feat: 优化过期岗位卡片显示样式

- 过期岗位卡片整体背景变灰，透明度降低至0.8
- 过期岗位的文字颜色变淡，更容易识别状态
- '已过期'按钮改为白底红字带红色边框样式，更加醒目
- 截止时间显示为红色，提醒已过期状态
- 禁用过期岗位的hover效果

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/pages/CompanyJobsPage/components/JobList/index.css

@@ -33,6 +33,47 @@
       background-color: #d9e9ff;
     }
     
+    &.expired {
+      background-color: #f7f8fa;
+      background-image: none;
+      border-color: #e5e6eb;
+      opacity: 0.8;
+      
+      &:hover {
+        border-color: #c9cdd4;
+        box-shadow: none;
+        transform: none;
+        background-color: #f2f3f5;
+      }
+      
+      .company-jobs-info-position {
+        color: #86909c;
+      }
+      
+      .company-jobs-info-tags {
+        opacity: 0.6;
+      }
+      
+      .company-jobs-info-position-count {
+        color: #c9cdd4;
+      }
+      
+      .company-jobs-info-position-salary {
+        color: #c9cdd4;
+      }
+      
+      .company-jobs-info-deadline {
+        color: #ff4d4f;
+        font-weight: 600;
+      }
+      
+      .company-jobs-info-category-tag {
+        opacity: 0.7;
+        background-color: #f2f3f5;
+        color: #86909c;
+      }
+    }
+
     .icon {
       position: absolute;
       left: 0;
@@ -171,19 +212,21 @@
         }
         
         &.disabled {
-          background-color: #f2f3f5;
-          color: #c9cdd4;
+          background-color: #fff;
+          color: #ff4d4f;
+          border: 1px solid #ffccc7;
           cursor: not-allowed;
           pointer-events: none;
+          font-weight: 600;
           
           &:hover {
-            background-color: #f2f3f5;
+            background-color: #fff;
             box-shadow: none;
             transform: none;
           }
           
           > i {
-            opacity: 0.5;
+            display: none;
           }
         }
       }

src/pages/CompanyJobsPage/components/JobList/index.jsx

@@ -117,7 +117,7 @@ export default ({ className = "", data = [], backgroundColor }) => {
           return (
             <li
               key={item.id}
-              className="company-jobs-page-left-list-item"
+              className={`company-jobs-page-left-list-item ${(item.isExpired || item.status === 'expired') ? 'expired' : ''}`}
               style={{ backgroundColor }}
               onClick={(e) => handleJobClick(e, item)}
             >