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__/unit/elo.test.ts

@@ -141,9 +141,6 @@ describe('Elo Rating System', () => {
       const team1Rating = calculateTeamElo(player1Rating, player2Rating);
       const team2Rating = calculateTeamElo(player3Rating, player4Rating);
       
-      const team1Expected = calculateExpectedScore(team1Rating, team2Rating);
-      const team2Expected = calculateExpectedScore(team2Rating, team1Rating);
-      
       // Team 1 wins (score = 1, team 2 score = 0)
       const team1Change = calculateEloChange(team1Rating, team2Rating, 1, K_FACTOR);
       const team2Change = calculateEloChange(team2Rating, team1Rating, 0, K_FACTOR);