diff --git a/admin/src/utils/__tests__/statsRange.test.ts b/admin/src/utils/__tests__/statsRange.test.ts
index 3bb0cfe..2d574cd 100644
--- a/admin/src/utils/__tests__/statsRange.test.ts
+++ b/admin/src/utils/__tests__/statsRange.test.ts
@@ -1,12 +1,18 @@
 /**
- * 统计时间快捷范围单测（Phase 3 Task 4）
+ * 统计时间快捷范围单测（Phase 3 Task 4；Task 8 补自定义区间 resolveStatsRange）
  *
  * 钉住口径：from/to 为本地日期串 YYYY-MM-DD；"近 N 天"含今天往回共 N 天
  * （今天→from==to；近7天→from=今天-6；近30天→今天-29）——后端把日期-only
  * 的 to 视为含当日全天（stats_routes 的 _parse_dt），前端不传时间部分。
+ * 自定义档：完整且起≤止 → 原样透传；缺半/起>止 → null（调用方不发请求）。
  */
 import { describe, expect, it } from 'vitest'
-import { STATS_QUICK_RANGES, rangeToParams } from '@/utils/statsRange'
+import {
+  STATS_QUICK_RANGES,
+  STATS_RANGE_OPTIONS,
+  rangeToParams,
+  resolveStatsRange
+} from '@/utils/statsRange'
 
 /** 固定"现在"：2026-10-13 09:30（本地时间）——跨月/跨年边界另测 */
 const NOW = new Date(2026, 9, 13, 9, 30)
@@ -55,3 +61,43 @@ describe('统计时间快捷范围（src/utils/statsRange.ts）', () => {
     }
   })
 })
+
+describe('时间筛选档位解析（resolveStatsRange——Task 8 自定义区间）', () => {
+  it('快捷档等价 rangeToParams（custom 入参被忽略）', () => {
+    expect(resolveStatsRange('last7', null, NOW)).toEqual({ from: '2026-10-07', to: '2026-10-13' })
+  })
+
+  it('自定义完整区间：原样透传（不做时区/时间部分加工）', () => {
+    expect(resolveStatsRange('custom', ['2026-09-01', '2026-10-13'], NOW)).toEqual({
+      from: '2026-09-01',
+      to: '2026-10-13'
+    })
+  })
+
+  it('自定义起=止：单日闭区间合法', () => {
+    expect(resolveStatsRange('custom', ['2026-10-13', '2026-10-13'], NOW)).toEqual({
+      from: '2026-10-13',
+      to: '2026-10-13'
+    })
+  })
+
+  it('自定义缺半（null/空串）→ null（不发请求）', () => {
+    expect(resolveStatsRange('custom', null, NOW)).toBeNull()
+    expect(resolveStatsRange('custom', undefined, NOW)).toBeNull()
+    expect(resolveStatsRange('custom', ['', '2026-10-13'], NOW)).toBeNull()
+    expect(resolveStatsRange('custom', ['2026-10-13', ''], NOW)).toBeNull()
+  })
+
+  it('自定义起>止 → null（ISO 日期串字典序即时间序）', () => {
+    expect(resolveStatsRange('custom', ['2026-10-14', '2026-10-13'], NOW)).toBeNull()
+  })
+
+  it('筛选档位清单：三快捷档 + 自定义殿后（切换器展示序）', () => {
+    expect(STATS_RANGE_OPTIONS.map((item) => item.value)).toEqual([
+      'today',
+      'last7',
+      'last30',
+      'custom'
+    ])
+  })
+})
diff --git a/admin/src/utils/statsRange.ts b/admin/src/utils/statsRange.ts
index ae93a99..72baecc 100644
--- a/admin/src/utils/statsRange.ts
+++ b/admin/src/utils/statsRange.ts
@@ -39,3 +39,32 @@ export function rangeToParams(
     to: toDateKey(now)
   }
 }
+
+// ---- 自定义区间扩展（Phase 3 Task 8 统计分析页） ----------------------------------
+
+/** 时间筛选状态：快捷档 + 自定义（统计分析页；仪表盘只用快捷档） */
+export type StatsRangeFilter = StatsQuickRange | 'custom'
+
+/** 筛选档位清单（顺序即切换器展示序；自定义档配合日期区间选择器） */
+export const STATS_RANGE_OPTIONS: Array<{ value: StatsRangeFilter; label: string }> = [
+  ...STATS_QUICK_RANGES.map(({ value, label }) => ({ value, label })),
+  { value: 'custom', label: '自定义' }
+]
+
+/**
+ * 筛选状态 → {from, to} 查询参数（custom 需完整且起≤止的区间）
+ *
+ * 返回 null = 区间不完整/非法（自定义只选了一半、起>止）——调用方不发请求，
+ * 等 ElDatePicker 补全；快速档永不为 null。
+ */
+export function resolveStatsRange(
+  filter: StatsRangeFilter,
+  custom: [string, string] | null | undefined,
+  now: Date = new Date()
+): { from: string; to: string } | null {
+  if (filter !== 'custom') return rangeToParams(filter, now)
+  if (!custom || !custom[0] || !custom[1]) return null
+  const [from, to] = custom
+  if (from > to) return null // ISO 日期串字典序即时间序
+  return { from, to }
+}
diff --git a/admin/src/views/stats/overview/__tests__/charts.test.ts b/admin/src/views/stats/overview/__tests__/charts.test.ts
new file mode 100644
index 0000000..fc37643
--- /dev/null
+++ b/admin/src/views/stats/overview/__tests__/charts.test.ts
@@ -0,0 +1,157 @@
+/**
+ * 统计图表构建单测（Phase 3 Task 8）
+ *
+ * 钉住 charts.ts 纯函数层的口径与配色纪律：
+ * - fillTrendDates：窗口补零（含缺口日/边界日）、无界回退数据 min/max、空数据原样；
+ * - buildFunnelOption：y 类目倒序（会话在顶）、逐级转化标注、x 轴 max=会话数归一；
+ * - 意向环形：色随实体（零值过滤后幸存系列保留原槽位色，不因删行换色）；
+ * - recordEntries：降序 + 同数按 key 字典序（与后端 _sorted_counts 同规）、滤零。
+ */
+import { describe, expect, it } from 'vitest'
+import type { StatsFunnel, StatsTrendPoint } from '@/api/stats'
+import {
+  CHART_THEME_DARK,
+  CHART_THEME_LIGHT,
+  buildFunnelOption,
+  buildIntentPieOption,
+  fillTrendDates,
