refactor: standardize Tailwind class syntax and component usage

- Replaced arbitrary CSS values with standard Tailwind utilities (e.g., `bottom-[-18rem]` → `-bottom-72`, `mt-[-2rem]` → `-mt-8`)
- Fixed invalid gradient syntax by removing `bg-` prefix from gradient utilities
- Consolidated text styling by replacing inline elements with CT/CP text components
- Adjusted CT component typography from semibold to medium for better visual hierarchy

src/pages/agents/GallerySection.tsx

@@ -136,7 +136,7 @@ export function GallerySection() {
           </div>
 
           {/* Foreground pill (Desktop) */}
-          <div className="absolute left-1/2 top-1/2 -translate-x-1/2 -translate-y-1/2 z-[60] hidden md:block">
+          <div className="absolute left-1/2 top-1/2 -translate-x-1/2 -translate-y-1/2 z-60 hidden md:block">
             <div className="flex items-center justify-between w-[1040px] gap-6 rounded-2xl bg-gray-100/80 shadow-[0_8px_40px_rgba(0,0,0,0.15)] px-12 backdrop-blur">
               <CP as="h4" className="max-w-[820px] h-[72px] flex items-center" color="dark">
                 <TypeAnimation