iter16ui T5：P4乙panel切片8→16（PANEL_SLICE单点，button 8/仪式框12维持）+Q1丙panel_skinned工厂content margin clamp（低于切片自动抬平，9消费面7处受益调用点零改）+P5甲圆角收敛RADIUS_OBJECT=5单点（26处2/3/4/5/6/8档归一；例外17底座/200金印/100脉冲环保留）+bcard选中底字面量退役归PANEL_DATA+art-bible §7.1圆角单点与九宫格切片两条注记双侧落文；轻闸冒烟782/0+probe_gate --click全绿（click done=true 问题=0）

game/presentation/views/board_view.gd

@@ -739,10 +739,10 @@ func _paint_cell(c: Vector2i, hero: Vector2i) -> void:
 		tile = _floor_tile_for(c) if revealed else _wall_tile_for(c)
 	else:
 		# 素材整批缺位回退 = 现行程序化平色路径（fresh checkout 冒烟不炸——任务书 §2.2）
-		sb = UiKit.panel_flat(bg, bg.darkened(0.15), 3)
+		sb = UiKit.panel_flat(bg, bg.darkened(0.15),UiKit.RADIUS_OBJECT)
 	if is_hero:
 		if sb == null:
-			sb = UiKit.panel_flat(Color.TRANSPARENT, Color.TRANSPARENT, 3, 0)
+			sb = UiKit.panel_flat(Color.TRANSPARENT, Color.TRANSPARENT,UiKit.RADIUS_OBJECT, 0)
 		sb.set_border_width_all(3)
 		sb.border_color = COL_HERO
 		if glyph == "" and _hero_tex_idle == null: