feat: add AgentPro section and refactor AgentUsecase layout

- Created AgentPro component highlighting local execution, mesh connectivity, private data access, and portability advantages
- Replaced horizontal scrolling carousel in AgentUsecase with responsive grid layout
- Added "Blend local + remote intelligence" use case to AgentUsecase
- Removed slider navigation buttons and replaced with static grid display
- Replaced AgentDesign with AgentPro in AgentsPage component order
- Increased hero section padding on

src/pages/agents/AgentHeroAlt.tsx

@@ -12,7 +12,7 @@ export function AgentHeroAlt() {
         style={{ backgroundImage: "url('/images/agents.webp')", backgroundSize: "contain" }}
       >
         {/* Inner padding */}
-        <div className="px-6 py-16 lg:py-16">
+        <div className="px-6 py-16 lg:py-24">
           <div className="max-w-2xl lg:pl-6">
             <Eyebrow>MYCELIUM AGENTS - COMING IN 2026</Eyebrow>
             <H3 as="h1" className="mt-4">