System Update

### New Logo Our new "Stacked A" mark features a dual-layer geometric design with metallic teal gradients, replacing the previous rainbow-arc logo. The layered depth effect represents the multiple AI providers unified behind a single API. ### What Changed - **Logo**: Geometric Stacked A with Apertis Teal (#2dd4bf → #0d9488) - **Favicon**: Full icon set across 25 sizes (16px–512px) for crisp rendering on every device - **OG Images**: All social preview images updated with new branding - **Loading Animation**: Inline SVG with breathing pulse effect replaces static image spinner - **Header & Footer**: Transparent logo mark with brand name for both light and dark modes ### What Didn't Change Your API keys, endpoints, SDK integrations, and billing — everything works exactly as before. This update is purely visual. **Happy Building.**