feat: add analytics page with time-series charts to manage panel

app/(manage)/manage/analytics/page.tsx

@@ -0,0 +1,10 @@
+import type { Metadata } from "next"
+import { AnalyticsClient } from "@/components/manage/analytics-client"
+
+export const metadata: Metadata = {
+  title: "Analytics",
+}
+
+export default function AnalyticsPage() {
+  return <AnalyticsClient />
+}

components/manage/analytics-client.tsx

@@ -0,0 +1,120 @@
+"use client"
+
+import { useState, useEffect } from "react"
+import { TrendingUp, Users, Monitor, Tag } from "lucide-react"
+import ReactEChartsCore from "echarts-for-react/lib/core"
+import * as echarts from "echarts/core"
+import { LineChart, BarChart } from "echarts/charts"
+import {
+  GridComponent,
+  TooltipComponent,
+  LegendComponent,
+} from "echarts/components"
+import { CanvasRenderer } from "echarts/renderers"
+
+echarts.use([LineChart, BarChart, GridComponent, TooltipComponent, LegendComponent, CanvasRenderer])
+
+interface AnalyticsData {
+  benchmarkTimeline: Array<{ day: string; count: number }>
+  userTimeline: Array<{ day: string; count: number }>
+  deviceDistribution: Array<{ hardwareSlug: string; hardwareName: string; count: number }>
+  genrePopularity: Array<{ genre: string; count: number }>
+  commentTimeline: Array<{ day: string; count: number }>
+}
+
+export function AnalyticsClient() {
+  const [data, setData] = useState<AnalyticsData | null>(null)
+  const [loading, setLoading] = useState(true)
+
+  useEffect(() => {
+    fetch("/api/admin/analytics/overview")
+      .then((res) => res.json())
+      .then((d) => { setData(d); setLoading(false) })
+      .catch(() => setLoading(false))
+  }, [])
+
+  if (loading) {
+    return <div className="animate-pulse h-96 rounded-lg bg-zinc-800" />
+  }
+
+  if (!data) {
+    return <div className="text-center py-12 text-text/50">Failed to load analytics</div>
+  }
+
+  const benchmarkOption = {
+    tooltip: { trigger: "axis" as const },
+    xAxis: { type: "category" as const, data: data.benchmarkTimeline.map((d) => d.day), axisLabel: { fontSize: 10 } },
+    yAxis: { type: "value" as const },
+    series: [{ name: "Benchmarks", type: "line", data: data.benchmarkTimeline.map((d) => d.count), smooth: true, itemStyle: { color: "#eb3779" } }],
+    grid: { left: 40, right: 16, top: 16, bottom: 24 },
+  }
+
+  const userOption = {
+    tooltip: { trigger: "axis" as const },
+    xAxis: { type: "category" as const, data: data.userTimeline.map((d) => d.day), axisLabel: { fontSize: 10 } },
+    yAxis: { type: "value" as const },
+    series: [{ name: "Registrations", type: "line", data: data.userTimeline.map((d) => d.count), smooth: true, itemStyle: { color: "#a78bfa" }, areaStyle: { color: "rgba(167,139,250,0.1)" } }],
+    grid: { left: 40, right: 16, top: 16, bottom: 24 },
+  }
+
+  const deviceOption = {
+    tooltip: { trigger: "axis" as const },
+    xAxis: { type: "category" as const, data: data.deviceDistribution.map((d) => d.hardwareName), axisLabel: { fontSize: 10 } },
+    yAxis: { type: "value" as const },
+    series: [{ name: "Benchmarks", type: "bar", data: data.deviceDistribution.map((d) => d.count), itemStyle: { color: "#fb793c" } }],
+    grid: { left: 40, right: 16, top: 16, bottom: 24 },
+  }
+
+  const genreOption = {
+    tooltip: { trigger: "axis" as const },
+    xAxis: { type: "category" as const, data: data.genrePopularity.map((d) => d.genre), axisLabel: { fontSize: 10, rotate: 30 } },
+    yAxis: { type: "value" as const },
+    series: [{ name: "Benchmarks", type: "bar", data: data.genrePopularity.map((d) => d.count), itemStyle: { color: "#22c55e" } }],
+    grid: { left: 40, right: 16, top: 16, bottom: 60 },
+  }
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h2 className="text-lg font-semibold">Analytics</h2>
+        <p className="text-sm text-zinc-400">90-day trends and distributions</p>
+      </div>
+
+      {/* Benchmark Submissions Over Time */}
+      <div className="rounded-lg border border-zinc-800 bg-zinc-900 p-4">
+        <div className="flex items-center gap-2 mb-3">
+          <TrendingUp className="h-4 w-4 text-primary" />
+          <h3 className="text-sm font-semibold">Benchmark Submissions (90d)</h3>
+        </div>
+        <ReactEChartsCore echarts={echarts} option={benchmarkOption} style={{ height: 240 }} />
+      </div>
+
+      {/* User Registrations Over Time */}
+      <div className="rounded-lg border border-zinc-800 bg-zinc-900 p-4">
+        <div className="flex items-center gap-2 mb-3">
+          <Users className="h-4 w-4 text-purple-400" />
+          <h3 className="text-sm font-semibold">User Registrations (90d)</h3>
+        </div>
+        <ReactEChartsCore echarts={echarts} option={userOption} style={{ height: 240 }} />
+      </div>
+
+      {/* Device Distribution + Genre Popularity (side by side) */}
+      <div className="grid gap-6 md:grid-cols-2">
+        <div className="rounded-lg border border-zinc-800 bg-zinc-900 p-4">
+          <div className="flex items-center gap-2 mb-3">
+            <Monitor className="h-4 w-4 text-accent" />
+            <h3 className="text-sm font-semibold">Device Distribution</h3>
+          </div>
+          <ReactEChartsCore echarts={echarts} option={deviceOption} style={{ height: 240 }} />
+        </div>
+        <div className="rounded-lg border border-zinc-800 bg-zinc-900 p-4">
+          <div className="flex items-center gap-2 mb-3">
+            <Tag className="h-4 w-4 text-green-400" />
+            <h3 className="text-sm font-semibold">Genre Popularity</h3>
+          </div>
+          <ReactEChartsCore echarts={echarts} option={genreOption} style={{ height: 240 }} />
+        </div>
+      </div>
+    </div>
+  )
+}

components/manage/manage-sidebar.tsx

@@ -28,6 +28,12 @@ const navItems: NavItem[] = [
         label: "Dashboard",
         icon: LayoutDashboardIcon,
     },
+    {
+        type: "link",
+        href: "/manage/analytics",
+        label: "Analytics",
+        icon: BarChart3Icon,
+    },
     { type: "divider" },
     { type: "section", label: "Management" },
     { type: "link", href: "/manage/users", label: "Users", icon: UsersIcon, adminOnly: true },