feat: Enhance Contributor Risk Table with Live Search and Sorting Features

components/burnout/BurnoutRiskTable.test.tsx

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+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen, fireEvent } from '@testing-library/react';
+import BurnoutRiskTable from './BurnoutRiskTable';
+
+const mockContributors = [
+  {
+    username: 'alice',
+    avatarUrl: 'https://github.com/alice.png',
+    totalCommits: 500,
+    commitShare: 50,
+    burnoutScore: 85,
+    riskLevel: 'High' as const,
+    activeWeeks: 12,
+    highIntensityWeeks: 6,
+    consecutiveHighWeeks: 4,
+    restWeeks: 0,
+    recentTrend: [10, 20, 30],
+  },
+  {
+    username: 'bob',
+    avatarUrl: 'https://github.com/bob.png',
+    totalCommits: 300,
+    commitShare: 30,
+    burnoutScore: 60,
+    riskLevel: 'Medium' as const,
+    activeWeeks: 8,
+    highIntensityWeeks: 2,
+    consecutiveHighWeeks: 1,
+    restWeeks: 2,
+    recentTrend: [5, 10, 15],
+  },
+  {
+    username: 'charlie',
+    avatarUrl: 'https://github.com/charlie.png',
+    totalCommits: 200,
+    commitShare: 20,
+    burnoutScore: 20,
+    riskLevel: 'Low' as const,
+    activeWeeks: 4,
+    highIntensityWeeks: 0,
+    consecutiveHighWeeks: 0,
+    restWeeks: 6,
+    recentTrend: [2, 4, 6],
+  },
+];
+
+describe('BurnoutRiskTable Live Search & Column Sorting', () => {
+  beforeEach(() => {
+    // cleanup
+  });
+
+  it('renders all contributors initially', () => {
+    render(<BurnoutRiskTable contributors={mockContributors} />);
+    expect(screen.getByText('@alice')).toBeInTheDocument();
+    expect(screen.getByText('@bob')).toBeInTheDocument();
+    expect(screen.getByText('@charlie')).toBeInTheDocument();
+    expect(screen.getByText(/Showing 3 of 3/i)).toBeInTheDocument();
+  });
+
+  it('filters contributors dynamically by search query', () => {
+    render(<BurnoutRiskTable contributors={mockContributors} />);
+    const searchInput = screen.getByPlaceholderText(/search contributor/i);
+
+    fireEvent.change(searchInput, { target: { value: 'bob' } });
+
+    expect(screen.getByText('@bob')).toBeInTheDocument();
+    expect(screen.queryByText('@alice')).not.toBeInTheDocument();
+    expect(screen.queryByText('@charlie')).not.toBeInTheDocument();
+    expect(screen.getByText(/Showing 1 of 3/i)).toBeInTheDocument();
+  });
+
+  it('filters contributors to high risk only when toggle is enabled', () => {
+    render(<BurnoutRiskTable contributors={mockContributors} />);
+    const toggleBtn = screen.getByRole('button', { name: /high risk only/i });
+
+    fireEvent.click(toggleBtn);
+
+    expect(screen.getByText('@alice')).toBeInTheDocument();
+    expect(screen.queryByText('@bob')).not.toBeInTheDocument();
+    expect(screen.queryByText('@charlie')).not.toBeInTheDocument();
+    expect(screen.getByText(/Showing 1 of 3/i)).toBeInTheDocument();
+  });
+
+  it('sorts contributors by username when Contributor header is clicked', () => {
+    render(<BurnoutRiskTable contributors={mockContributors} />);
+    const contributorHeaderBtn = screen.getByRole('button', { name: /contributor/i });
+
+    // Initial default sort is burnoutScore desc (alice, bob, charlie)
+    fireEvent.click(contributorHeaderBtn); // Sort by username desc (charlie, bob, alice)
+
+    const namesDesc = screen.getAllByText(/@(alice|bob|charlie)/i).map((el) => el.textContent);
+    expect(namesDesc).toEqual(['@charlie', '@bob', '@alice']);
+
+    fireEvent.click(contributorHeaderBtn); // Toggle to asc (alice, bob, charlie)
+    const namesAsc = screen.getAllByText(/@(alice|bob|charlie)/i).map((el) => el.textContent);
+    expect(namesAsc).toEqual(['@alice', '@bob', '@charlie']);
+  });
+
+  it('shows empty state and resets filters when Reset Filters button is clicked', () => {
+    render(<BurnoutRiskTable contributors={mockContributors} />);
+    const searchInput = screen.getByPlaceholderText(/search contributor/i);
+
+    fireEvent.change(searchInput, { target: { value: 'nonexistent_user' } });
+
+    expect(screen.getByText(/No contributors match your filters/i)).toBeInTheDocument();
+
+    const resetBtn = screen.getByRole('button', { name: /reset filters/i });
+    fireEvent.click(resetBtn);
+
+    expect(screen.getByText('@alice')).toBeInTheDocument();
+    expect(screen.getByText('@bob')).toBeInTheDocument();
+    expect(screen.getByText('@charlie')).toBeInTheDocument();
+  });
+});