Remove unused imports in UnifiedSidebar.tsx

- Remove unused Button import from @object-ui/components
- Remove unused Plus and Grid3x3 imports from lucide-react
- Fixes TypeScript TS6133 errors in CI build

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Claude

apps/console/src/components/UnifiedSidebar.tsx

@@ -40,11 +40,9 @@ import {
   AvatarImage,
   AvatarFallback,
   useSidebar,
-  Button,
 } from '@object-ui/components';
 import {
   ChevronsUpDown,
-  Plus,
   Settings,
   LogOut,
   Database,
@@ -55,7 +53,6 @@ import {
   Pencil,
   ChevronRight,
   Home,
-  Grid3x3,
   HelpCircle,
   ArrowLeft,
   Layers,