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/knowledge/EntryCard.tsx

@@ -1,4 +1,5 @@
 /* eslint-disable @typescript-eslint/no-unnecessary-condition */
+import React from "react";
 import type { KnowledgeEntryWithTags } from "@mosaic/shared";
 import { EntryStatus } from "@mosaic/shared";
 import Link from "next/link";
@@ -32,7 +33,9 @@ const visibilityIcons = {
   PUBLIC: <Eye className="w-3 h-3" />,
 };
 
-export function EntryCard({ entry }: EntryCardProps): React.JSX.Element {
+export const EntryCard = React.memo(function EntryCard({
+  entry,
+}: EntryCardProps): React.JSX.Element {
   const statusInfo = statusConfig[entry.status];
   const visibilityIcon = visibilityIcons[entry.visibility];
 
@@ -107,4 +110,4 @@ export function EntryCard({ entry }: EntryCardProps): React.JSX.Element {
       </div>
     </Link>
   );
-}
+});