+  intentEntries,
+  recordEntries
+} from '../charts'
+
+describe('fillTrendDates（趋势按窗口补零）', () => {
+  it('窗口内缺口日补 {0,0}，输出按日升序', () => {
+    const trend: StatsTrendPoint[] = [
+      { date: '2026-10-13', conversations: 3, leads: 1 },
+      { date: '2026-10-10', conversations: 2, leads: 0 }
+    ]
+    const out = fillTrendDates(trend, '2026-10-10', '2026-10-13')
+    expect(out.map((p) => p.date)).toEqual([
+      '2026-10-10',
+      '2026-10-11',
+      '2026-10-12',
+      '2026-10-13'
+    ])
+    expect(out[1]).toEqual({ date: '2026-10-11', conversations: 0, leads: 0 })
+    expect(out[3]).toEqual({ date: '2026-10-13', conversations: 3, leads: 1 })
+  })
+
+  it('窗口恰好覆盖数据（from==to 单日）：原样单点', () => {
+    const trend = [{ date: '2026-10-13', conversations: 5, leads: 2 }]
+    expect(fillTrendDates(trend, '2026-10-13', '2026-10-13')).toEqual(trend)
+  })
+
+  it('跨月窗口补零（09-30 → 10-01 的日界推进）', () => {
+    const out = fillTrendDates(
+      [{ date: '2026-09-30', conversations: 1, leads: 0 }],
+      '2026-09-30',
+      '2026-10-01'
+    )
+    expect(out.map((p) => p.date)).toEqual(['2026-09-30', '2026-10-01'])
+  })
+
+  it('from/to 缺失或非法：回退数据自身 min/max', () => {
+    const trend: StatsTrendPoint[] = [
+      { date: '2026-10-12', conversations: 1, leads: 1 },
+      { date: '2026-10-10', conversations: 4, leads: 2 }
+    ]
+    const out = fillTrendDates(trend)
+    expect(out.map((p) => p.date)).toEqual(['2026-10-10', '2026-10-11', '2026-10-12'])
+    expect(fillTrendDates(trend, '2026-10-20', '2026-10-10')).toHaveLength(3) // 起>止回退
+  })
+
+  it('空趋势原样返回（空数据态由图表层处理）', () => {
+    expect(fillTrendDates([], '2026-10-01', '2026-10-13')).toEqual([])
+  })
+})
+
+describe('buildFunnelOption（漏斗横向条形）', () => {
+  const funnel: StatsFunnel = {
+    conversations: 100,
+    leads: 40,
+    evaluated: 30,
+    push_succeeded: 12
+  }
+
+  it('y 类目倒序录入使「会话」在顶；x 轴按会话数归一', () => {
+    const option = buildFunnelOption(funnel, CHART_THEME_LIGHT)
+    const yAxis = option.yAxis as { data: string[] }
+    expect(yAxis.data).toEqual(['推送成功', '评估完成', '留资', '会话'])
+    const xAxis = option.xAxis as { max: number }
+    expect(xAxis.max).toBe(100)
+  })
+
+  it('逐级标注：首级纯数量，其余 数量 · 占上一级%（40%→75%→40%）', () => {
+    const option = buildFunnelOption(funnel, CHART_THEME_LIGHT)
+    const series = option.series as Array<{
+      data: Array<{ value: number }>
+      label: { formatter: (params: { dataIndex: number }) => string }
+    }>
+    const labelAt = (index: number) => series[0].label.formatter({ dataIndex: index })
+    // dataIndex 0 是数组首位 = 倒序后的「推送成功」
+    expect(labelAt(0)).toBe('12 · 40%')
+    expect(labelAt(1)).toBe('30 · 75%')
+    expect(labelAt(2)).toBe('40 · 40%')
+    expect(labelAt(3)).toBe('100') // 首级无转化率
+  })
+
+  it('上级为 0 时只标数量（除零防护）；四级色取主题漏斗阶梯', () => {
+    const option = buildFunnelOption(
+      { conversations: 10, leads: 0, evaluated: 3, push_succeeded: 0 },
+      CHART_THEME_DARK
+    )
+    const series = option.series as Array<{
+      data: Array<{ value: number; itemStyle: { color: string } }>
+      label: { formatter: (params: { dataIndex: number }) => string }
+    }>
+    expect(series[0].label.formatter({ dataIndex: 1 })).toBe('3') // 上级 leads=0（除零防护）
+    expect(series[0].data.map((item) => item.itemStyle.color)).toEqual([...CHART_THEME_DARK.funnel].reverse())
+  })
+})
+
+describe('意向环形（色随实体，零值过滤不重排槽位）', () => {
+  it('intentEntries：滤零、保 INTENT_PIE_ORDER 固定序与槽位', () => {
+    const entries = intentEntries({ interested: 3, not_interested: 0, pending: 7 })
+    expect(entries).toEqual([
+      { name: '有意向', value: 3, slot: 0 },
+      { name: '待定', value: 7, slot: 2 }
+    ])
+    // 全零 → 空数组（图表走空态）
+    expect(intentEntries({ interested: 0, not_interested: 0, pending: 0 })).toEqual([])
+  })
+
+  it('buildIntentPieOption：系列色按固定槽位——首系列为零时幸存者不换色', () => {
+    const entries = intentEntries({ interested: 0, not_interested: 5, pending: 9 })
+    const option = buildIntentPieOption(entries, CHART_THEME_LIGHT)
+    const series = option.series as Array<{
+      data: Array<{ name: string; itemStyle: { color: string } }>
+    }>
+    // not_interested 恒为 slot 2 橙，不因 interested 缺席升位变蓝
+    expect(series[0].data[0].itemStyle.color).toBe(CHART_THEME_LIGHT.series[1])
