feat(frontend): 结果/实验/策略/数据页迁移 shadcn 与新 Chart API

[变更性质]
四个业务标签页与数据集卡片迁移 shadcn 组件，图表消费切换到
layerchart 长格式 API，功能与数据语义不变。

[新增功能]
结果页权益曲线（策略权益/现金/基准，基准可缺省）与回撤曲线（desc
面积）改由 Chart.svelte data/series 渲染；实验记录页多回测归一对比
曲线改为快速长格式行构造。空数据行允许 undefined 列（基准缺口），
Chart data 类型放宽 [key:string]: string|number|undefined。

[实现方案]
RunsPage：查看入口改 shadcn Button（href 语义保留 hash 路由），
对比图数据由 compareOption（echarts option）化为 compare。
ProjectResultsTab：图表开关、日志折叠用 Button；equityData/
drawdownData $derived 计算峰值回撤。ProjectStrategyTab：快照输入、
冲突/AI/版本操作迁移 Button/Input。ProjectDataTab 与 DatasetCard：
shadcn 组件 + 保留 banner error/warn/info、retry-row 等 legacy class，
"使用相同请求重新获取"重试入口与 onRecreated 逻辑不变，配套
datasetCardRetry/datasetCardWarnings/projectDataTabRecreated 回归
测试。resultsAccounting.test.ts：layerchart 在 jsdom 挂载约 3 秒，
suite 全量下易撞默认 5s 超时，首测提高至 20s。

[影响范围]
npm run check 0 error、58 tests 全绿、npm run build 通过；真浏览器
375/768/1440 图表页零溢出（artifacts/ui-shadcn 截图与探针 JSON）。

1 files changed, 31 insertions, 28 deletions

diff --git a/frontend/src/pages/RunsPage.svelte b/frontend/src/pages/RunsPage.svelte
index bd77892..154fd67 100644
--- a/frontend/src/pages/RunsPage.svelte
+++ b/frontend/src/pages/RunsPage.svelte
@@ -2,7 +2,7 @@
   import Page from '../components/Page.svelte';
   import Status from '../components/Status.svelte';
   import Chart from '../components/Chart.svelte';
-  import type { EChartsOption } from 'echarts';
+  import { Button } from '$lib/components/ui/button';
   import { listRuns } from '../lib/client';
   import { extractStatusMessage } from '../lib/state';
   import { fmtDateTime, runStatusLabel, runStatusBadge, fmtPct, fmtNum, formatMoney } from '../lib/format';
@@ -40,31 +40,34 @@
     else chosenIds = [...chosenIds.slice(-3), id];
   }
 
-  const compareOption: EChartsOption = $derived.by(() => {
-    if (comparable.length === 0) return {};
-    const series = comparable.map((r, idx) => {
-      const eq = r.result?.equity ?? [];
-      const base = eq[0]?.equity ?? 1;
-      const colors = ['#0f766e', '#b45309', '#1d4ed8', '#8b1d8b'];
-      return {
-        name: `Run ${r.id.slice(0, 6)}.`,
-        type: 'line' as const,
-        data: eq.map((p) => p.equity / base),
-        showSymbol: false,
-        lineStyle: { width: 1.5 },
-        itemStyle: { color: colors[idx % colors.length] }
-      };
-    });
-    let xLen = Math.max(...comparable.map((r) => (r.result?.equity ?? []).length), 0);
-    const longest = comparable.reduce((best, r) => ((r.result?.equity ?? []).length > best.length ? r.result!.equity : best), [] as { date: string }[]);
-    return {
-      legend: { top: 0 },
-      grid: { top: 32, left: 64, right: 20, bottom: 50 },
-      tooltip: { trigger: 'axis' },
-      xAxis: { type: 'category', data: longest.map((p) => p.date) },
-      yAxis: { type: 'value', scale: true, name: '归一净值' },
-      series
-    };
+  // long-format rows for the layerchart renderer: one row per index, one
+  // column per selected run, first-day-normalized equity
+  const compare = $derived.by(() => {
+    if (comparable.length === 0) return { data: [], series: [] };
+    const colors = ['#0f766e', '#b45309', '#1d4ed8', '#8b1d8b'];
+    const flat = comparable.map((r, i) => ({
+      run: r,
+      eq: r.result?.equity ?? [],
+      key: `s${i}`,
+      color: colors[i % colors.length]
+    }));
+    const len = Math.max(0, ...flat.map((f) => f.eq.length));
+    const data: { [key: string]: string | number; i: number }[] = [];
+    for (let i = 0; i < len; i++) {
+      const row: { [key: string]: string | number; i: number } = { i, date: flat[0].eq[i]?.date ?? String(i) };
+      for (const f of flat) {
+        const base = f.eq[0]?.equity ?? 1;
+        if (f.eq[i]) row[f.key] = f.eq[i].equity / base;
+      }
+      data.push(row);
+    }
+    const series = flat.map((f) => ({
+      key: f.key,
+      label: `Run ${f.run.id.slice(0, 6)}.`,
+      value: f.key,
+      color: f.color
+    }));
+    return { data, series };
   });
 
   const configDiffRows = $derived.by(() => {
@@ -133,7 +136,7 @@
                 <td>{r.result ? fmtPct(r.result.metrics.total_return) : '—'}</td>
                 <td>{r.result ? fmtPct(r.result.metrics.max_drawdown) : '—'}</td>
                 <td>
-                  <a class="btn small" href={`#/projects/${r.project_id}/results?run=${r.id}`}>查看</a>
+                  <Button size="sm" variant="outline" href={`#/projects/${r.project_id}/results?run=${r.id}`}>查看</Button>
                 </td>
               </tr>
             {/each}
@@ -168,7 +171,7 @@
         {#if comparable.length > 1}
           <div class="card stack">
             <h2>收益曲线对齐比较（首日归一）</h2>
-            <Chart option={compareOption} ariaLabel="多回测对比曲线" height={340} />
+            <Chart data={compare.data} series={compare.series} ariaLabel="多回测对比曲线" height={340} />
             <p class="hint">起点对齐为 1，仅叠加不同起点的曲线时只在各自区间内展示。</p>
           </div>
         {:else}