fix: resolve remaining TypeScript and linting errors

- Fixed unused variables in unit tests (elo.test.ts, permissions.test.ts)
- Fixed unused variables in E2E tests (account-acceptance.test.ts, elo-ratings.test.ts, epic1-auth-registration.test.ts, global.setup.ts)
- Fixed 'any' type usage in EditTournamentForm.test.tsx and auth-simple.test.ts
- Fixed unescaped quotes and apostrophes in React components
- Fixed TypeScript type errors in Navigation.tsx, test-api/page.tsx, and matches/upload/page.tsx
- Fixed missing useEffect dependency in tournaments/[id]/entry/page.tsx
- Updated eslint config to exclude test-api directory
- All tests now pass linting and build successfully

src/__tests__/EditTournamentForm.test.tsx

@@ -1,5 +1,5 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest'
-import { render, screen, fireEvent, waitFor } from '@testing-library/react'
+import { describe, it, expect, vi, beforeEach, MockedFunction } from 'vitest'
+import { render, screen, waitFor } from '@testing-library/react'
 import userEvent from '@testing-library/user-event'
 import EditTournamentForm from '@/components/EditTournamentForm'
 
@@ -18,7 +18,8 @@ vi.mock('next/link', () => ({
 }))
 
 // Mock fetch
-global.fetch = vi.fn()
+const mockFetch = vi.fn()
+global.fetch = mockFetch as MockedFunction<typeof global.fetch>
 
 const mockTournament = {
   id: 1,
@@ -65,10 +66,10 @@ describe('EditTournamentForm', () => {
 
   it('submits form with updated data', async () => {
     const user = userEvent.setup()
-    ;(global.fetch as any).mockResolvedValueOnce({
+    mockFetch.mockResolvedValueOnce({
       ok: true,
       json: async () => ({ success: true }),
-    })
+    } as Response)
 
     render(<EditTournamentForm tournament={mockTournament} />)
 
@@ -80,7 +81,7 @@ describe('EditTournamentForm', () => {
     await user.click(submitButton)
 
     await waitFor(() => {
-      expect(global.fetch).toHaveBeenCalledWith(
+      expect(mockFetch).toHaveBeenCalledWith(
         '/api/tournaments/1',
         expect.objectContaining({
           method: 'PUT',
@@ -92,10 +93,10 @@ describe('EditTournamentForm', () => {
 
   it('shows error message on failed submission', async () => {
     const user = userEvent.setup()
-    ;(global.fetch as any).mockResolvedValueOnce({
+    mockFetch.mockResolvedValueOnce({
       ok: false,
       json: async () => ({ error: 'Failed to update tournament' }),
-    })
+    } as Response)
 
     render(<EditTournamentForm tournament={mockTournament} />)
 
@@ -109,14 +110,14 @@ describe('EditTournamentForm', () => {
 
   it('disables submit button while loading', async () => {
     const user = userEvent.setup()
-    ;(global.fetch as any).mockImplementation(
+    mockFetch.mockImplementation(
       () =>
         new Promise((resolve) => {
           setTimeout(() => {
             resolve({
               ok: true,
               json: async () => ({ success: true }),
-            })
+            } as Response)
           }, 100)
         })
     )