+    expect(series[0].data[1].itemStyle.color).toBe(CHART_THEME_LIGHT.series[2])
+  })
+
+  it('中心合计 = 各片之和（总评估数）', () => {
+    const option = buildIntentPieOption(
+      intentEntries({ interested: 2, not_interested: 3, pending: 5 }),
+      CHART_THEME_LIGHT
+    )
+    expect((option.title as { text: string }).text).toBe('10')
+  })
+})
+
+describe('recordEntries（名义类目降序条目）', () => {
+  it('按计数降序、同数按 key 字典序、滤零（与后端 _sorted_counts 同规）', () => {
+    const entries = recordEntries({ widget: 5, embedded: 9, standalone: 5, app: 0 })
+    expect(entries).toEqual([
+      { name: 'embedded', value: 9 },
+      { name: 'standalone', value: 5 },
+      { name: 'widget', value: 5 }
+    ])
+  })
+
+  it('空对象/全零 → 空数组（图表走空态）', () => {
+    expect(recordEntries({})).toEqual([])
+    expect(recordEntries({ a: 0 })).toEqual([])
+  })
+})
diff --git a/admin/src/views/stats/overview/charts.ts b/admin/src/views/stats/overview/charts.ts
new file mode 100644
index 0000000..d570674
--- /dev/null
+++ b/admin/src/views/stats/overview/charts.ts
@@ -0,0 +1,379 @@
+/**
+ * 统计分析图表配置（Phase 3 Task 8）
+ *
+ * 纯函数层：StatsResponse（api/stats.ts 类型，形态事实源 app/platform/stats.py）
+ * + 主题档 → EChartsOption；Vue 层只管取数与生命周期（useChart）。
+ * 图表形态与配色方法（dataviz 规范）：
+ * - 漏斗 = 有序量尺（stage 有序）→ 单色相明度阶梯（ordinal ramp），不用多色分类；
+ * - 来源/站点/国家 = 名义类目 → 全部同色（slot 1 单系列），禁止按数值上色；
+ * - 趋势双线 / 意向三片 = 系列即主体 → 分类色固定槽位（色随实体，筛选不重排）；
+ * - 文字一律文字色（标签/数值/图例不用系列色）；网格线实线细线；条形 ≤24px、
+ *   数据端 4px 圆角；饼片间 2px 表面缝隙（borderWidth/surface 色）。
+ * 配色经 validate_palette.js 双模式校验（明度带/色度/CVD 邻对 ΔE/对比度全过）：
+ * - 分类三槽 light #2a78d6/#eb6834/#1baf7a · dark #3987e5/#d95926/#199e70
+ *   （意向饼语义红绿组 green↔red CVD ΔE 4.1 硬伤，弃用改分类槽）；
+ * - 漏斗 ordinal light #1c5cab→#86b6ef · dark #b7d3f6→#184f95（首深末浅/镜像）。
+ */
+import type { EChartsOption } from '@/plugins/echarts'
+import type { StatsFunnel, StatsTrendPoint } from '@/api/stats'
+
+// ---- 主题档（两模式各一套；chrome 色同 dataviz 参考面板） --------------------------
+
+export interface ChartTheme {
+  /** 分类系列槽位（固定序：随实体不随筛选） */
+  series: [string, string, string]
+  /** 名义类目条形统一色（slot 1） */
+  barHue: string
+  /** 漏斗四级明度阶梯（stage 1 → 4） */
+  funnel: [string, string, string, string]
+  /** 图表表面色（饼片缝隙/标记环） */
+  surface: string
+  /** 主文字色（直接标注数值） */
+  ink: string
+  /** 次级文字色（轴标/图例/条端数值） */
+  muted: string
+  /** 网格细实线 */
+  grid: string
+  /** 基线（x 轴线） */
+  axis: string
+  /** tooltip 底色（半透明表面） */
+  tooltipBg: string
+  /** tooltip 文字 */
+  tooltipInk: string
+}
+
+export const CHART_THEME_LIGHT: ChartTheme = {
+  series: ['#2a78d6', '#eb6834', '#1baf7a'],
+  barHue: '#2a78d6',
+  funnel: ['#1c5cab', '#2a78d6', '#5598e7', '#86b6ef'],
+  surface: '#fcfcfb',
+  ink: '#0b0b0b',
+  muted: '#52514e',
+  grid: '#e1e0d9',
+  axis: '#c3c2b7',
+  tooltipBg: 'rgba(255, 255, 255, 0.94)',
+  tooltipInk: '#0b0b0b'
+}
+
+export const CHART_THEME_DARK: ChartTheme = {
+  series: ['#3987e5', '#d95926', '#199e70'],
+  barHue: '#3987e5',
+  funnel: ['#b7d3f6', '#6da7ec', '#2a78d6', '#184f95'],
+  surface: '#1a1a19',
+  ink: '#f0efec',
+  muted: '#c3c2b7',
+  grid: '#2c2c2a',
+  axis: '#383835',
+  tooltipBg: 'rgba(0, 0, 0, 0.8)',
+  tooltipInk: '#f0efec'
+}
+
+export function chartTheme(dark: boolean): ChartTheme {
+  return dark ? CHART_THEME_DARK : CHART_THEME_LIGHT
+}
+
+/** tooltip 公共样式（item/axis 触发） */
+function tooltipStyle(theme: ChartTheme, trigger: 'item' | 'axis') {
+  return {
+    trigger,
+    backgroundColor: theme.tooltipBg,
+    borderColor: theme.axis,
+    borderWidth: 1,
+    textStyle: { color: theme.tooltipInk, fontSize: 12 },
+    ...(trigger === 'item' ? {} : { axisPointer: { type: 'line' as const } })
+  }
+}
+
+// ---- 趋势：按日补零 ----------------------------------------------------------------
+
+/** Date → UTC 日期串（date-only 串的加减日用 UTC，避免本地时区漂移） */
+function utcKey(date: Date): string {
+  return date.toISOString().slice(0, 10)
+}
+
+/**
+ * 趋势补零（stats.py 口径：无数据的日期不产出行，前端补零）
+ *
+ * from/to 缺失或非法时回退数据自身 min/max 日期；趋势原始为空 → 原样返回
+ * （空数据态由图表层处理）。输出按日升序，缺口日 {0,0}。
+ */
+export function fillTrendDates(
+  trend: StatsTrendPoint[],
+  from?: string,
+  to?: string
+): StatsTrendPoint[] {
+  if (trend.length === 0) return trend
+  const dates = trend.map((p) => p.date).sort()
+  const hasBounds = !!from && !!to && /^\d{4}-\d{2}-\d{2}$/.test(from) && /^\d{4}-\d{2}-\d{2}$/.test(to) && from! <= to!
