fix(calendar): expose proposal context to screen readers

frontend/src/components/calendar/CalendarSidebarLeft.tsx

@@ -1,5 +1,3 @@
-import { Plus } from 'lucide-react';
-import { Button } from '@/components/ui/button';
 import { calendarDefinitions } from './constants';
 
 type Props = {
@@ -10,9 +8,7 @@ type Props = {
 export function CalendarSidebarLeft({ calendarVisibility, toggleCalendarVisibility }: Props) {
   return (
     <aside className="w-64 shrink-0 flex-col overflow-y-auto border-r border-border bg-card p-4 hidden lg:flex">
-      <Button type="button" className="h-10 w-full">
-        <Plus className="size-4" aria-hidden="true" />새 일정
-      </Button>
+
 
       <div className="mt-8">
         <div className="mb-4 flex items-center justify-between">
@@ -35,9 +31,7 @@ export function CalendarSidebarLeft({ calendarVisibility, toggleCalendarVisibili
             </li>
           ))}
         </ul>
-        <Button type="button" variant="ghost" className="mt-4 w-full justify-start text-primary hover:text-primary">
-          <Plus className="size-4" aria-hidden="true" /> 캘린더 추가
-        </Button>
+
       </div>
     </aside>
   );