Add global live feed for task comments

frontend/src/components/organisms/DashboardSidebar.tsx

@@ -2,7 +2,7 @@
 
 import Link from "next/link";
 import { usePathname } from "next/navigation";
-import { BarChart3, Bot, LayoutGrid, Network } from "lucide-react";
+import { Activity, BarChart3, Bot, LayoutGrid, Network } from "lucide-react";
 
 import { ApiError } from "@/api/mutator";
 import {
@@ -81,6 +81,18 @@ export function DashboardSidebar() {
             <LayoutGrid className="h-4 w-4" />
             Boards
           </Link>
+          <Link
+            href="/activity"
+            className={cn(
+              "flex items-center gap-3 rounded-lg px-3 py-2.5 text-slate-700 transition",
+              pathname.startsWith("/activity")
+                ? "bg-blue-100 text-blue-800 font-medium"
+                : "hover:bg-slate-100"
+            )}
+          >
+            <Activity className="h-4 w-4" />
+            Live feed
+          </Link>
           <Link
             href="/agents"
             className={cn(