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fix: 空任务栏渲染出字面 "[]"——each_window 块返回值不外泄 - #1
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wm.each_window 返回 @order.get.each 的结果，窗口全关时 Taskbar 的块 返回 []，被渲染层 tos 成可见 "[]" 文本。显式返回 nil，附回归测试 test_taskbar_empty_renders_no_brackets。
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问题
窗口全部关闭时，Taskbar 左侧出现可见的字面
[]文本：wm.each_window返回@order.get.each的结果，空表时块返回[]，被渲染层 tos 成文本节点。修复
each_window显式返回nil，块返回值不再外泄。测试
test_taskbar_empty_renders_no_brackets（渲染空 WM 任务栏 refute[]）bundle exec rake81 项全绿（含 Opal 编译验收）