NEO-85: Drop dead emission props on unshaded dummy highlight.

Bugbot: emission_* on SHADING_MODE_UNSHADED materials has no visible effect
without glow; lock highlight is albedo-only. Add GdUnit coverage for albedo
brightening without emission.

client/scripts/prototype_target_markers.gd

@@ -91,15 +91,11 @@ func _apply_highlight_states() -> void:
 		var highlighted: bool = target_id == _locked_target_id and not _locked_target_id.is_empty()
 		if highlighted:
 			body_mat.albedo_color = tint.lightened(0.25)
-			body_mat.emission_enabled = true
-			body_mat.emission = tint
-			body_mat.emission_energy_multiplier = 1.4
 			var ring_c := tint
 			ring_c.a = 0.78
 			ring_mat.albedo_color = ring_c
 		else:
 			body_mat.albedo_color = Color(tint.r, tint.g, tint.b, 0.88)
-			body_mat.emission_enabled = false
 			var ring_c2 := tint
 			ring_c2.a = 0.45
 			ring_mat.albedo_color = ring_c2

client/test/prototype_target_markers_test.gd

@@ -0,0 +1,25 @@
+extends GdUnitTestSuite
+
+## NEO-85: lock highlight uses albedo-only tuning on unshaded dummy materials.
+
+const Markers := preload("res://scripts/prototype_target_markers.gd")
+
+const ALPHA_ID := "prototype_target_alpha"
+
+
+func test_set_locked_target_brightens_body_albedo_without_emission() -> void:
+	# Arrange
+	var markers: Node3D = Markers.new()
+	auto_free(markers)
+	add_child(markers)
+	await get_tree().process_frame
+	var body: MeshInstance3D = markers.get_node(
+		"Marker_%s/DummyBody" % ALPHA_ID
+	) as MeshInstance3D
+	var body_mat: StandardMaterial3D = body.material_override as StandardMaterial3D
+	var idle_color: Color = body_mat.albedo_color
+	# Act
+	markers.set_locked_target(ALPHA_ID)
+	# Assert
+	assert_that(body_mat.albedo_color).is_not_equal(idle_color)
+	assert_that(body_mat.emission_enabled).is_false()

client/test/prototype_target_markers_test.gd.uid

@@ -0,0 +1 @@
+uid://cneo85ptgtmarkers1