diff --git a/dashboards/tracker-web/package.json b/dashboards/tracker-web/package.json
index a0965390..bd25c674 100644
--- a/dashboards/tracker-web/package.json
+++ b/dashboards/tracker-web/package.json
@@ -26,9 +26,11 @@
     "@azure/keyvault-secrets": "^4.10.0",
     "@bytelyst/api-client": "workspace:*",
     "@bytelyst/auth-ui": "workspace:*",
+    "@bytelyst/charts": "workspace:*",
     "@bytelyst/config": "workspace:*",
     "@bytelyst/dashboard-components": "workspace:*",
     "@bytelyst/data-table": "workspace:*",
+    "@bytelyst/data-viz": "workspace:*",
     "@bytelyst/design-tokens": "workspace:*",
     "@bytelyst/errors": "workspace:*",
     "@bytelyst/notifications-ui": "workspace:*",
diff --git a/dashboards/tracker-web/src/__tests__/overview-charts.test.tsx b/dashboards/tracker-web/src/__tests__/overview-charts.test.tsx
new file mode 100644
index 00000000..07a17ebb
--- /dev/null
+++ b/dashboards/tracker-web/src/__tests__/overview-charts.test.tsx
@@ -0,0 +1,71 @@
+/**
+ * UX-4.3 — overview data-viz transforms + render safety.
+ *
+ * Renders the dashboard overview chart surface with a mocked `getStats`
+ * payload through react-dom/server (no DOM/jsdom needed) and asserts the
+ * produced SVG markup contains no `NaN` path data. Also unit-tests the pure
+ * transforms in `@/lib/overview-charts` for finite, correctly-mapped output.
+ *
+ * @see docs/roadmaps/UX_INTEGRATION_BYTELYST.md (UX-4)
+ */
+
+import { describe, it, expect } from 'vitest';
+import { createElement } from 'react';
+import { renderToStaticMarkup } from 'react-dom/server';
+import OverviewCharts from '@/components/overview-charts';
+import { statusSlices, typeSlices, priorityBars, overviewKpis } from '@/lib/overview-charts';
+import type { TrackerStats } from '@/lib/tracker-client';
+
+const STATS: TrackerStats = {
+  productId: 'tracker-test',
+  total: 42,
+  byType: { bug: 10, feature: 30, task: 2 },
+  byStatus: { open: 20, in_progress: 12, done: 10 },
+  byPriority: { critical: 2, high: 10, medium: 20, low: 10 },
+};
+
+const EMPTY_STATS: TrackerStats = {
+  productId: 'tracker-test',
+  total: 0,
+  byType: {},
+  byStatus: {},
+  byPriority: {},
+};
+
+describe('overview-charts transforms', () => {
+  it('maps status/type entries to donut slices with finite values', () => {
+    const slices = [...statusSlices(STATS), ...typeSlices(STATS)];
+    expect(slices.length).toBe(6);
+    for (const s of slices) {
+      expect(Number.isFinite(s.value)).toBe(true);
+      expect(s.value).toBeGreaterThanOrEqual(0);
+      expect(s.color).toMatch(/var\(--bl-chart-/);
+    }
+    expect(statusSlices(STATS).find(s => s.id === 'open')?.value).toBe(20);
+  });
+
+  it('orders priority bars critical → low with finite values', () => {
+    const bars = priorityBars(STATS);
+    expect(bars.map(b => b.id)).toEqual(['critical', 'high', 'medium', 'low']);
+    for (const b of bars) expect(Number.isFinite(b.value)).toBe(true);
+  });
+
+  it('coerces missing / non-finite KPIs to 0', () => {
+    expect(overviewKpis(STATS)).toEqual({ total: 42, open: 20, inProgress: 12, done: 10 });
+    expect(overviewKpis(EMPTY_STATS)).toEqual({ total: 0, open: 0, inProgress: 0, done: 0 });
+  });
+});
+
