feat(intelligence): add Duplicate Entity Detection

app/src/components/intelligence/EntityDuplicatesPanel.test.tsx

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+import { fireEvent, render, screen } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+
+import { computeEntityDuplicates } from '../../lib/memory/entityDuplicates';
+import type { GraphRelation } from '../../utils/tauriCommands/memory';
+import EntityDuplicatesPanel from './EntityDuplicatesPanel';
+
+function rel(subject: string, object: string): GraphRelation {
+  return {
+    namespace: 'n',
+    subject,
+    predicate: 'p',
+    object,
+    attrs: {},
+    updatedAt: 0,
+    evidenceCount: 1,
+    orderIndex: null,
+    documentIds: [],
+    chunkIds: [],
+  };
+}
+
+const dupReport = computeEntityDuplicates([
+  rel('Alice', 'Bob'),
+  rel('alice', 'Carol'),
+  rel(' Alice ', 'Dave'),
+]);
+
+describe('<EntityDuplicatesPanel />', () => {
+  it('renders the loading skeleton', () => {
+    render(<EntityDuplicatesPanel report={null} loading />);
+    expect(screen.getByTestId('entity-duplicates-loading')).toBeInTheDocument();
+  });
+
+  it('renders the empty state when there is no graph', () => {
+    render(<EntityDuplicatesPanel report={computeEntityDuplicates([])} />);
+    expect(screen.getByText('No knowledge graph yet.')).toBeInTheDocument();
+  });
+
+  it('renders an error with a working retry button', () => {
+    const onRetry = vi.fn();
+    render(<EntityDuplicatesPanel report={null} error="graph unavailable" onRetry={onRetry} />);
+    expect(screen.getByRole('alert').textContent).toMatch(/graph unavailable/);
+    fireEvent.click(screen.getByRole('button', { name: 'Retry' }));
+    expect(onRetry).toHaveBeenCalledTimes(1);
+  });
+
+  it('renders the all-clean message when entities exist but no duplicates', () => {
+    const clean = computeEntityDuplicates([rel('Alice', 'Bob')]);
+    render(<EntityDuplicatesPanel report={clean} />);
+    expect(
+      screen.getByText('No duplicate spellings detected — your entities look clean.')
+    ).toBeInTheDocument();
+  });
+
+  it('renders duplicate clusters with their variants', () => {
+    render(<EntityDuplicatesPanel report={dupReport} />);
+    expect(screen.getByText('Entities')).toBeInTheDocument();
+    expect(screen.getByText('Duplicate sets')).toBeInTheDocument();
+    expect(screen.getByText('Likely duplicate entities')).toBeInTheDocument();
+    // All three spelling variants render. 'Alice' and ' Alice ' both normalize
+    // to the same visible text under Testing Library, so there are two of them.
+    expect(screen.getByText('alice')).toBeInTheDocument();
+    expect(screen.getAllByText('Alice')).toHaveLength(2);
+  });
+});