+  const start = hasBounds ? from! : dates[0]
+  const end = hasBounds ? to! : dates[dates.length - 1]
+  const byDate = new Map(trend.map((p) => [p.date, p]))
+  const out: StatsTrendPoint[] = []
+  for (let cur = new Date(`${start}T00:00:00Z`); utcKey(cur) <= end; cur.setUTCDate(cur.getUTCDate() + 1)) {
+    const key = utcKey(cur)
+    const point = byDate.get(key)
+    out.push({ date: key, conversations: point?.conversations ?? 0, leads: point?.leads ?? 0 })
+  }
+  return out
+}
+
+/** 趋势双线（会话 slot 1 / 线索 slot 2；x 轴显 MM-DD，tooltip 显全日期） */
+export function buildTrendOption(points: StatsTrendPoint[], theme: ChartTheme): EChartsOption {
+  return {
+    legend: {
+      bottom: 0,
+      icon: 'roundRect',
+      itemWidth: 12,
+      itemHeight: 12,
+      itemGap: 20,
+      textStyle: { color: theme.muted, fontSize: 12 }
+    },
+    grid: { top: 16, right: 16, bottom: 40, left: 8, containLabel: true },
+    tooltip: tooltipStyle(theme, 'axis'),
+    xAxis: {
+      type: 'category',
+      boundaryGap: false,
+      data: points.map((p) => p.date),
+      axisLine: { lineStyle: { color: theme.axis, width: 1 } },
+      axisTick: { show: false },
+      axisLabel: {
+        color: theme.muted,
+        fontSize: 12,
+        hideOverlap: true,
+        formatter: (value: string) => value.slice(5) // MM-DD（年份进 tooltip）
+      }
+    },
+    yAxis: {
+      type: 'value',
+      minInterval: 1, // 计数轴取整
+      axisLine: { show: false },
+      axisTick: { show: false },
+      axisLabel: { color: theme.muted, fontSize: 12 },
+      splitLine: { show: true, lineStyle: { color: theme.grid, width: 1, type: 'solid' } }
+    },
+    series: [
+      {
+        name: '会话',
+        type: 'line',
+        data: points.map((p) => p.conversations),
+        color: theme.series[0],
+        lineStyle: { width: 2 },
+        symbol: 'circle',
+        symbolSize: 8,
+        showSymbol: false
+      },
+      {
+        name: '线索',
+        type: 'line',
+        data: points.map((p) => p.leads),
+        color: theme.series[1],
+        lineStyle: { width: 2 },
+        symbol: 'circle',
+        symbolSize: 8,
+        showSymbol: false
+      }
+    ]
+  }
+}
+
+// ---- 漏斗：横向条形模拟（有序色阶） --------------------------------------------------
+
+const FUNNEL_STAGES: Array<{ key: keyof StatsFunnel; label: string }> = [
+  { key: 'conversations', label: '会话' },
+  { key: 'leads', label: '留资' },
+  { key: 'evaluated', label: '评估完成' },
+  { key: 'push_succeeded', label: '推送成功' }
+]
+
+/**
+ * 漏斗横向条形：宽度按会话数归一（x 轴 max=会话数），逐级标注
+ * 「数量 · 占上一级 %」（首级无转化率；上级 0 时只标数量）。
+ */
+export function buildFunnelOption(funnel: StatsFunnel, theme: ChartTheme): EChartsOption {
+  const counts = FUNNEL_STAGES.map((stage) => funnel[stage.key])
+  // y 类目轴 index 0 在底部 → 倒序录入使「会话」在顶
+  const labels = FUNNEL_STAGES.map((stage, index) => {
+    const count = counts[index]
+    if (index === 0) return String(count)
+    const prev = counts[index - 1]
+    if (prev <= 0) return String(count)
+    return `${count} · ${Math.round((count / prev) * 100)}%`
+  }).reverse()
+  return {
+    grid: { top: 8, right: 16, bottom: 8, left: 8, containLabel: true },
+    tooltip: {
+      ...tooltipStyle(theme, 'item'),
+      formatter: (params) => {
+        const point = Array.isArray(params) ? params[0] : params
+        const stageIndex = FUNNEL_STAGES.length - 1 - (point?.dataIndex ?? 0) // 还原正序
+        const stage = FUNNEL_STAGES[stageIndex]
+        const count = counts[stageIndex]
+        const base = counts[0]
+        const overall = base > 0 ? ` · 整体转化 ${Math.round((count / base) * 100)}%` : ''
+        return `${stage.label}：${count}${overall}`
+      }
+    },
+    xAxis: {
+      type: 'value',
+      max: counts[0], // 各级宽度同比于会话数（漏斗比例语义）
+      axisLine: { show: false },
+      axisTick: { show: false },
+      axisLabel: { show: false },
+      splitLine: { show: false }
+    },
+    yAxis: {
+      type: 'category',
+      data: FUNNEL_STAGES.map((stage) => stage.label).reverse(),
+      axisLine: { show: false },
+      axisTick: { show: false },
+      axisLabel: { color: theme.muted, fontSize: 12 }
+    },
+    series: [
+      {
+        type: 'bar',
+        barWidth: 22,
+        data: counts
+          .map((value, index) => ({
+            value,
+            itemStyle: { color: theme.funnel[index], borderRadius: [0, 4, 4, 0] }
+          }))
+          .reverse(),
+        label: {
+          show: true,
+          position: 'right',
+          color: theme.muted,
+          fontSize: 12,
+          formatter: (params: { dataIndex: number }) => labels[params.dataIndex]
+        }
+      }
+    ]
+  }
+}
+
+// ---- 意向分布：环形图（分类三槽固定指派） ----------------------------------------------
+
+/** 意向键固定序（色随实体：interested=slot1 / not_interested=slot2 / pending=slot3） */
+export const INTENT_PIE_ORDER: Array<{ key: string; label: string }> = [
+  { key: 'interested', label: '有意向' },
+  { key: 'not_interested', label: '无意向' },
+  { key: 'pending', label: '待定' }
+]
+
+/** 意向分布条目（过滤零值，保固定序；后端枚举三键，未知键不展示） */
+export interface IntentEntry {
+  name: string
+  value: number
+  /** 固定色槽位（interested=0 / not_interested=1 / pending=2——色随实体不随筛选） */
+  slot: number
+}
+
+export function intentEntries(intent: Record<string, number>): IntentEntry[] {
+  return INTENT_PIE_ORDER.map((item, slot) => ({
+    name: item.label,
+    value: intent[item.key] ?? 0,
+    slot
+  })).filter((entry) => entry.value > 0)
+}
+
+/** 意向环形图：外标 name 数值（占比），图例兜底识别；片间 2px 表面缝隙 */
