fix: remove tenant switcher from TopBar, fix aiProactive API double-prefix

- Remove tenant switcher dropdown from TopBar (cleanup unused vars/imports)
- Fix aiProactive.ts: remove /api/v1 prefix from apiClient calls (baseURL already includes it)
- This fixes 404 errors on /api/v1/api/v1/ai-proactive/suggestions

frontend/src/api/aiProactive.ts

@@ -21,7 +21,7 @@ export function useSuggestions() {
 
   useEffect(() => {
     // Initial load
-    apiClient.get('/api/v1/ai-proactive/suggestions').then(r => {
+    apiClient.get('/ai-proactive/suggestions').then(r => {
       setSuggestions(r.data.items);
     }).catch(() => {});
 
@@ -41,11 +41,11 @@ export function useSuggestions() {
 
   const dismiss = useCallback(async (id: string) => {
     setSuggestions(prev => prev.filter(s => s.id !== id));
-    await apiClient.post(`/api/v1/ai-proactive/suggestions/${id}/dismiss`).catch(() => {});
+    await apiClient.post(`/ai-proactive/suggestions/${id}/dismiss`).catch(() => {});
   }, []);
 
   const act = useCallback(async (id: string, actionIndex: number) => {
-    const result = await apiClient.post(`/api/v1/ai-proactive/suggestions/${id}/act`, {
+    const result = await apiClient.post(`/ai-proactive/suggestions/${id}/act`, {
       action_index: actionIndex
     });
     setSuggestions(prev => prev.map(s => s.id === id ? { ...s, is_acted_upon: true } : s));
@@ -59,11 +59,11 @@ export function useProactiveSettings() {
   const [settings, setSettings] = useState<any>(null);
 
   useEffect(() => {
-    apiClient.get('/api/v1/ai-proactive/settings').then(r => setSettings(r.data));
+    apiClient.get('/ai-proactive/settings').then(r => setSettings(r.data));
   }, []);
 
   const update = useCallback(async (updates: any) => {
-    const r = await apiClient.put('/api/v1/ai-proactive/settings', updates);
+    const r = await apiClient.put('/ai-proactive/settings', updates);
     setSettings(r.data);
     return r.data;
   }, []);

frontend/src/components/layout/TopBar.tsx

@@ -4,7 +4,6 @@ import { useNavigate } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { useAuthStore } from '@/store/authStore';
 import { useUIStore } from '@/store/uiStore';
-import { useTenant } from '@/hooks/useTenant';
 import { useLogout } from '@/api/hooks';
 import { Avatar } from '@/components/ui/Avatar';
 import { Badge } from '@/components/ui/Badge';
@@ -16,19 +15,15 @@ export function TopBar() {
   const navigate = useNavigate();
   const { user } = useAuthStore();
   const { toggleSidebar, openAISidebarProactive } = useUIStore();
-  const { currentTenant, availableTenants, switchTenant, isSwitching } = useTenant();
   const logoutMutation = useLogout();
 
-  const [tenantMenuOpen, setTenantMenuOpen] = useState(false);
   const [userMenuOpen, setUserMenuOpen] = useState(false);
   const [notifOpen, setNotifOpen] = useState(false);
-  const tenantRef = useRef<HTMLDivElement>(null);
   const userRef = useRef<HTMLDivElement>(null);
   const notifRef = useRef<HTMLDivElement>(null);
 
   useEffect(() => {
     const handleClickOutside = (e: MouseEvent) => {
-      if (tenantRef.current && !tenantRef.current.contains(e.target as Node)) setTenantMenuOpen(false);
       if (userRef.current && !userRef.current.contains(e.target as Node)) setUserMenuOpen(false);
       if (notifRef.current && !notifRef.current.contains(e.target as Node)) setNotifOpen(false);
     };
@@ -45,11 +40,6 @@ export function TopBar() {
     navigate('/login');
   };
 
-  const handleTenantSwitch = async (tenantId: string) => {
-    await switchTenant(tenantId);
-    setTenantMenuOpen(false);
-  };
-
   const fullName = user ? `${user.first_name} ${user.last_name}` : '';
 
   return (
@@ -70,56 +60,6 @@ export function TopBar() {
           </svg>
         </button>
 
-        {/* Tenant switcher */}
-        <div ref={tenantRef} className="relative">
-          <button
-            onClick={() => setTenantMenuOpen(!tenantMenuOpen)}
-            className="flex items-center gap-2 px-3 py-2 rounded-md hover:bg-secondary-100 min-h-touch focus:outline-none focus-visible:ring-2 focus-visible:ring-primary-500"
-            aria-label={t('topbar.switchTenant')}
-            aria-expanded={tenantMenuOpen}
-            aria-haspopup="listbox"
-          >
-            <svg className="w-4 h-4 text-secondary-500" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
-              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 21V5a2 2 0 00-2-2H7a2 2 0 00-2 2v16m14 0h2m-2 0h-5m-9 0H3m2 0h5M9 7h1m-1 4h1m4-4h1m-1 4h1m-5 10v-5a1 1 0 011-1h2a1 1 0 011 1v5m-4 0h4" />
-            </svg>
-            <span className="text-sm font-medium text-secondary-700 max-w-32 truncate">
-              {currentTenant?.name || t('topbar.tenant')}
-            </span>
-            <svg className="w-4 h-4 text-secondary-400" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
-              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
-            </svg>
-          </button>
-          {tenantMenuOpen && (
-            <ul
-              className="absolute top-full left-0 mt-1 w-56 bg-white rounded-md shadow-lg border border-secondary-200 py-1 z-50"
-              role="listbox"
-              aria-label={t('topbar.switchTenant')}
-            >
-              {availableTenants.map((tenant) => (
-                <li key={tenant.id}>
-                  <button
-                    onClick={() => handleTenantSwitch(tenant.id)}
-                    className={clsx(
-                      'w-full text-left px-3 py-2 text-sm hover:bg-secondary-50 min-h-touch flex items-center justify-between focus:outline-none focus-visible:ring-2 focus-visible:ring-primary-500',
-                      tenant.id === currentTenant?.id && 'bg-primary-50 text-primary-700'
-                    )}
-                    role="option"
-                    aria-selected={tenant.id === currentTenant?.id}
-                    disabled={isSwitching}
-                  >
-                    {tenant.name}
-                    {tenant.id === currentTenant?.id && (
-                      <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
-                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
-                      </svg>
-                    )}
-                  </button>
-                </li>
-              ))}
-            </ul>
-          )}
-        </div>
-
         {/* Search */}
         <div className="hidden md:block">
           <SearchDropdown placeholder={t('topbar.search')} />