("SOLID", "MODIFY")
         .icon("appearance")
+        .key("A")
         .params("bodies: [names]; color: \"#rrggbb\" or [r, g, b] (0–255), or null to follow the material"),
     CommandSpec::new("material.list", "List Materials", material_list).noundo(),
     CommandSpec::new("engine.commands", "List Commands", commands).noundo(),