fix: eraser 아이콘 Icon 컴포넌트에 등록

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/ui/Icon.tsx

@@ -11,7 +11,7 @@ import {
   MagnifyingGlass, DownloadSimple, CalendarBlank, CalendarCheck, BellRinging, Bell, Sparkle,
   Minus, DotsThree, DotsThreeVertical, Translate, BookOpenText, SkipForward, Info, SignOut, Camera, Crown,
   Export, Gear, ArrowRight, Pause, BookmarkSimple, Code, type IconProps as PhIconProps, type IconWeight,
-  Scales, Feather, Clock, Flag, CheckSquare, Circle, ArrowLeft, User, Books, Medal,
+  Scales, Feather, Clock, Flag, CheckSquare, Circle, ArrowLeft, User, Books, Medal, Eraser,
 } from '@phosphor-icons/react';
 
 // name → component map. 새 아이콘 추가 시 이 맵에만 등록.
@@ -86,6 +86,7 @@ const ICON_MAP = {
   'user': User,
   'books': Books,
   'medal': Medal,
+  'eraser': Eraser,
   'code': Code,
 } as const;