Release 0.4.0

What's Changed

• feat(compat): Laravel 13 and Livewire 4 support by @digitalelvis in #26
• feat(usage): cost estimation for LLM spans and runs by @digitalelvis in #27
• release: v0.4.0 by @digitalelvis in #28

Full Changelog: v0.3.3...v0.4.0