+export function buildIntentPieOption(entries: IntentEntry[], theme: ChartTheme): EChartsOption {
+  const total = entries.reduce((sum, item) => sum + item.value, 0)
+  return {
+    title: {
+      text: String(total),
+      subtext: '总评估',
+      left: 'center',
+      top: '38%',
+      textStyle: { color: theme.ink, fontSize: 22, fontWeight: 600 },
+      subtextStyle: { color: theme.muted, fontSize: 12 }
+    },
+    legend: {
+      bottom: 0,
+      icon: 'roundRect',
+      itemWidth: 12,
+      itemHeight: 12,
+      itemGap: 20,
+      textStyle: { color: theme.muted, fontSize: 12 }
+    },
+    tooltip: tooltipStyle(theme, 'item'),
+    series: [
+      {
+        type: 'pie',
+        radius: ['50%', '72%'],
+        center: ['50%', '44%'],
+        data: entries.map((entry) => ({
+          name: entry.name,
+          value: entry.value,
+          itemStyle: { color: theme.series[entry.slot] }
+        })),
+        itemStyle: { borderWidth: 2, borderColor: theme.surface },
+        label: {
+          color: theme.muted,
+          fontSize: 12,
+          formatter: '{b} {c}（{d}%）'
+        },
+        labelLine: { length: 10, length2: 12, lineStyle: { color: theme.axis } }
+      }
+    ]
+  }
+}
+
+// ---- 名义类目横向条形（来源/站点/国家） ----------------------------------------------
+
+export interface BarEntry {
+  name: string
+  value: number
+}
+
+/**
+ * 名义类目横向条形（统一 slot 1 单色——类目无序，不按数值上色）
+ *
+ * entries 需预排序（多→少）与截断；调用方负责 name 展示文案（如来源枚举中文化）。
+ */
+export function buildBarOption(entries: BarEntry[], theme: ChartTheme): EChartsOption {
+  return {
+    grid: { top: 8, right: 48, bottom: 8, left: 8, containLabel: true },
+    tooltip: tooltipStyle(theme, 'item'),
+    xAxis: {
+      type: 'value',
+      minInterval: 1,
+      axisLine: { show: false },
+      axisTick: { show: false },
+      axisLabel: { show: false },
+      splitLine: { show: false }
+    },
+    yAxis: {
+      type: 'category',
+      data: entries.map((entry) => entry.name).reverse(),
+      axisLine: { show: false },
+      axisTick: { show: false },
+      axisLabel: {
+        color: theme.muted,
+        fontSize: 12,
+        width: 130,
+        overflow: 'truncate'
+      }
+    },
+    series: [
+      {
+        type: 'bar',
+        barWidth: 16,
+        data: entries.map((entry) => ({
+          ...entry,
+          itemStyle: { color: theme.barHue, borderRadius: [0, 4, 4, 0] }
+        })),
+        label: { show: true, position: 'right', color: theme.muted, fontSize: 12 }
+      }
+    ]
+  }
+}
+
+// ---- 计数表降序工具（source/site 的 Record 形态 → BarEntry[]） -----------------------
+
+/** 计数 Record → 降序条目（value>0；同数按 key 字典序，与后端 _sorted_counts 同规） */
+export function recordEntries(record: Record<string, number>): BarEntry[] {
+  return Object.entries(record)
+    .filter(([, value]) => value > 0)
+    .sort((a, b) => b[1] - a[1] || (a[0] < b[0] ? -1 : 1))
+    .map(([name, value]) => ({ name, value }))
+}
diff --git a/admin/src/views/stats/overview/index.vue b/admin/src/views/stats/overview/index.vue
index 01ede20..a629f44 100644
--- a/admin/src/views/stats/overview/index.vue
+++ b/admin/src/views/stats/overview/index.vue
@@ -1,25 +1,592 @@
-<!-- 统计分析（骨架占位页） -->
+<!--
+  统计分析（Phase 3 Task 8）
+  - 指标卡四张（口径文案沿用仪表盘 caption——事实源 app/platform/stats.py 口径表）
+  - 漏斗：会话 → 留资 → 评估完成 → 推送成功（横向条形模拟，有序单色明度阶梯）
+  - 趋势：按日会话/线索双线（后端无数据日期不产出行，前端按窗口补零）
+  - 分布：意向（环形）/ 来源（条形）/ 站点（条形）/ 国家 Top10（横向条形）
+  - 推送健康表：四状态计数 + duplicated（success 的 outcome 子集，非错误）
+  - 筛选：时间档（今天/近7天/近30天/自定义区间）+ 租户切换（超管，含"全部"
+    合并选项；租户管理员固定自己）——一行筛选作用于全部图表
+  - 图表配色/形态见 ./charts.ts 头注（validate_palette.js 双模式校验通过）
+-->
 <template>
-  <div class="page-placeholder">
-    <ElCard shadow="never">
+  <div class="stats-page">
+    <!-- 头部：标题 + 筛选行（一行筛选作用域覆盖下方全部图表与卡片） -->
+    <div class="page-header">
+      <div>
+        <h2 class="page-title">统计分析</h2>
+        <p class="page-sub">转化漏斗、按日趋势与分布（指标口径与仪表盘一致）</p>
+      </div>
+      <div class="filter-bar">
+        <ElRadioGroup v-model="rangeFilter">
+          <ElRadioButton
+            v-for="item in STATS_RANGE_OPTIONS"
+            :key="item.value"
+            :value="item.value"
+          >
+            {{ item.label }}
+          </ElRadioButton>
+        </ElRadioGroup>
+        <ElDatePicker
+          v-model="customRange"
+          type="daterange"
+          value-format="YYYY-MM-DD"
+          range-separator="至"
+          start-placeholder="开始日期"
+          end-placeholder="结束日期"
+          :clearable="false"
+          :disabled="rangeFilter !== 'custom'"
+          class="filter-date"
+        />
+        <ElSelect
+          v-if="isSuper"
+          v-model="tenantFilter"
+          :loading="tenantsLoading"
+          placeholder="租户"
+          class="tenant-switcher"
+        >
+          <ElOption value="" label="全部租户（合并）" />
+          <ElOption
+            v-for="tenant in tenants"
+            :key="tenant.slug"
+            :value="tenant.slug"
+            :label="`${tenant.name}（@${tenant.slug}）${tenant.status === 'disabled' ? ' · 停用' : ''}`"
+          />
+        </ElSelect>
+        <ElTag v-else-if="authStore.tenantSlug" type="info" size="large">
+          租户：{{ authStore.tenantSlug }}
+        </ElTag>
+      </div>
+    </div>
+
+    <!-- 自定义区间不完整提示（未选全不发请求，保留上一份数据） -->
+    <ElAlert
+      v-if="params === null"
+      type="info"
+      :closable="false"
+      title="自定义区间未选完整——补全起止日期后自动查询"
+      class="section-alert"
+    />
+    <!-- 超管租户枚举失败（合并统计不受影响，仅切换器不可用） -->
