feat(slot blocking): add buttons to sidebar

src/components/custom-ui/app-sidebar.tsx

@@ -14,7 +14,7 @@ import {
   SidebarMenuItem,
 } from '@/components/custom-ui/sidebar';
 
-import { CalendarMinus, ChevronDown } from 'lucide-react';
+import { CalendarMinus, CalendarX2, ChevronDown } from 'lucide-react';
 import {
   Collapsible,
   CollapsibleContent,
@@ -133,7 +133,7 @@ export function AppSidebar() {
                 href='/blocker/new'
                 className='flex items-center gap-2 text-xl font-label'
               >
-                <CalendarPlus className='size-8' />
+                <CalendarX2 className='size-8' />
                 <span className='group-data-[collapsible=icon]:hidden text-nowrap whitespace-nowrap'>
                   New Blocker
                 </span>