engine: sync editor rendering and ui changes

engine/assets/builtin/shaders/object-id-outline.shader

@@ -46,7 +46,14 @@ Shader "Builtin Object Id Outline"
 
     bool IsSelectedObject(float4 objectIdColor)
     {
-        if (objectIdColor.a <= 0.0) {
+        // Object-id surfaces encode the low 32 bits across RGBA, so low-valued
+        // runtime ids legitimately have zero alpha. Only the all-zero clear
+        // color should be treated as "no object".
+        if (all(abs(objectIdColor) <= float4(
+                0.0025,
+                0.0025,
+                0.0025,
+                0.0025))) {
             return false;
         }