+    <ElAlert
+      v-if="isSuper && tenantsError"
+      type="warning"
+      :closable="false"
+      :title="`租户列表加载失败（不影响合并统计）：${tenantsError}`"
+      class="section-alert"
+    >
+      <ElButton size="small" :loading="tenantsLoading" @click="loadTenants">重试</ElButton>
+    </ElAlert>
+
+    <!-- 指标卡行 -->
+    <ElCard shadow="never" class="section-card">
+      <ElAlert v-if="statsError" type="error" :closable="false" :title="statsError">
+        <ElButton size="small" :loading="statsLoading" @click="reload">重试</ElButton>
+      </ElAlert>
+      <div v-else v-loading="statsLoading" class="stat-grid">
+        <div v-for="tile in overviewTiles" :key="tile.label" class="stat-tile">
+          <p class="stat-label">{{ tile.label }}</p>
+          <p class="stat-value">{{ tile.value }}</p>
+          <p class="stat-caption">{{ tile.caption }}</p>
+        </div>
+      </div>
+    </ElCard>
+
+    <!-- 漏斗 + 趋势 -->
+    <ElCard shadow="never" class="section-card">
       <template #header>
-        <span class="card-title">统计分析</span>
+        <div class="card-header">
+          <span class="card-title">转化漏斗</span>
+          <span class="card-sub">会话 → 留资 → 评估完成 → 推送成功 · 数值标注「数量 · 占上一级 %」</span>
+        </div>
       </template>
-      <ElEmpty description="卡片 / 漏斗 / 趋势 / 分布与推送健康（后续任务实现）" />
+      <div ref="funnelRef" v-loading="statsLoading" class="chart chart-funnel" />
+    </ElCard>
+
+    <ElCard shadow="never" class="section-card">
+      <template #header>
+        <div class="card-header">
+          <span class="card-title">按日趋势</span>
+          <span class="card-sub">会话 / 线索双线 · 北京日界分组 · 窗口内无数据日期补零</span>
+        </div>
+      </template>
+      <div ref="trendRef" v-loading="statsLoading" class="chart chart-trend" />
+    </ElCard>
+
+    <!-- 分布四联 -->
+    <div class="dist-grid">
+      <ElCard shadow="never" class="section-card">
+        <template #header>
+          <div class="card-header">
+            <span class="card-title">意向分布</span>
+            <span class="card-sub">评估意向三级</span>
+          </div>
+        </template>
+        <div ref="intentRef" v-loading="statsLoading" class="chart chart-pie" />
+      </ElCard>
+
+      <ElCard shadow="never" class="section-card">
+        <template #header>
+          <div class="card-header">
+            <span class="card-title">来源分布</span>
+            <span class="card-sub">{{ distCaption(sourceAll.length, '来源') }}</span>
+          </div>
+        </template>
+        <div ref="sourceRef" v-loading="statsLoading" class="chart chart-bar" />
+      </ElCard>
+
+      <ElCard shadow="never" class="section-card">
+        <template #header>
+          <div class="card-header">
+            <span class="card-title">站点分布</span>
+            <span class="card-sub">{{ distCaption(siteAll.length, '站点') }}</span>
+          </div>
+        </template>
+        <div ref="siteRef" v-loading="statsLoading" class="chart chart-bar" />
+      </ElCard>
+
+      <ElCard shadow="never" class="section-card">
+        <template #header>
+          <div class="card-header">
+            <span class="card-title">国家 Top10</span>
+            <span class="card-sub">会话 IP 归国（iptocc）</span>
+          </div>
+        </template>
+        <div ref="countryRef" v-loading="statsLoading" class="chart chart-country" />
+      </ElCard>
+    </div>
+
+    <!-- 推送健康 -->
+    <ElCard shadow="never" class="section-card">
+      <template #header>
+        <div class="card-header">
+          <span class="card-title">推送健康</span>
+          <span class="card-sub">
+            按推送日志时间窗计数 · skipped（预检不满足必拒）与 pending 不进成功率分母 ·
+            duplicated 为 success 的 outcome 子集（200 但对方判重，非错误）
+          </span>
+        </div>
+      </template>
+      <ElTable :data="healthRows" v-loading="statsLoading">
+        <ElTableColumn label="状态" width="140">
+          <template #default="{ row }">
+            <ElTag :type="row.tag" size="small">{{ row.label }}</ElTag>
+          </template>
+        </ElTableColumn>
+        <ElTableColumn label="计数" width="100" align="right">
+          <template #default="{ row }">
+            <span class="mono">{{ row.count }}</span>
+          </template>
+        </ElTableColumn>
+        <ElTableColumn label="占比（四状态）" width="130" align="right">
+          <template #default="{ row }">
+            <span class="mono">{{ row.pct }}</span>
+          </template>
+        </ElTableColumn>
+        <ElTableColumn label="说明" min-width="280">
+          <template #default="{ row }">
+            <span class="note">{{ row.note }}</span>
+          </template>
+        </ElTableColumn>
+      </ElTable>
     </ElCard>
   </div>
 </template>
 
 <script setup lang="ts">
+  import { useChart } from '@/hooks'
+  import type { EChartsOption } from '@/plugins/echarts'
+  import { useAuthStore } from '@/store/modules/auth'
+  import { fetchPlatformStats, fetchTenantStats, type StatsResponse } from '@/api/stats'
+  import { fetchTenantList, type TenantListItem } from '@/api/tenants'
+  import { conversationSourceLabel } from '@/api/conversations'
+  import { STATS_RANGE_OPTIONS, resolveStatsRange, type StatsRangeFilter } from '@/utils/statsRange'
+  import {
+    buildBarOption,
+    buildFunnelOption,
+    buildIntentPieOption,
+    buildTrendOption,
+    chartTheme,
+    fillTrendDates,
+    intentEntries,
+    recordEntries
+  } from './charts'
+
   defineOptions({ name: 'StatsOverview' })
+
+  const authStore = useAuthStore()
