fix(project): 달력 드래그를 포인터 기반으로 재구현

HTML5 네이티브 DnD 가 절대배치 grid 오버레이 달력에서 dragstart 를 잡지
못해(콘솔 에러 없이 무동작) 드래그가 안 됐다. mousedown→mousemove→mouseup
포인터 기반으로 직접 구현:
- 5px 이상 움직이면 드래그 시작, 고스트 라벨이 커서 따라다님
- 드래그 중 bar pointer-events 해제 → elementFromPoint 가 날짜 셀 반환
- 놓은 칸의 날짜로 기간 유지 이동, 안 움직이면 클릭=모달
- 네이티브 draggable 속성 제거

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/modules/project/templates/project/inbox.html

@@ -1,7 +1,7 @@
 {% extends "erp_base.html" %}
 
 {% block head_extra %}
-<link rel="stylesheet" href="/static/project.css?v=20260625g" />
+<link rel="stylesheet" href="/static/project.css?v=20260625h" />
 <link rel="stylesheet" href="/static/vendor/material-symbols/material-symbols.css" />
 {% endblock %}
 
@@ -45,5 +45,5 @@
   {% endif %}
 </div>
 
-<script src="/static/project.js?v=20260625g" defer></script>
+<script src="/static/project.js?v=20260625h" defer></script>
 {% endblock %}

app/modules/project/templates/project/index.html

@@ -1,7 +1,7 @@
 {% extends "erp_base.html" %}
 
 {% block head_extra %}
-<link rel="stylesheet" href="/static/project.css?v=20260625g" />
+<link rel="stylesheet" href="/static/project.css?v=20260625h" />
 <link rel="stylesheet" href="/static/vendor/material-symbols/material-symbols.css" />
 {% endblock %}
 
@@ -101,5 +101,5 @@
 <script>
   window.PJ_COLORS = {{ ["#4573d2","#37a3a3","#62a420","#e8a33d","#e8384f","#aa62e3","#f06a6a","#5a6772"] | tojson }};
 </script>
-<script src="/static/project.js?v=20260625g" defer></script>
+<script src="/static/project.js?v=20260625h" defer></script>
 {% endblock %}

app/modules/project/templates/project/project.html

@@ -1,7 +1,7 @@
 {% extends "erp_base.html" %}
 
 {% block head_extra %}
-<link rel="stylesheet" href="/static/project.css?v=20260625g" />
+<link rel="stylesheet" href="/static/project.css?v=20260625h" />
 <!-- 구글 머티리얼 심볼(담당자 아이콘 등) — self-host -->
 <link rel="stylesheet" href="/static/vendor/material-symbols/material-symbols.css" />
 <!-- 타임라인 vis-timeline — self-host -->
@@ -119,7 +119,6 @@
                         {% if bar.continues_left %}pj-bar-l{% endif %}
                         {% if bar.continues_right %}pj-bar-r{% endif %}"
                  data-task-id="{{ bar.id }}"
-                 {% if can_manage %}draggable="true"{% endif %}
                  style="grid-column: {{ bar.start_col + 1 }} / span {{ bar.span }}; grid-row: {{ bar.lane + 1 }};
                         background: {% if bar.completed %}#9aa5b1{% else %}{{ bar.color }}{% endif %};"
                  title="{{ bar.label }}">
@@ -257,5 +256,5 @@
 </script>
 
 <script src="/static/vendor/vis-timeline/vis-timeline-graph2d.min.js"></script>
-<script src="/static/project.js?v=20260625g" defer></script>
+<script src="/static/project.js?v=20260625h" defer></script>
 {% endblock %}