fix(navbar): resolve 404 header badge collision, integrate theme toggle, and pass anti-slop audit

fix(ui): expand hero preview thumbnails to fill the frame edge-to-edge

feat: implement real before/after preview, Neubrutalism UI redesign, production readiness fixes, and update README

feat(frontend): refactor UI to clean anti-slop minimalist design with dual theme and image inspection

feat: optimize UI, SEO metadata for Google Search Console, and add reprocess fallback models

feat: implement frontend web application with background removal and Turnstile verification support

feat: add Next.js frontend for Vercel + enable Gradio API on HuggingFace