feat(tests): adicionar testes de regras PDF e componentes frontend

Backend:
- test_pdf_rules.py: 108 testes para regras de pontuação do PDF
- test_pdf_selos.py: validação de selos disponíveis

Frontend:
- Configuração Vitest para testes de componentes React
- FiltroSelos.test.jsx: testes do componente de filtro
- Header.test.jsx: testes do componente de cabeçalho

frontend/src/components/__tests__/FiltroSelos.test.jsx

@@ -0,0 +1,27 @@
+import { render, screen, fireEvent } from '@testing-library/react';
+import FiltroSelos from '../FiltroSelos';
+
+describe('FiltroSelos', () => {
+  it('applies selected seals', () => {
+    const handleChange = vi.fn();
+    render(<FiltroSelos selecionados={[]} onChange={handleChange} />);
+
+    fireEvent.click(screen.getByRole('button', { name: /Filtrar por selos/i }));
+
+    const checkbox = screen.getByLabelText(/Coord\./i);
+    fireEvent.click(checkbox);
+
+    fireEvent.click(screen.getByRole('button', { name: /Aplicar/i }));
+
+    expect(handleChange).toHaveBeenCalledWith(['CA']);
+  });
+
+  it('clears filters from the trigger when active', () => {
+    const handleChange = vi.fn();
+    render(<FiltroSelos selecionados={['CA']} onChange={handleChange} />);
+
+    fireEvent.click(screen.getByTitle('Limpar filtros'));
+
+    expect(handleChange).toHaveBeenCalledWith([]);
+  });
+});

frontend/src/components/__tests__/Header.test.jsx

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+import { render, screen, fireEvent } from '@testing-library/react';
+import Header from '../Header';
+
+describe('Header', () => {
+  it('renders the title and total count', () => {
+    render(<Header total={1000} />);
+
+    expect(screen.getByText('Ranking de Consultores CAPES')).toBeInTheDocument();
+    expect(screen.getByText(/Total:\s+1\.000 consultores/)).toBeInTheDocument();
+  });
+
+  it('opens the criteria modal when a block is clicked', () => {
+    render(<Header total={0} />);
+
+    fireEvent.click(screen.getByText('A - Coordenacao CAPES'));
+
+    expect(screen.getByText(/Coordena/)).toBeInTheDocument();
+  });
+});