+  const isSuper = computed(() => authStore.role === 'super')
+
+  // ---- 筛选：时间档 + 自定义区间 + 租户（超管） --------------------------------------
+
+  const rangeFilter = ref<StatsRangeFilter>('last30')
+  const customRange = ref<[string, string] | null>(null)
+  /** 当前筛选 → 查询参数；null = 自定义区间不完整（不发请求，保留上一份数据） */
+  const params = computed(() => resolveStatsRange(rangeFilter.value, customRange.value))
+
+  const tenantFilter = ref('') // '' = 全部租户合并视图
+  const tenants = ref<TenantListItem[]>([])
+  const tenantsLoading = ref(false)
+  const tenantsError = ref('')
+
+  async function loadTenants(): Promise<void> {
+    tenantsLoading.value = true
+    tenantsError.value = ''
+    try {
+      tenants.value = (await fetchTenantList()).items
+    } catch (error) {
+      tenantsError.value = error instanceof Error ? error.message : '租户列表加载失败'
+    } finally {
+      tenantsLoading.value = false
+    }
+  }
+
+  // ---- 统计取数（epoch 防筛选快速切换的过期响应竞写） --------------------------------
+
+  const stats = ref<StatsResponse | null>(null)
+  const statsLoading = ref(false)
+  const statsError = ref('')
+  const statsEpoch = ref(0)
+
+  async function reload(): Promise<void> {
+    const bounds = params.value
+    if (!bounds) return // 自定义区间不完整：不发请求
+    const epoch = ++statsEpoch.value
+    statsLoading.value = true
+    statsError.value = ''
+    try {
+      const res = isSuper.value
+        ? await fetchPlatformStats(
+            tenantFilter.value ? { tenant: tenantFilter.value, ...bounds } : bounds
+          )
+        : await fetchTenantStats(authStore.tenantSlug as string, bounds)
+      if (epoch !== statsEpoch.value) return
+      stats.value = res
+    } catch (error) {
+      if (epoch !== statsEpoch.value) return
+      stats.value = null
+      statsError.value = error instanceof Error ? error.message : '统计加载失败'
+    } finally {
+      if (epoch === statsEpoch.value) statsLoading.value = false
+    }
+  }
+
+  // ---- 图表（useChart 实例 × 6；数据/主题变化统一重绘） ------------------------------
+
+  const funnelChart = useChart()
+  const trendChart = useChart()
+  const intentChart = useChart()
+  const sourceChart = useChart()
+  const siteChart = useChart()
+  const countryChart = useChart()
+  const { chartRef: funnelRef } = funnelChart
+  const { chartRef: trendRef } = trendChart
+  const { chartRef: intentRef } = intentChart
+  const { chartRef: sourceRef } = sourceChart
+  const { chartRef: siteRef } = siteChart
+  const { chartRef: countryRef } = countryChart
+  const { isDark } = trendChart
+
+  /** 重绘单图：有数据先 clear 再 setOption（类目数变化不残留旧轴），空数据走空态 */
+  function render(
+    chart: ReturnType<typeof useChart>,
+    option: EChartsOption,
+    empty: boolean
+  ): void {
+    if (!empty) chart.getChartInstance()?.clear()
+    chart.initChart(option, empty)
+  }
+
+  /** 名义类目条目截断上限（Top10；超出在卡片 sub 标注总数） */
+  const BAR_TOP_N = 10
+
+  const trendPoints = computed(() =>
+    stats.value
+      ? fillTrendDates(stats.value.trend, params.value?.from, params.value?.to)
+      : []
+  )
+  const intentData = computed(() => intentEntries(stats.value?.distributions.intent ?? {}))
+  const sourceAll = computed(() =>
+    recordEntries(stats.value?.distributions.source ?? {}).map((entry) => ({
+      name: conversationSourceLabel(entry.name),
+      value: entry.value
+    }))
+  )
+  const siteAll = computed(() => recordEntries(stats.value?.distributions.site ?? {}))
+  const countryData = computed(() =>
+    (stats.value?.distributions.country ?? []).map((item) => ({
+      name: item.country,
+      value: item.count
+    }))
+  )
+
+  function distCaption(total: number, noun: string): string {
+    return total > BAR_TOP_N ? `共 ${total} ${noun}，显示前 ${BAR_TOP_N}` : `按会话数排序`
+  }
+
+  function renderCharts(): void {
+    const theme = chartTheme(isDark.value)
+    const s = stats.value
+    render(
+      funnelChart,
+      s ? buildFunnelOption(s.funnel, theme) : {},
+      !s || s.funnel.conversations === 0
+    )
+    render(trendChart, buildTrendOption(trendPoints.value, theme), trendPoints.value.length === 0)
+    render(intentChart, buildIntentPieOption(intentData.value, theme), intentData.value.length === 0)
+    render(
+      sourceChart,
+      buildBarOption(sourceAll.value.slice(0, BAR_TOP_N), theme),
+      sourceAll.value.length === 0
+    )
+    render(
+      siteChart,
+      buildBarOption(siteAll.value.slice(0, BAR_TOP_N), theme),
+      siteAll.value.length === 0
+    )
+    render(countryChart, buildBarOption(countryData.value, theme), countryData.value.length === 0)
+  }
+
+  // ---- 指标卡（口径文案沿用仪表盘 caption） ------------------------------------------
+
+  /** 推送成功率展示：null（分母 0）→ "—"；其余 → 百分比（整 % 去小数位） */
+  function formatRate(rate: number | null | undefined): string {
+    if (rate === null || rate === undefined) return '—'
+    return `${(rate * 100).toFixed(1).replace(/\.0$/, '')}%`
+  }
+
+  const overviewTiles = computed(() => {
+    const cards = stats.value?.cards
+    return [
+      {
+        label: '会话',
+        value: cards ? String(cards.conversations) : '—',
+        caption: '发生的会话，不要求有消息'
+      },
+      {
+        label: '线索',
+        value: cards ? String(cards.leads) : '—',
+        caption: '留资三选一：电话 / WhatsApp / 邮箱任一非空'
+      },
+      {
+        label: '高意向',
+        value: cards ? String(cards.high_intent) : '—',
+        caption: '评估为「有意向」的会话'
+      },
+      {
+        label: '推送成功率',
+        value: cards ? formatRate(cards.push_success_rate) : '—',
+        caption: '成功 / (成功 + 失败)；无终态推送显示 —'
