fix(CQ-WEB-8): Add React.memo to performance-sensitive components

Wrap 7 list-item/card components with React.memo to prevent unnecessary
re-renders when parent components update but props remain unchanged:
- TaskItem (task lists)
- EventCard (calendar views)
- EntryCard (knowledge base)
- WorkspaceCard (workspace list)
- TeamCard (team list)
- DomainItem (domain list)
- ConnectionCard (federation connections)

All are pure components rendered inside .map() loops that depend solely
on their props for rendering output.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/federation/ConnectionCard.tsx

@@ -3,6 +3,7 @@
  * Displays a single federation connection with PDA-friendly design
  */
 
+import React from "react";
 import { FederationConnectionStatus, type ConnectionDetails } from "@/lib/api/federation";
 
 interface ConnectionCardProps {
@@ -50,7 +51,7 @@ function getStatusDisplay(status: FederationConnectionStatus): {
   }
 }
 
-export function ConnectionCard({
+export const ConnectionCard = React.memo(function ConnectionCard({
   connection,
   onAccept,
   onReject,
@@ -149,4 +150,4 @@ export function ConnectionCard({
       )}
     </div>
   );
-}
+});