fix: expand WORKING attention zone by default

The most important section to see at a glance — agents actively working
should not be hidden behind a collapsed toggle.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

packages/web/src/components/AttentionZone.tsx

@@ -50,7 +50,7 @@ const zoneConfig: Record<
     label: "WORKING",
     description: "Agents working normally",
     color: "var(--color-accent-blue)",
-    defaultCollapsed: true,
+    defaultCollapsed: false,
   },
   done: {
     label: "DONE",