Resolve React/Laravel Site Bugs

My production site runs a React + Next.js front end (TypeScript, Tailwind CSS) with a Laravel API, a small Node.js micro-service, and PostgreSQL. Two urgent issues need attention:

1) UI glitches
• On the homepage the menu, sidebar, hero image and button assets don’t render or align correctly—classes look ignored and the layout collapses at some breakpoints.

2) 500 error on save
• Submitting the main form should write to Postgres via Laravel, but the endpoint throws a 500 Internal Server Error instead of returning the success JSON.

I need these bugs fixed, the underlying causes explained, and a clean, commit-ready pull request.

Deliverables
• Updated components / Tailwind classes so the homepage, menu and sidebar display correctly across modern browsers.
• Patched back-end logic (Laravel, possible Node helper) so saving works flawlessly and returns proper responses.
• Brief changelog noting files touched, steps to reproduce before/after, and any migrations or package installs required.

Repo access and DB credentials are ready—tell me when you can start and your estimated turnaround.