Add component tests for EndRunModal, GameGrid, RulesConfiguration, Layout

33 tests covering rendering, user interactions (userEvent clicks), prop
callbacks, filter state, and conditional description text. Adds a
matchMedia stub to the vitest setup file so components importing
useTheme don't throw in jsdom. Also adds actionlint and zizmor
pre-commit hooks for GitHub Actions linting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/RulesConfiguration.test.tsx

@@ -0,0 +1,84 @@
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { RulesConfiguration } from './RulesConfiguration'
+import { DEFAULT_RULES } from '../types/rules'
+import type { NuzlockeRules } from '../types/rules'
+
+function setup(overrides: Partial<React.ComponentProps<typeof RulesConfiguration>> = {}) {
+  const props = {
+    rules: { ...DEFAULT_RULES },
+    onChange: vi.fn(),
+    ...overrides,
+  }
+  render(<RulesConfiguration {...props} />)
+  return props
+}
+
+describe('RulesConfiguration', () => {
+  it('renders all rule section headings', () => {
+    setup()
+    expect(screen.getByText('Core Rules')).toBeInTheDocument()
+    expect(screen.getByText('Playstyle')).toBeInTheDocument()
+    expect(screen.getByText('Run Variant')).toBeInTheDocument()
+    expect(screen.getByText('Type Restriction')).toBeInTheDocument()
+  })
+
+  it('renders the enabled/total count', () => {
+    setup()
+    expect(screen.getByText(/\d+ of \d+ rules enabled/)).toBeInTheDocument()
+  })
+
+  it('renders the Reset to Default button', () => {
+    setup()
+    expect(screen.getByRole('button', { name: /reset to default/i })).toBeInTheDocument()
+  })
+
+  it('calls onChange with updated rules when a rule is toggled off', async () => {
+    const { onChange } = setup()
+    // RuleToggle renders a role="switch" with no accessible name; navigate
+    // to it via the sibling label text.
+    const label = screen.getByText('Duplicates Clause')
+    // Structure: span → .flex.items-center.gap-2 → .flex-1.pr-4 → row div → switch button
+    const switchEl = label
+      .closest('div[class]')
+      ?.parentElement?.parentElement?.querySelector('[role="switch"]') as HTMLElement
+    await userEvent.click(switchEl)
+    expect(onChange).toHaveBeenCalledWith(expect.objectContaining({ duplicatesClause: false }))
+  })
+
+  it('calls onChange with DEFAULT_RULES when Reset to Default is clicked', async () => {
+    const { onChange } = setup({ rules: { ...DEFAULT_RULES, duplicatesClause: false } })
+    await userEvent.click(screen.getByRole('button', { name: /reset to default/i }))
+    expect(onChange).toHaveBeenCalledWith(DEFAULT_RULES)
+  })
+
+  it('calls onReset when Reset to Default is clicked', async () => {
+    const onReset = vi.fn()
+    setup({ onReset })
+    await userEvent.click(screen.getByRole('button', { name: /reset to default/i }))
+    expect(onReset).toHaveBeenCalledOnce()
+  })
+
+  it('toggles a type on when a type button is clicked', async () => {
+    const { onChange } = setup()
+    await userEvent.click(screen.getByRole('button', { name: /fire/i }))
+    expect(onChange).toHaveBeenCalledWith(expect.objectContaining({ allowedTypes: ['fire'] }))
+  })
+
+  it('shows Clear selection button when types are selected', () => {
+    setup({ rules: { ...DEFAULT_RULES, allowedTypes: ['fire'] } })
+    expect(screen.getByRole('button', { name: /clear selection/i })).toBeInTheDocument()
+  })
+
+  it('clears selected types when Clear selection is clicked', async () => {
+    const { onChange } = setup({ rules: { ...DEFAULT_RULES, allowedTypes: ['fire', 'water'] } })
+    await userEvent.click(screen.getByRole('button', { name: /clear selection/i }))
+    expect(onChange).toHaveBeenCalledWith(expect.objectContaining({ allowedTypes: [] }))
+  })
+
+  it('hides rules in the hiddenRules set', () => {
+    const hiddenRules = new Set<keyof NuzlockeRules>(['duplicatesClause'])
+    setup({ hiddenRules })
+    expect(screen.queryByText('Duplicates Clause')).not.toBeInTheDocument()
+  })
+})