feat: global AI assistant floating button for supervisors (#578)

- AiFloatingButton: FAB (bottom-right) opens a slide-in drawer with
  the supervisor AI chat panel. Close button collapses drawer, FAB
  reappears. Chat state persists across open/close and page navigation.
- app-shell: mounts FAB for admin users (isAdmin), same pattern as
  CallWidget for agents.
- team-dashboard: removed inline AI panel + toggle button — replaced
  by the global FAB. Dashboard content reclaims the full width.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/layout/app-shell.tsx

@@ -15,6 +15,7 @@ import { useData } from '@/providers/data-provider';
 import { useMaintShortcuts } from '@/hooks/use-maint-shortcuts';
 import { useNetworkStatus } from '@/hooks/use-network-status';
 // import { GlobalSearch } from '@/components/shared/global-search';
+import { AiFloatingButton } from '@/components/shared/ai-floating-button';
 import { apiClient } from '@/lib/api-client';
 import { cx } from '@/utils/cx';
 
@@ -24,7 +25,7 @@ interface AppShellProps {
 
 export const AppShell = ({ children }: AppShellProps) => {
     const { pathname } = useLocation();
-    const { isCCAgent } = useAuth();
+    const { isCCAgent, isAdmin } = useAuth();
     const { isOpen, activeAction, close } = useMaintShortcuts();
     const { connectionStatus, isRegistered } = useSip();
     const networkQuality = useNetworkStatus();
@@ -143,6 +144,7 @@ export const AppShell = ({ children }: AppShellProps) => {
                     <main className="flex flex-1 flex-col overflow-hidden">{children}</main>
                 </div>
                 {isCCAgent && pathname !== '/' && pathname !== '/call-desk' && <CallWidget />}
+                {isAdmin && <AiFloatingButton />}
             </div>
             <MaintOtpModal
                 isOpen={isOpen}

src/components/shared/ai-floating-button.tsx

@@ -0,0 +1,50 @@
+import { useState } from 'react';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faSparkles, faXmark } from '@fortawesome/pro-duotone-svg-icons';
+import { AiChatPanel } from '@/components/call-desk/ai-chat-panel';
+import { cx } from '@/utils/cx';
+
+export const AiFloatingButton = () => {
+    const [open, setOpen] = useState(false);
+
+    return (
+        <>
+            {/* FAB — bottom right, hidden when drawer is open */}
+            {!open && (
+                <button
+                    onClick={() => setOpen(true)}
+                    className="fixed bottom-6 right-6 z-50 flex size-12 items-center justify-center rounded-full bg-brand-solid text-white shadow-lg hover:bg-brand-solid_hover transition duration-100 ease-linear"
+                    title="AI Assistant"
+                >
+                    <FontAwesomeIcon icon={faSparkles} className="size-5" />
+                </button>
+            )}
+
+            {/* Drawer — slides in from right */}
+            <div className={cx(
+                'fixed top-0 right-0 z-50 h-full bg-primary border-l border-secondary shadow-xl transition-all duration-200 ease-linear flex flex-col',
+                open ? 'w-[400px]' : 'w-0 overflow-hidden border-l-0',
+            )}>
+                {open && (
+                    <>
+                        <div className="flex shrink-0 items-center justify-between border-b border-secondary px-4 py-3">
+                            <div className="flex items-center gap-2">
+                                <FontAwesomeIcon icon={faSparkles} className="size-3.5 text-fg-brand-primary" />
+                                <span className="text-sm font-semibold text-primary">AI Assistant</span>
+                            </div>
+                            <button
+                                onClick={() => setOpen(false)}
+                                className="flex size-7 items-center justify-center rounded-lg text-fg-quaternary hover:text-fg-secondary hover:bg-primary_hover transition duration-100 ease-linear"
+                            >
+                                <FontAwesomeIcon icon={faXmark} className="size-4" />
+                            </button>
+                        </div>
+                        <div className="flex-1 min-h-0 overflow-hidden">
+                            <AiChatPanel callerContext={{ type: 'supervisor' }} />
+                        </div>
+                    </>
+                )}
+            </div>
+        </>
+    );
+};

src/pages/team-dashboard.tsx

@@ -1,8 +1,5 @@
 import { useMemo, useState } from 'react';
-import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
-import { faSidebarFlip, faSidebar } from '@fortawesome/pro-duotone-svg-icons';
 import { PageHeader } from '@/components/layout/page-header';
-import { AiChatPanel } from '@/components/call-desk/ai-chat-panel';
 import { DashboardKpi } from '@/components/dashboard/kpi-cards';
 import { MissedQueue } from '@/components/dashboard/missed-queue';
 import {
@@ -29,7 +26,6 @@ const getDateRangeStart = (range: DateRange): Date => {
 export const TeamDashboardPage = () => {
     const { calls, leads, campaigns, loading } = useData();
     const [dateRange, setDateRange] = useState<DateRange>('week');
-    const [aiOpen, setAiOpen] = useState(true);
 
     // Pull the richer supervisor rollup (NPS, idle, time breakdown, alerts)
     // from the sidecar. Only `today`/`week`/`month` overlap with the rollup's
@@ -61,7 +57,6 @@ export const TeamDashboardPage = () => {
                 subtitle={dateRangeLabel}
                 infoText="Aggregated call metrics, agent performance, and operational alerts."
                 controls={
-                    <>
                     <div className="flex rounded-lg border border-secondary overflow-hidden">
                         {(['today', 'week', 'month'] as const).map((range) => (
                             <button
@@ -76,14 +71,6 @@ export const TeamDashboardPage = () => {
                             </button>
                         ))}
                     </div>
-                        <button
-                            onClick={() => setAiOpen(!aiOpen)}
-                            className="flex size-8 items-center justify-center rounded-lg text-fg-quaternary hover:text-fg-secondary hover:bg-primary_hover transition duration-100 ease-linear"
-                            title={aiOpen ? 'Hide AI panel' : 'Show AI panel'}
-                        >
-                            <FontAwesomeIcon icon={aiOpen ? faSidebarFlip : faSidebar} className="size-4" />
-                        </button>
-                    </>
                 }
             />
 
@@ -154,17 +141,6 @@ export const TeamDashboardPage = () => {
                     </div>
                 </div>
 
-                {/* AI panel — collapsible */}
-                <div className={cx(
-                    "shrink-0 border-l border-secondary bg-primary flex flex-col overflow-hidden transition-all duration-200 ease-linear",
-                    aiOpen ? "w-[380px]" : "w-0 border-l-0",
-                )}>
-                    {aiOpen && (
-                        <div className="flex h-full flex-col p-4">
-                            <AiChatPanel callerContext={{ type: 'supervisor' }} />
-                        </div>
-                    )}
-                </div>
             </div>
 
         </div>