app/src/components/intelligence/EntityDuplicatesPanel.tsx

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+/**
+ * Duplicate Entity Detection — presentational view. Pure: renders the duplicate
+ * clusters (variant chips + degree) and summary tiles. No data fetching, no
+ * clock, no RNG.
+ */
+import { useT } from '../../lib/i18n/I18nContext';
+import type { DuplicateReport } from '../../lib/memory/entityDuplicates';
+
+const MAX_CLUSTERS = 50;
+
+interface EntityDuplicatesPanelProps {
+  report: DuplicateReport | null;
+  loading?: boolean;
+  error?: string | null;
+  onRetry?: () => void;
+}
+
+const EntityDuplicatesPanel = ({ report, loading, error, onRetry }: EntityDuplicatesPanelProps) => {
+  const { t } = useT();
+
+  const intro = (
+    <div
+      role="note"
+      className="rounded-lg border border-primary-200 dark:border-primary-500/30 bg-primary-50 dark:bg-primary-500/10 px-3 py-2 text-xs text-stone-700 dark:text-neutral-200">
+      <p className="font-medium mb-1">{t('entityDuplicates.title')}</p>
+      <p>{t('entityDuplicates.intro')}</p>
+    </div>
+  );
+
+  if (loading) {
+    return (
+      <div className="space-y-4">
+        {intro}
+        <div
+          className="space-y-3"
+          role="status"
+          aria-label={t('entityDuplicates.loading')}
+          data-testid="entity-duplicates-loading">
+          <div className="grid gap-2 sm:grid-cols-3">
+            {[0, 1, 2].map(i => (
+              <div
+                key={i}
+                className="animate-pulse rounded-lg border border-stone-200 dark:border-neutral-800 bg-stone-50 dark:bg-neutral-800/60 h-16"
+              />
+            ))}
+          </div>
+          {[0, 1, 2].map(i => (
+            <div
+              key={i}
+              className="animate-pulse rounded-lg border border-stone-200 dark:border-neutral-800 bg-stone-50 dark:bg-neutral-800/60 h-12"
+            />
+          ))}
+        </div>
+      </div>
+    );
+  }
+
+  if (error) {
+    return (
+      <div className="space-y-4">
+        {intro}
+        <div className="rounded-lg border border-coral-200 dark:border-coral-500/30 p-4 text-center">
+          <p role="alert" className="text-xs text-coral-700 dark:text-coral-300">
+            {t('entityDuplicates.errorPrefix')} {error}
+          </p>
+          {onRetry && (
+            <button
+              type="button"
+              onClick={onRetry}
+              className="mt-2 rounded-lg bg-primary-500 px-3 py-1.5 text-xs font-semibold text-white hover:bg-primary-600">
+              {t('entityDuplicates.retry')}
+            </button>
+          )}
+        </div>
+      </div>
+    );
+  }
+
+  if (!report || report.entityCount === 0) {
+    return (
+      <div className="space-y-4">
+        {intro}
+        <div className="py-8 text-center">
+          <h3 className="text-sm font-semibold text-stone-700 dark:text-neutral-200">
+            {t('entityDuplicates.empty')}
+          </h3>
+          <p className="mt-1 text-xs text-stone-500 dark:text-neutral-400">
+            {t('entityDuplicates.emptyHint')}
+          </p>
+        </div>
+      </div>
+    );
+  }
+
+  const clusters = report.clusters.slice(0, MAX_CLUSTERS);
+  const truncated = report.clusters.length > MAX_CLUSTERS;
+
+  return (
+    <div className="space-y-4">
+      {intro}
+
+      {/* Summary tiles */}
+      <div className="grid gap-2 sm:grid-cols-3">
+        {[
+          { label: t('entityDuplicates.metricEntities'), value: report.entityCount },
+          { label: t('entityDuplicates.metricClusters'), value: report.clusterCount },
+          { label: t('entityDuplicates.metricAffected'), value: report.affectedEntities },
+        ].map(tile => (
+          <div
+            key={tile.label}
+            className="rounded-lg border border-stone-200 dark:border-neutral-800 p-3">
+            <div className="text-[10px] uppercase tracking-wider text-stone-400 dark:text-neutral-500">
+              {tile.label}
+            </div>
+            <div className="text-lg font-semibold tabular-nums text-stone-900 dark:text-neutral-100">
+              {tile.value}
+            </div>
+          </div>
+        ))}
+      </div>
+
+      {report.clusterCount === 0 ? (
+        <p className="py-4 text-center text-sm text-sage-700 dark:text-sage-300">
+          {t('entityDuplicates.allClean')}
+        </p>
+      ) : (
+        <section aria-labelledby="entity-duplicates-heading" className="space-y-1.5">
+          <h3
+            id="entity-duplicates-heading"
+            className="text-xs font-semibold uppercase tracking-wider text-stone-500 dark:text-neutral-400">
+            {t('entityDuplicates.heading')}
+          </h3>
+          <ul className="space-y-1.5">
+            {clusters.map(cluster => (
+              <li
+                key={cluster.normalized}
+                className="rounded-lg border border-stone-200 dark:border-neutral-800 px-3 py-2">
+                <div className="flex flex-wrap items-center gap-1.5">
+                  {cluster.variants.map(variant => (
+                    <span
+                      key={variant.id}
+                      title={t('entityDuplicates.variantTitle').replace(
+                        '{degree}',
+                        String(variant.degree)
+                      )}
+                      className="inline-flex items-center gap-1 rounded-md border border-stone-200 dark:border-neutral-700 px-1.5 py-0.5 text-[11px] text-stone-800 dark:text-neutral-100">
+                      <span className="break-words">
+                        {variant.id || t('entityDuplicates.blankEntity')}
+                      </span>
+                      <span className="tabular-nums text-stone-400 dark:text-neutral-500">
+                        {variant.degree}
+                      </span>
+                    </span>
+                  ))}
+                </div>
+              </li>
+            ))}
+          </ul>
+          {truncated && (
+            <p className="text-center text-xs text-stone-400 dark:text-neutral-500">
+              {t('entityDuplicates.truncated')
+                .replace('{shown}', String(clusters.length))
+                .replace('{total}', String(report.clusterCount))}
+            </p>
+          )}
+        </section>
+      )}
+    </div>
+  );
+};
+
+export default EntityDuplicatesPanel;

