feat(slot blocking): add buttons to sidebar

src/app/(main)/blocker/page.tsx

@@ -22,7 +22,7 @@ export default function BlockedSlots() {
     <div className='relative h-full flex flex-col items-center'>
       {/* Heading */}
       <h1 className='text-3xl font-bold mt-8 mb-4 text-center z-10'>
-        My Blocked Slots
+        My Blockers
       </h1>
 
       {/* Scrollable blocked slot list */}
@@ -40,7 +40,7 @@ export default function BlockedSlots() {
           ) : (
             <div className='flex flex-1 flex-col items-center justify-center min-h-[300px]'>
               <Label size='large' className='justify-center text-center'>
-                You don&#39;t have any blocked slots right now
+                You don&#39;t have any blockers right now
               </Label>
               <RedirectButton
                 redirectUrl='/blocker/new'

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

@@ -14,7 +14,7 @@ import {
   SidebarMenuItem,
 } from '@/components/custom-ui/sidebar';
 
-import { CalendarMinus, CalendarX2, ChevronDown } from 'lucide-react';
+import { CalendarMinus, CalendarMinus2, 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'
               >
-                <CalendarX2 className='size-8' />
+                <CalendarMinus2 className='size-8' />
                 <span className='group-data-[collapsible=icon]:hidden text-nowrap whitespace-nowrap'>
                   New Blocker
                 </span>