+describe('OverviewCharts render safety', () => {
+  it('renders mocked stats without NaN in the SVG paths', () => {
+    const html = renderToStaticMarkup(createElement(OverviewCharts, { stats: STATS }));
+    expect(html).toContain('<svg');
+    expect(html).not.toContain('NaN');
+    expect(html).toContain('42');
+  });
+
+  it('renders empty stats without NaN (empty donut ring)', () => {
+    const html = renderToStaticMarkup(createElement(OverviewCharts, { stats: EMPTY_STATS }));
+    expect(html).not.toContain('NaN');
+  });
+});
diff --git a/dashboards/tracker-web/src/app/dashboard/page.tsx b/dashboards/tracker-web/src/app/dashboard/page.tsx
index 1ca883f7..868a68ed 100644
--- a/dashboards/tracker-web/src/app/dashboard/page.tsx
+++ b/dashboards/tracker-web/src/app/dashboard/page.tsx
@@ -1,46 +1,19 @@
 'use client';
 
 import { useEffect, useState } from 'react';
+import dynamic from 'next/dynamic';
 import { PageHeader, LoadingSpinner } from '@bytelyst/dashboard-components';
-import { MetricCard, AlertBanner } from '@/components/ui/Primitives';
+import { KpiCard } from '@bytelyst/data-viz';
+import { AlertBanner, Skeleton } from '@/components/ui/Primitives';
 import { useAuth } from '@/lib/auth-context';
 import { getStats, type TrackerStats } from '@/lib/tracker-client';
+import { overviewKpis } from '@/lib/overview-charts';
 
-const STAT_COLORS: Record<string, string> = {
-  bug: 'bg-red-100 text-red-800 dark:bg-red-900/30 dark:text-red-300',
-  feature: 'bg-blue-100 text-blue-800 dark:bg-blue-900/30 dark:text-blue-300',
-  task: 'bg-amber-100 text-amber-800 dark:bg-amber-900/30 dark:text-amber-300',
-  open: 'bg-green-100 text-green-800 dark:bg-green-900/30 dark:text-green-300',
-  in_progress: 'bg-yellow-100 text-yellow-800 dark:bg-yellow-900/30 dark:text-yellow-300',
-  done: 'bg-emerald-100 text-emerald-800 dark:bg-emerald-900/30 dark:text-emerald-300',
-  closed: 'bg-gray-100 text-gray-800 dark:bg-gray-900/30 dark:text-gray-300',
-  wont_fix: 'bg-gray-100 text-gray-600 dark:bg-gray-900/30 dark:text-gray-400',
-  critical: 'bg-red-100 text-red-800 dark:bg-red-900/30 dark:text-red-300',
-  high: 'bg-orange-100 text-orange-800 dark:bg-orange-900/30 dark:text-orange-300',
-  medium: 'bg-yellow-100 text-yellow-800 dark:bg-yellow-900/30 dark:text-yellow-300',
-  low: 'bg-green-100 text-green-800 dark:bg-green-900/30 dark:text-green-300',
-};
-
-function StatCard({ title, entries }: { title: string; entries: Record<string, number> }) {
-  return (
-    <div className="rounded-xl border border-border bg-card p-5">
-      <h3 className="mb-3 text-sm font-semibold uppercase tracking-wider text-muted-foreground">
-        {title}
-      </h3>
-      <div className="flex flex-wrap gap-2">
-        {Object.entries(entries).map(([key, count]) => (
-          <span
-            key={key}
-            className={`inline-flex items-center gap-1.5 rounded-full px-3 py-1 text-sm font-medium ${STAT_COLORS[key] || 'bg-muted text-muted-foreground'}`}
-          >
-            {key.replace(/_/g, ' ')}
-            <span className="font-bold">{count}</span>
-          </span>
-        ))}
-      </div>
-    </div>
-  );
-}
+// Heavy SVG chart surface — kept out of the initial route bundle (UX-4 / CC.7).
