项目总览界面UI美化与入组数据统计修复

- 重构总览页面布局：卡片化设计、顶部标题栏、图标装饰
- 美化进度时间线：hover高亮、呼吸动画、渐变连接线
- 重写入组图表：去除边框、虚线网格、渐变柱子、柔和背景
- 修复入组统计：同时匹配enrollment_date和ENROLLED状态
- 移除adapter中hasEnrollmentStage过滤，显示真实入组数

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/views/admin/ProjectDetail.vue

@@ -7099,30 +7099,31 @@ onBeforeUnmount(() => {
 .setup-content-step-nav {
   display: flex;
   align-items: center;
-  gap: 8px;
+  gap: 6px;
 }
 
 .setup-content-step-nav :deep(.el-button.is-circle) {
-  width: 28px;
-  height: 28px;
+  width: 32px;
+  height: 32px;
   padding: 0;
-  background: transparent !important;
-  border: 1px solid #e2e8f0 !important;
-  color: #64748b !important;
+  background: #f1f5f9 !important;
+  border: 1.5px solid #cbd5e1 !important;
+  color: #475569 !important;
+  font-size: 14px;
   transition: all 0.2s;
 }
 
 .setup-content-step-nav :deep(.el-button.is-circle:hover) {
-  background: #f8fafc !important;
-  border-color: #cbd5e1 !important;
-  color: #3b82f6 !important;
+  background: #e2e8f0 !important;
+  border-color: #94a3b8 !important;
+  color: #1e40af !important;
 }
 
 .setup-content-step-nav :deep(.el-button.is-circle.is-disabled),
 .setup-content-step-nav :deep(.el-button.is-circle.is-disabled:hover) {
-  background: transparent !important;
-  border-color: #f1f5f9 !important;
-  color: #e2e8f0 !important;
+  background: #f8fafc !important;
+  border-color: #e2e8f0 !important;
+  color: #cbd5e1 !important;
   cursor: not-allowed;
 }