[RAPID-fix] 컬럼 리사이즈 호버 영역을 경계선 기준 좌우 균등하게 조정

- right: 0, width: 5px → right: -3px, width: 7px
- 경계선 기준 좌우 3.5px씩 균등하게 호버 영역 배치

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

WebContent/WEB-INF/view/contractMgmt/estimateAndOrderRegistFormPopup.jsp

@@ -62,9 +62,9 @@
  }
  #itemListTable th .col-resizer {
  	position: absolute;
- 	right: 0;
+ 	right: -3px;
  	top: 0;
- 	width: 5px;
+ 	width: 7px;
  	height: 100%;
  	cursor: col-resize;
  	z-index: 10;

WebContent/WEB-INF/view/contractMgmt/estimateRegistFormPopup.jsp

@@ -62,9 +62,9 @@
  }
  #itemListTable th .col-resizer {
  	position: absolute;
- 	right: 0;
+ 	right: -3px;
  	top: 0;
- 	width: 5px;
+ 	width: 7px;
  	height: 100%;
  	cursor: col-resize;
  	z-index: 10;