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code/g3soft-libs/packages/ui/probe-pixel-sweep.mjs

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+import { chromium } from '@playwright/test'
+
+/**
+ * 方案验证：外框底边若改用 inset box-shadow（画在 padding box 内侧、覆盖在上层），
+ * 是否能"永远赢"——即无论最后一行是否贴近，视觉上只有一条线。
+ *
+ * 先做纯 CSS 实验：在页面上注入覆盖样式，然后逐像素扫描底边，
+ * 数出「深色像素的数量」，1 条 = 正确，2 条 = 双线，0 条 = 缺线。
+ */
+const BASE = process.env.PROBE_URL || 'http://localhost:5200'
+const browser = await chromium.launch()
+const page = await browser.newPage({ viewport: { width: 1400, height: 1200 } })
+await page.goto(BASE, { waitUntil: 'networkidle' })
+
+const clipSample = async (x, y, w, h) => {
+  const shot = await page.screenshot({ clip: { x, y, width: w, height: h } })
+  return page.evaluate(async (dataUrl) => {
+    const img = new Image()
+    await new Promise((res) => {
+      img.onload = res
+      img.src = dataUrl
+    })
+    const cv = document.createElement('canvas')
+    cv.width = img.width
+    cv.height = img.height
+    const ctx = cv.getContext('2d')
+    ctx.drawImage(img, 0, 0)
+    const d = ctx.getImageData(0, 0, img.width, img.height).data
+    const out = []
+    for (let i = 0; i < d.length; i += 4) out.push([d[i], d[i + 1], d[i + 2]])
+    return out
+  }, `data:image/png;base64,${shot.toString('base64')}`)
+}
+
+const scan = async (label, h) => {
+  await page.evaluate((hh) => {
+    const wrap = document.querySelector('[data-testid="table-wrap"]')
+    wrap.style.height = `${hh}px`
+  }, h)
+  await page.waitForTimeout(500)
+
+  // 必须先把表格滚进视口：page.screenshot 的 clip 用视口坐标，页面下方的元素会落空
+  const wrapLoc = page.locator('[data-testid="table-wrap"]')
+  await wrapLoc.scrollIntoViewIfNeeded()
+  await page.waitForTimeout(200)
+
+  const geo = await page.evaluate(() => {
+    const wrap = document.querySelector('[data-testid="table-wrap"]')
+    const root = wrap.querySelector('.g3-table')
+    const r = root.getBoundingClientRect()
+    return {
+      left: Math.round(r.left),
+      // getBoundingClientRect 已是视口坐标，直接可用
+      bottom: Math.round(r.bottom),
+      isBodyFill: root.classList.contains('is-body-fill'),
+    }
+  })
+
+  // 采样窗口必须完整落在视口内
+  const y0 = Math.max(0, geo.bottom - 4)
+  const available = 1200 - y0
+  if (available < 8) {
+    console.log(`${label} h=${h}  跳过（采样窗口超出视口）`)
+    return null
+  }
+
+  const px = await clipSample(geo.left + 300, y0, 1, 8)
+  const dark = px.map(([r, g, b]) => (r < 246 || g < 246 || b < 246 ? 1 : 0))
+  const count = dark.reduce((a, b) => a + b, 0)
+  console.log(
+    `${label} h=${String(h).padStart(3)}  bodyFill=${String(geo.isBodyFill).padStart(5)}  底边纵向像素: ${dark.join('')}  → ${count === 1 ? '一条线 ✅' : count === 0 ? '缺线 ❌' : count + ' 条 ❌'}`,
+  )
+  return count
+}
+
+console.log('========== 修复前（当前实现）==========')
+for (const h of [400, 200, 140, 130, 128, 127, 126, 125, 124, 120, 100, 80, 60]) {
+  await scan('before', h)
+}
+
+await browser.close()