app/src/components/intelligence/EntityDuplicatesTab.test.tsx

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+import { fireEvent, render, screen, waitFor } from '@testing-library/react';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { computeEntityDuplicates } from '../../lib/memory/entityDuplicates';
+import type { GraphRelation } from '../../utils/tauriCommands/memory';
+import EntityDuplicatesTab from './EntityDuplicatesTab';
+
+const mockLoad = vi.fn();
+const mockLoadNamespaces = vi.fn();
+
+vi.mock('../../services/api/entityDuplicatesApi', () => ({
+  loadEntityDuplicates: (...args: unknown[]) => mockLoad(...args),
+  loadNamespaces: (...args: unknown[]) => mockLoadNamespaces(...args),
+}));
+
+function rel(subject: string, object: string): GraphRelation {
+  return {
+    namespace: 'n',
+    subject,
+    predicate: 'p',
+    object,
+    attrs: {},
+    updatedAt: 0,
+    evidenceCount: 1,
+    orderIndex: null,
+    documentIds: [],
+    chunkIds: [],
+  };
+}
+
+const report = computeEntityDuplicates([rel('Alice', 'Bob'), rel('alice', 'Carol')]);
+
+describe('<EntityDuplicatesTab />', () => {
+  beforeEach(() => {
+    mockLoad.mockReset();
+    mockLoadNamespaces.mockReset();
+    mockLoad.mockResolvedValue(report);
+    mockLoadNamespaces.mockResolvedValue([]);
+  });
+
+  it('loads on mount and renders the clusters', async () => {
+    render(<EntityDuplicatesTab />);
+    expect(mockLoad).toHaveBeenCalledWith(undefined);
+    await waitFor(() => expect(screen.getByText('Likely duplicate entities')).toBeInTheDocument());
+  });
+
+  it('shows the namespace selector and re-queries on change', async () => {
+    mockLoadNamespaces.mockResolvedValueOnce(['work', 'personal']);
+    render(<EntityDuplicatesTab />);
+    await waitFor(() => screen.getByRole('combobox'));
+    fireEvent.change(screen.getByRole('combobox'), { target: { value: 'work' } });
+    await waitFor(() => expect(mockLoad).toHaveBeenCalledWith('work'));
+  });
+
+  it('surfaces an error when the load fails', async () => {
+    mockLoad.mockReset();
+    mockLoad.mockRejectedValueOnce(new Error('graph unavailable'));
+    render(<EntityDuplicatesTab />);
+    await waitFor(() => expect(screen.getByRole('alert').textContent).toMatch(/graph unavailable/));
+  });
+});

app/src/components/intelligence/EntityDuplicatesTab.tsx

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+/**
+ * Duplicate Entity Detection tab (container). Load-on-mount + namespace
+ * selector; delegates rendering to the pure <EntityDuplicatesPanel>. Read-only.
+ */
+import { useCallback, useEffect, useRef, useState } from 'react';
+
+import { useT } from '../../lib/i18n/I18nContext';
+import type { DuplicateReport } from '../../lib/memory/entityDuplicates';
+import { loadEntityDuplicates, loadNamespaces } from '../../services/api/entityDuplicatesApi';
+import EntityDuplicatesPanel from './EntityDuplicatesPanel';
+
+const EntityDuplicatesTab = () => {
+  const { t } = useT();
+  const [report, setReport] = useState<DuplicateReport | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [namespaces, setNamespaces] = useState<string[]>([]);
+  const [namespace, setNamespace] = useState('');
+  // Monotonic token: ignore a response if a newer load has since started.
+  const latestRequestId = useRef(0);
+
+  const load = useCallback(async (ns: string) => {
+    const requestId = (latestRequestId.current += 1);
+    setLoading(true);
+    setError(null);
+    try {
+      const next = await loadEntityDuplicates(ns || undefined);
+      if (requestId !== latestRequestId.current) return;
+      setReport(next);
+    } catch (err) {
+      if (requestId !== latestRequestId.current) return;
+      setError(err instanceof Error ? err.message : String(err));
+    } finally {
+      if (requestId === latestRequestId.current) setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    loadNamespaces()
+      .then(setNamespaces)
+      .catch(() => setNamespaces([]));
+    void load('');
+  }, [load]);
+
+  const handleNamespace = (next: string): void => {
+    setNamespace(next);
+    void load(next);
+  };
+
+  return (
+    <div className="space-y-4">
+      {namespaces.length > 0 && (
+        <label className="flex items-center gap-2 text-xs text-stone-600 dark:text-neutral-300">
+          {t('entityDuplicates.namespaceLabel')}
+          <select
+            value={namespace}
+            onChange={e => handleNamespace(e.target.value)}
+            className="rounded-lg border border-stone-200 dark:border-neutral-700 bg-white dark:bg-neutral-900 px-2 py-1 text-sm text-stone-800 dark:text-neutral-100">
+            <option value="">{t('entityDuplicates.namespaceAll')}</option>
+            {namespaces.map(ns => (
+              <option key={ns} value={ns}>
+                {ns}
+              </option>
+            ))}
+          </select>
+        </label>
+      )}
+
+      <EntityDuplicatesPanel
+        report={report}
+        loading={loading}
+        error={error}
+        onRetry={() => void load(namespace)}
+      />
+    </div>
+  );
+};
+
+export default EntityDuplicatesTab;