+const OverviewCharts = dynamic(() => import('@/components/overview-charts'), {
+  ssr: false,
+  loading: () => <Skeleton className="h-64 w-full" />,
+});
 
 export default function DashboardOverview() {
   const { token } = useAuth();
@@ -54,6 +27,8 @@ export default function DashboardOverview() {
       .catch(err => setError(err.message));
   }, [token]);
 
+  const kpis = stats ? overviewKpis(stats) : null;
+
   return (
     <div className="space-y-6">
       <PageHeader title="Dashboard" />
@@ -65,21 +40,18 @@ export default function DashboardOverview() {
         </AlertBanner>
       )}
 
-      {stats ? (
+      {stats && kpis ? (
         <div className="space-y-4">
-          {/* Total count */}
-          <MetricCard
-            label={`Total items for ${stats.productId}`}
-            value={stats.total}
-            helper="All tracked items"
-          />
-
-          {/* Breakdown cards */}
-          <div className="grid gap-4 md:grid-cols-3">
-            <StatCard title="By Type" entries={stats.byType} />
-            <StatCard title="By Status" entries={stats.byStatus} />
-            <StatCard title="By Priority" entries={stats.byPriority} />
+          {/* KPI row */}
+          <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
+            <KpiCard label={`Total · ${stats.productId}`} value={kpis.total} />
+            <KpiCard label="Open" value={kpis.open} />
+            <KpiCard label="In Progress" value={kpis.inProgress} />
+            <KpiCard label="Done" value={kpis.done} />
           </div>
+
+          {/* Charts */}
+          <OverviewCharts stats={stats} />
         </div>
       ) : !error ? (
         <div className="flex justify-center py-10">
diff --git a/dashboards/tracker-web/src/components/overview-charts.tsx b/dashboards/tracker-web/src/components/overview-charts.tsx
new file mode 100644
index 00000000..ad13aade
--- /dev/null
+++ b/dashboards/tracker-web/src/components/overview-charts.tsx
@@ -0,0 +1,78 @@
+'use client';
+
+import { Donut, BarChart } from '@bytelyst/charts';
+import { Card, CardHeader, CardTitle } from '@/components/ui/Primitives';
+import { statusSlices, typeSlices, priorityBars } from '@/lib/overview-charts';
+import type { TrackerStats } from '@/lib/tracker-client';
+
+/**
+ * Heavy chart surface for the dashboard overview (UX-4.2). Imported via
+ * next/dynamic from the overview page so the SVG chart code stays out of the
+ * initial route bundle.
+ */
+export default function OverviewCharts({ stats }: { stats: TrackerStats }) {
+  const statuses = statusSlices(stats);
+  const types = typeSlices(stats);
+  const priorities = priorityBars(stats);
+
+  return (
+    <div className="grid gap-4 md:grid-cols-3">
+      <Card className="flex flex-col items-center p-5">
+        <CardHeader className="w-full">
+          <CardTitle className="text-sm font-semibold uppercase tracking-wider text-muted-foreground">
+            By Status
+          </CardTitle>
+        </CardHeader>
+        <Donut
+          slices={statuses}
+          size={180}
+          ariaLabel="Items by status"
+          centerContent={<div className="text-2xl font-bold text-foreground">{stats.total}</div>}
+        />
+        <ChartLegend slices={statuses} />
+      </Card>
+
+      <Card className="flex flex-col items-center p-5">
+        <CardHeader className="w-full">
+          <CardTitle className="text-sm font-semibold uppercase tracking-wider text-muted-foreground">
+            By Type
+          </CardTitle>
+        </CardHeader>
+        <Donut slices={types} size={180} ariaLabel="Items by type" />
+        <ChartLegend slices={types} />
+      </Card>
+
+      <Card className="p-5">
+        <CardHeader>
+          <CardTitle className="text-sm font-semibold uppercase tracking-wider text-muted-foreground">
+            By Priority
+          </CardTitle>
+        </CardHeader>
+        <BarChart
+          data={priorities}
+          width={360}
+          height={200}
+          ariaLabel="Items by priority"
+          className="w-full"
+        />
+      </Card>
+    </div>
+  );
+}
+
+function ChartLegend({ slices }: { slices: { id: string; label?: string; color?: string }[] }) {
+  return (
+    <ul className="mt-4 flex w-full flex-wrap justify-center gap-x-4 gap-y-1 text-xs text-muted-foreground">
+      {slices.map(s => (
+        <li key={s.id} className="flex items-center gap-1.5">
+          <span
+            aria-hidden="true"
+            className="h-2 w-2 rounded-full"
+            style={{ background: s.color }}
+          />
+          {s.label ?? s.id}
+        </li>
+      ))}
+    </ul>
+  );
+}
diff --git a/dashboards/tracker-web/src/lib/overview-charts.ts b/dashboards/tracker-web/src/lib/overview-charts.ts
new file mode 100644
index 00000000..ead4231b
--- /dev/null
+++ b/dashboards/tracker-web/src/lib/overview-charts.ts
@@ -0,0 +1,82 @@
+/**
+ * Pure helpers that map TrackerStats into @bytelyst/charts + @bytelyst/data-viz
+ * data shapes for the dashboard overview (UX-4).
