三段高度按 20/60/20 计算，面板高度可配置：-Dpanel.h=<像素>（默认 984，run.sh 支持 PANEL_H 环境变量）——4K 屏窗口更大时用得上

viewpanel/run.sh

@@ -37,6 +37,7 @@ cmd = [jx,
        "-Dspine.payload=" + pay,
        "-Dspine.resources=" + here + "/resources",
        "-Dspine.compat=" + here + "/compat-classes",
+       "-Dpanel.h=" + (os.environ.get("PANEL_H") or "984"),
        "-Dspine.classes=" + here + "/build/classes",
        "-Duser.home=" + root + "/spine-lab/home",
        "-cp", here + "/build/classes:" + root + "/tools/asm/asm.jar:" + root + "/tools/asm/asm-tree.jar",