- Remove production DB dump (db_backup_*.sql) and update.log from git tracking
- Add DB backups to .gitignore
- Replace all console.log/console.error with structured logger module
- Translate Dutch error messages to English (link-discord.ts)
- Remove dead code blocks (register-form.tsx false && pattern)
- Add ESLint flat config with TypeScript, React, Next.js, jsx-a11y, and security plugins
- Add Prettier config
- Add eslint-plugin-security for security-aware linting
- Fix all 119+ ESLint warnings across the codebase:
- Resolve security/detect-object-injection with safe access patterns
- Resolve security/detect-non-literal-fs-filename with path traversal validation
- Replace <img> with next/image <Image> component
- Remove unused variables and imports
- Replace non-null assertions with proper type guards
- Replace <a> with <Link> for internal navigation
- Use next/script Script component for external scripts
- Fix setState-in-useEffect anti-patterns (navbar-color-picker, logo-generator, theme-switcher)
- Add lint and format scripts to package.json
All checks: typecheck ✓, tests 58/58 ✓, lint 0 errors 0 warnings ✓
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