feat(advisor-comparison): add 相比上次运行 panel to report detail page

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

webapp/static/js/report.js

@@ -31,6 +31,7 @@ const Report = {
       Report.renderDistribution(detail.report);
       Report.renderGroupings(detail.report);
       Report.renderLowest(detail.report);
+      Report.renderAdvisorComparison(detail.report);
       Report.renderAdvice(detail.summary, detail.report);
       Report.renderTokenUsage(detail.report);
       content.style.opacity = "1";
@@ -275,6 +276,61 @@ const Report = {
     wrap.innerHTML = `<table class="group-table">${head}${body}</table>`;
   },
 
+  // 相比上次运行的顾问诊断对比（同 scenario_name 的最近一次前序运行，自动匹配）。
+  renderAdvisorComparison(report) {
+    const section = document.getElementById("advisor-comparison-section");
+    const meta = document.getElementById("advisor-comparison-meta");
+    const body = document.getElementById("advisor-comparison-body");
+    if (!section || !meta || !body) return;
+
+    const comparison = report.advisor_comparison;
+    if (!comparison || !comparison.entries || comparison.entries.length === 0) {
+      section.hidden = true;
+      return;
+    }
+
+    section.hidden = false;
+    meta.textContent = `对比：${comparison.previous_run_id}（${App.shortTime(comparison.previous_finished_at)}）`;
+
+    const STATUS_LABEL = {
+      resolved: "✅ 已改善",
+      regressed: "⚠️ 新触发",
+      still_triggered: "❌ 仍未解决",
+      new_metric: "🆕 新增指标",
+    };
+    const STATUS_CLASS = {
+      resolved: "delta-good",
+      regressed: "delta-bad",
+      still_triggered: "delta-bad",
+      new_metric: "delta-flat",
+    };
+
+    const fmt = (v) => (v === null || v === undefined ? "—" : Number(v).toFixed(2));
+
+    let rows = "";
+    comparison.entries.forEach((entry) => {
+      const label = STATUS_LABEL[entry.status] || entry.status;
+      const cls = STATUS_CLASS[entry.status] || "delta-flat";
+      const d = MetricPresenter.deltaInfo(entry.metric, entry.current_score, entry.previous_score);
+      const deltaHtml = d.hasData && d.delta !== 0
+        ? ` <span class="hist-delta ${d.cls}">${d.arrow}${d.magnitude}</span>`
+        : "";
+      rows += `
+        <div class="advisor-comparison-row">
+          <span class="advisor-comparison-status ${cls}">${label}</span>
+          <span class="advisor-comparison-metric">${App.escape(App.shortMetric(entry.metric))}</span>
+          <span class="advisor-comparison-scores">${fmt(entry.previous_score)} → ${fmt(entry.current_score)}${deltaHtml}</span>
+        </div>`;
+    });
+
+    let caveat = "";
+    if (comparison.judge_model_changed) {
+      caveat = `<p class="muted tiny">⚠️ judge_model 不同（${App.escape(comparison.previous_judge_model)} → ${App.escape(comparison.current_judge_model)}），对比仅供参考。</p>`;
+    }
+
+    body.innerHTML = rows + caveat;
+  },
+
   // ④ 最低分样本逐条复核表（点击展开）。
   renderLowest(report) {    const wrap = document.getElementById("lowest-table");
     const samples = report.lowest_samples || [];