feat: add Proaktiv and KI Chat tabs to AI sidebar

frontend/src/components/layout/AppShell.tsx

@@ -4,14 +4,11 @@ import { Sidebar } from './Sidebar';
 import { TopBar } from './TopBar';
 import { PluginToolbar } from './PluginToolbar';
 import { AISidebar } from './AISidebar';
-import { SuggestionSidebar } from '@/components/ai/SuggestionSidebar';
 import { ToastContainer } from '@/components/ui/Toast';
-import { useUIStore } from '@/store/uiStore';
 import { useAIContext } from '@/hooks/useAIContext';
 
 export function AppShell() {
   const location = useLocation();
-  const { suggestionSidebarOpen, toggleSuggestionSidebar } = useUIStore();
 
   // Track context for AI Proactive suggestions
   useAIContext();
@@ -39,11 +36,6 @@ export function AppShell() {
       </div>
       {/* AI Sidebar — full height, right of TopBar and Toolbar */}
       {showAISidebar && <AISidebar />}
-      {/* Suggestion Sidebar — overlays from right */}
-      <SuggestionSidebar
-        isOpen={suggestionSidebarOpen}
-        onClose={() => toggleSuggestionSidebar()}
-      />
       <ToastContainer />
     </div>
   );