feat: primitive styling

client/world/primitive.go

@@ -13,6 +13,11 @@ type MapItem interface {
 type Point struct {
 	Id   uuid.UUID
 	X, Y int
+
+	// Priority controls per-object draw ordering. Smaller draws earlier.
+	Priority int
+	// StyleID references a resolved style in the world's style table.
+	StyleID StyleID
 }
 
 // Line is a line segment primitive in fixed-point world coordinates.
@@ -20,6 +25,11 @@ type Line struct {
 	Id     uuid.UUID
 	X1, Y1 int
 	X2, Y2 int
+
+	// Priority controls per-object draw ordering. Smaller draws earlier.
+	Priority int
+	// StyleID references a resolved style in the world's style table.
+	StyleID StyleID
 }
 
 // Circle is a circle primitive in fixed-point world coordinates.
@@ -27,6 +37,11 @@ type Circle struct {
 	Id     uuid.UUID
 	X, Y   int
 	Radius int
+	// Priority controls per-object draw ordering. Smaller draws earlier.
+	Priority int
+
+	// StyleID references a resolved style in the world's style table.
+	StyleID StyleID
 }
 
 // ID returns the point identifier.