+ *
+ * Kept separate from the page component so the transforms are unit-testable
+ * (no DOM needed) and guaranteed to emit only finite numbers — protecting the
+ * SVG charts from NaN path data.
+ *
+ * @see docs/roadmaps/UX_INTEGRATION_BYTELYST.md (UX-4)
+ */
+
+import type { DonutSlice, BarDatum } from '@bytelyst/charts';
+import type { TrackerStats } from './tracker-client';
+
+/** Cycle the bridged --bl-chart-* palette (maps onto tracker's --chart-1..5). */
+export const CHART_PALETTE = [
+  'var(--bl-chart-1)',
+  'var(--bl-chart-2)',
+  'var(--bl-chart-3)',
+  'var(--bl-chart-4)',
+  'var(--bl-chart-5)',
+] as const;
+
+const LABELS: Record<string, string> = {
+  open: 'Open',
+  in_progress: 'In Progress',
+  done: 'Done',
+  closed: 'Closed',
+  wont_fix: "Won't Fix",
+  bug: 'Bug',
+  feature: 'Feature',
+  task: 'Task',
+  critical: 'Critical',
+  high: 'High',
+  medium: 'Medium',
+  low: 'Low',
+};
+
+/** Coerce any value to a finite, non-negative number (no NaN reaches the SVG). */
+const safe = (v: number | undefined): number =>
+  typeof v === 'number' && Number.isFinite(v) ? Math.max(0, v) : 0;
+
+function toSlices(entries: Record<string, number>): DonutSlice[] {
+  return Object.entries(entries).map(([key, value], i) => ({
+    id: key,
+    value: safe(value),
+    label: LABELS[key] ?? key,
+    color: CHART_PALETTE[i % CHART_PALETTE.length],
+  }));
+}
+
+export const statusSlices = (stats: TrackerStats): DonutSlice[] => toSlices(stats.byStatus);
+export const typeSlices = (stats: TrackerStats): DonutSlice[] => toSlices(stats.byType);
+
+/** Priority bars in a fixed, meaningful order (critical → low). */
+export function priorityBars(stats: TrackerStats): BarDatum[] {
+  const order = ['critical', 'high', 'medium', 'low'];
+  return order
+    .filter(key => key in stats.byPriority)
+    .map((key, i) => ({
+      id: key,
+      value: safe(stats.byPriority[key]),
+      label: LABELS[key] ?? key,
+      color: CHART_PALETTE[i % CHART_PALETTE.length],
+    }));
+}
+
+export interface OverviewKpis {
+  total: number;
+  open: number;
+  inProgress: number;
+  done: number;
+}
+
+export function overviewKpis(stats: TrackerStats): OverviewKpis {
+  return {
+    total: safe(stats.total),
+    open: safe(stats.byStatus.open),
+    inProgress: safe(stats.byStatus.in_progress),
+    done: safe(stats.byStatus.done),
+  };
+}
diff --git a/dashboards/tracker-web/vitest.config.ts b/dashboards/tracker-web/vitest.config.ts
index 40370b4a..a0cef323 100644
--- a/dashboards/tracker-web/vitest.config.ts
+++ b/dashboards/tracker-web/vitest.config.ts
@@ -32,5 +32,9 @@ export default defineConfig({
     alias: {
       '@': path.resolve(__dirname, './src'),
     },
+    // Workspace packages (e.g. @bytelyst/charts) can resolve their own React
+    // copy via the pnpm store; dedupe so SSR render tests use a single React
+    // instance (avoids the "Invalid hook call" dual-package hazard).
+    dedupe: ['react', 'react-dom'],
   },
 });
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 0ea5095a..40bb3a0a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -246,6 +246,9 @@ importers:
       '@bytelyst/auth-ui':
         specifier: workspace:*
         version: link:../../packages/auth-ui
+      '@bytelyst/charts':
+        specifier: workspace:*
+        version: link:../../packages/charts
       '@bytelyst/config':
         specifier: workspace:*
         version: link:../../packages/config
@@ -255,6 +258,9 @@ importers:
       '@bytelyst/data-table':
         specifier: workspace:*
         version: link:../../packages/data-table
+      '@bytelyst/data-viz':
+        specifier: workspace:*
+        version: link:../../packages/data-viz
       '@bytelyst/design-tokens':
         specifier: workspace:*
         version: link:../../packages/design-tokens