Show agent profile card with description when hover on agent in chat view

- Create profile card componennt. Use it for agent profile card
- Pass agent persona from khoj server via API
- Put link to agent profile page in the hover card to make it 2 clicks
  away. Othewise inadvertent clicks on agent in chat view lead away to
  agent page
- Use tailwind line-clamp extension to clamp card to first two lines

src/interface/web/app/components/chatMessage/chatMessage.tsx

@@ -76,6 +76,7 @@ interface AgentData {
     name: string;
     avatar: string;
     slug: string;
+    persona: string;
 }
 
 interface Intent {