feat(dashboard): merge Team Performance surfaces into single scrollable view

QA flagged Team Dashboard vs Team Performance as repetitive. Retire Team Performance from the sidebar; move its unique surfaces (rich agent table, time breakdown, NPS/Conversion, Performance Alerts) into Team Dashboard below the existing KPI row.

- supervisor-rollup: new shared module — useSupervisorRollup hook +
  RichAgentTable / TimeBreakdown / NpsConversion / PerformanceAlerts
- Time Breakdown rendered as a table (Agent / Active / Wrap / Idle
  / Break / Total + Team-average header row) — QA flagged the old
  stacked-bar tiles as misleading because per-agent totals varied
  wildly and width comparison was meaningless
- team-dashboard: tabs replaced with stacked sections; everything
  scroll-visible so supervisors don't hunt across surfaces
- sidebar: remove 'Team Performance' entry (route kept for backup)
  and drop the now-unused IconChartLine wiring

src/components/layout/sidebar.tsx

@@ -15,7 +15,6 @@ import {
     faUsers,
     faArrowRightFromBracket,
     faTowerBroadcast,
-    faChartLine,
     faFileAudio,
     faPhoneMissed,
 } from "@fortawesome/pro-duotone-svg-icons";
@@ -30,6 +29,7 @@ import { NavItemBase } from "@/components/application/app-navigation/base-compon
 import type { NavItemType } from "@/components/application/app-navigation/config";
 import { Avatar } from "@/components/base/avatar/avatar";
 import { useAuth } from "@/providers/auth-provider";
+import { useUiFlags } from "@/hooks/use-ui-flags";
 import { useAgentState } from "@/hooks/use-agent-state";
 import { useThemeTokens } from "@/providers/theme-token-provider";
 import { sidebarCollapsedAtom } from "@/state/sidebar-state";
@@ -49,7 +49,6 @@ const IconUsers = faIcon(faUsers);
 const IconHospitalUser = faIcon(faHospitalUser);
 const IconCalendarCheck = faIcon(faCalendarCheck);
 const IconTowerBroadcast = faIcon(faTowerBroadcast);
-const IconChartLine = faIcon(faChartLine);
 const IconFileAudio = faIcon(faFileAudio);
 const IconPhoneMissed = faIcon(faPhoneMissed);
 
@@ -62,8 +61,11 @@ const getNavSections = (role: string): NavSection[] => {
     if (role === 'admin') {
         return [
             { label: 'Supervisor', items: [
+                // Team Performance retired as a nav entry — its surfaces
+                // (time breakdown, NPS/conversion, alerts, richer agent
+                // table) are now rolled into the Dashboard. The route is
+                // kept alive for reference but not linked in the sidebar.
                 { label: 'Dashboard', href: '/', icon: IconGrid2 },
-                { label: 'Team Performance', href: '/team-performance', icon: IconChartLine },
                 { label: 'Live Call Monitor', href: '/live-monitor', icon: IconTowerBroadcast },
             ]},
             { label: 'Data & Reports', items: [
@@ -149,7 +151,16 @@ export const Sidebar = ({ activeUrl = "/" }: SidebarProps) => {
         navigate('/login');
     };
 
-    const navSections = getNavSections(user.role);
+    const uiFlags = useUiFlags();
+    const navSections = getNavSections(user.role).map((section) => ({
+        ...section,
+        items: uiFlags.setupManaged
+            // When setup is managed by the product team (per-tenant flag),
+            // hide the Settings entry from the nav. The route is also
+            // blocked in router-provider so a stray bookmark doesn't work.
+            ? section.items.filter((item) => item.href !== '/settings')
+            : section.items,
+    })).filter((section) => section.items.length > 0);
 
     const content = (
         <aside