refactor: improve CallToAction typography and AgentBento mobile layout across pages

- Added leading-normal to all CallToAction description paragraphs for better readability
- Changed AgentBento empty animation placeholder to hidden on mobile using hidden md:flex
- Reduced top margin from mt-8 to mt-6 for agents CallToAction CTA cards
- Changed "Follow Development" link margin from mt-5 to lg:mt-5 mt-0 for responsive spacing
- Applied leading-normal changes to agents, compute, gpu, home, network, nodes

src/pages/agents/AgentBento.tsx

@@ -123,7 +123,7 @@ export function AgentBento() {
                     <div className="w-full h-full object-cover"><card.animation /></div>
                   </div>
                 ) : (
-                  <div className="h-48 w-full flex items-center justify-center bg-transparent" />
+                  <div className="hidden md:flex md:h-48 w-full items-center justify-center bg-transparent" />
                 )}
 
                 <div className="px-8 pt-4 pb-6">