Implement Essential Quality Gates: CI, Pre-Commit, Tests, Error Handling, Security Headers

**Goal**: Implement essential quality gates to improve code quality, prevent regressions, and secure the codebase.

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### Tasks
- Set up GitHub Actions CI for lint, typecheck, and tests
- Configure pre-commit hooks with Husky and lint-staged
- Add/Improve test coverage for `/src/lib/pocketbase.ts`, `/src/lib/utils.ts`, `/src/hooks/*`
- Add a basic ErrorBoundary component for error capture
- Add security headers in `next.config.mjs`

**References:** See [QUICK_WINS.md](https://github.com/adhit-r/aran/blob/main/QUICK_WINS.md)

**Acceptance Criteria**
- CI runs on PRs and pushes
- Pre-commit hooks prevent malformed code
- Core utils are covered by tests
- Console error tracking added with ErrorBoundary
- Minimum security headers set in app config

Start with QUICK_WINS.md, then inspect next.config.mjs, /src/lib/pocketbase.ts, /src/lib/utils.ts, and /src/hooks/*. Review the existing lint, typecheck, and test commands before planning the CI and pre-commit work. Done means PRs and pushes run checks, core utilities have coverage, ErrorBoundary tracking is present, and security headers are configured; the issue is already assigned.

Escrita pelo modelo de indexação a partir do texto da issue.