+      }
+    ]
+  })
+
+  // ---- 推送健康表（四状态 + duplicated 子集行） --------------------------------------
+
+  const healthRows = computed(() => {
+    const h = stats.value?.push_health
+    const total = h ? h.pending + h.success + h.failed + h.skipped : 0
+    const pct = (count: number) =>
+      total > 0 ? `${Math.round((count / total) * 100)}%` : '—'
+    const value = (key: 'pending' | 'success' | 'failed' | 'skipped' | 'duplicated') =>
+      h ? h[key] : 0
+    return [
+      {
+        key: 'pending',
+        label: '待推送',
+        tag: 'warning' as const,
+        count: value('pending'),
+        pct: pct(value('pending')),
+        note: '已入队尚未到终态（重试中等）'
+      },
+      {
+        key: 'success',
+        label: '成功',
+        tag: 'success' as const,
+        count: value('success'),
+        pct: pct(value('success')),
+        note: '推送 200 且对方接受（含判重）'
+      },
+      {
+        key: 'failed',
+        label: '失败',
+        tag: 'danger' as const,
+        count: value('failed'),
+        pct: pct(value('failed')),
+        note: '重试耗尽或不可达'
+      },
+      {
+        key: 'skipped',
+        label: '跳过',
+        tag: 'info' as const,
+        count: value('skipped'),
+        pct: pct(value('skipped')),
+        note: '推送预检不满足（无联系方式/未启用推送），必拒不入成功率分母'
+      },
+      {
+        key: 'duplicated',
+        label: '重复（判重）',
+        tag: 'info' as const,
+        count: value('duplicated'),
+        pct: '—',
+        note: 'success 的 outcome 子集：200 但对方判为重复，不是错误'
+      }
+    ]
+  })
+
+  // ---- 装配 -------------------------------------------------------------------------
+
+  watch([stats, isDark], () => nextTick(renderCharts))
+  watch([rangeFilter, customRange, tenantFilter], reload)
+
+  onMounted(() => {
+    renderCharts() // 先出空态骨架，取数完成后 watch 触发重绘
+    if (isSuper.value) loadTenants()
+    if (!isSuper.value && !authStore.tenantSlug) return // 防御：无租户标识不发请求
+    reload()
+  })
 </script>
 
 <style scoped lang="scss">
-  .page-placeholder {
+  .stats-page {
+    display: flex;
+    flex-direction: column;
+    gap: 16px;
     padding: 16px;
   }
 
-  .card-title {
-    font-weight: 600;
+  .page-header {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 16px;
+    align-items: flex-end;
+    justify-content: space-between;
+
+    .page-title {
+      margin: 0;
+      font-size: 20px;
+      font-weight: 600;
+    }
+
+    .page-sub {
+      margin: 4px 0 0;
+      font-size: 13px;
+      color: var(--art-gray-500);
+    }
+  }
+
+  .filter-bar {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 12px;
+    align-items: center;
+
+    .filter-date {
+      width: 260px;
+    }
+
+    .tenant-switcher {
+      width: 240px;
+    }
+  }
+
+  .section-alert {
+    :deep(.el-alert__content) {
+      display: flex;
+      align-items: center;
+    }
+  }
+
+  .section-card {
+    .card-header {
+      display: flex;
+      flex-wrap: wrap;
+      gap: 4px 12px;
+      align-items: baseline;
+      justify-content: space-between;
+    }
+
+    .card-title {
+      font-weight: 600;
+    }
+
+    .card-sub {
+      font-size: 12px;
+      color: var(--art-gray-500);
+    }
+  }
+
+  // ---- 指标卡行 ---------------------------------------------------------------
+
+  .stat-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+    gap: 12px;
+    min-height: 90px;
+  }
+
+  .stat-tile {
+    padding: 16px;
+    border: 1px solid var(--art-card-border);
+    border-radius: 8px;
+
+    .stat-label {
+      margin: 0;
+      font-size: 13px;
+      color: var(--art-gray-500);
+    }
+
+    .stat-value {
+      margin: 8px 0;
+      font-size: 28px;
+      font-weight: 600;
+    }
+
+    .stat-caption {
+      margin: 0;
+      font-size: 12px;
+      color: var(--art-gray-400);
+    }
+  }
+
+  // ---- 图表（固定高度含轴标带——ECharts 容器常见坑） ------------------------------
+
+  .chart {
+    width: 100%;
+  }
+
+  .chart-funnel {
+    height: 280px;
+  }
+
+  .chart-trend {
+    height: 320px;
+  }
+
+  .chart-pie {
+    height: 300px;
+  }
+
+  .chart-bar {
+    height: 300px;
+  }
+
+  .chart-country {
+    height: 360px;
+  }
+
+  .dist-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
+    gap: 16px;
+  }
+
+  .mono {
+    font-variant-numeric: tabular-nums;
+  }
+
+  .note {
+    font-size: 13px;
+    color: var(--art-gray-500);
   }
 </style>
diff --git a/app/platform/stats.py b/app/platform/stats.py
index 254e927..47690f8 100644
--- a/app/platform/stats.py
+++ b/app/platform/stats.py
@@ -271,5 +271,5 @@ def merge_stats(parts: list[dict]) -> dict:
         "site": _sorted_counts(site),
         "country": [
             {"country": name, "count": count}
-            for name, count in country.most_common(COUNTRY_TOP_N)]},
+            for name, count in country.most_common(COUNTRY_TOP_N)]}
     return out
diff --git a/tests/test_stats.py b/tests/test_stats.py
index 110ee75..7c858ce 100644
--- a/tests/test_stats.py
+++ b/tests/test_stats.py
@@ -374,6 +374,10 @@ def test_cross_tenant_super_view(super_client, tmp_path):
         {"date": "2026-01-05", "conversations": 1, "leads": 1},
         {"date": "2026-01-06", "conversations": 2, "leads": 1},
     ]
+    # 回归钉子: merge_stats 的 distributions 必须是对象(曾因赋值行尾随逗号
+    # 变 1 元组序列化成 JSON 数组,单租户路径不受累——Phase 3 Task 8 冒烟发现)
+    assert body["distributions"]["intent"] == {
+        "interested": 1, "not_interested": 1, "pending": 0}
     assert body["push_health"]["success"] == 1
     assert not (tmp_path / "tenants" / "jcc.db").exists()  # 未为统计建空库