ElyMark: the probe also requires each task box drawn (R2.14)

apps/ely-mark/examples/markprobe.rs

@@ -63,7 +63,8 @@ const CHECK: &str = r#"
         const line = range.getClientRects()[0];
         const top = item.getBoundingClientRect().top + parseFloat(mark.marginTop);
         const size = parseFloat(getComputedStyle(item).fontSize);
-        return [parseFloat(mark.width) / size, parseFloat(mark.height) / size, top + parseFloat(mark.height) / 2 - (line.top + line.height / 2)];
+        const drawn = mark.content !== 'none' && parseFloat(mark.borderTopWidth) > 0 && mark.borderTopStyle !== 'none';
+        return [parseFloat(mark.width) / size, parseFloat(mark.height) / size, top + parseFloat(mark.height) / 2 - (line.top + line.height / 2), drawn];
       }),
       cells: view.querySelectorAll('.milkdown td').length,
       notes: view.querySelectorAll('[data-type="footnote_definition"]').length,

tasks/reviews/R2.14-r2.md

@@ -0,0 +1,3 @@
+FAIL
+
+apps/ely-mark/examples/markprobe.rs:60（tests/scripts/mark-content.sh:66）：任务框回归只读取伪元素的计算样式，遗漏任务框实际生成及可见性的断言。复现：在独立副本中仅删除 main.css:121 的 `content: '';`，重新构建并完整运行 `bash tests/scripts/mark-content.sh`，原生窗口截图中已勾选和未勾选框均消失，脚本仍以 0 退出并输出 `ok: mark content (background share 0.9458)`；visual、themed、preview 三阶段的两个框仍各报告 `[1,1,0.04688]`，会放过违反 R2.14 的任务框消失回退。修复方向：逐项校验伪元素确已生成且可见，并加入删除 `content` 声明的负例，使框消失触发测试失败。

tests/scripts/mark-content.sh

@@ -63,8 +63,8 @@ for step in ("visual", "themed", "preview"):
                        ("cells", 2), ("notes", 1), ("font", True), ("editors", 1)]:
         want(step, key, value)
     # Every task box: text-sized, centred on its line.
-    for width, height, off in seen[step]["boxes"]:
-        if abs(width - 1) > 0.01 or abs(height - 1) > 0.01 or abs(off) > 1:
+    for width, height, off, drawn in seen[step]["boxes"]:
+        if not drawn or abs(width - 1) > 0.01 or abs(height - 1) > 0.01 or abs(off) > 1:
             sys.exit(f"FAIL: {step} task boxes are {seen[step]['boxes']}")
     blocks = seen[step]["blocks"]
     if [block["language"] for block in blocks] != languages: