fix(ui): update halo image version and enhance header styles with animations

src/styles/header.scss

@@ -13,10 +13,95 @@
 
   .dividing {
     flex: 1;
-    background: repeating-linear-gradient(90deg, var(--foreground), var(--foreground) 2px, transparent 0, transparent 10px);
     display: block;
     width: 100%;
     height: 25px;
+    position: relative;
+
+    // 虚线背景层 - 带遮罩
+    &::before {
+      content: '';
+      position: absolute;
+      top: 0;
+      left: 0;
+      width: 100%;
+      height: 100%;
+      background: repeating-linear-gradient(
+                      90deg,
+                      var(--foreground),
+                      var(--foreground) 2px,
+                      transparent 0,
+                      transparent 10px
+      );
+      background-size: 10px 100%;
+      animation: line-flow 3s linear infinite;
+
+      // 遮罩层实现虚线淡入淡出效果
+      mask-image: linear-gradient(
+                      90deg,
+                      transparent 0%,
+                      black 3%,
+                      black 97%,
+                      transparent 100%
+      );
+      -webkit-mask-image: linear-gradient(
+                      90deg,
+                      transparent 0%,
+                      black 3%,
+                      black 97%,
+                      transparent 100%
+      );
+    }
+
+    // 扫描光效 - 模拟终端扫描线
+    &::after {
+      content: '';
+      position: absolute;
+      left: -30%;
+      top: 50%;
+      transform: translateY(-50%);
+      width: 30%;
+      height: 120%;
+      filter: blur(4px);
+      background: linear-gradient(
+                      90deg,
+                      transparent 0%,
+                      var(--green) 80%,
+                      transparent 100%
+      );
+      opacity: 0.3;
+      animation: scan-line 5s ease-in-out infinite;
+      pointer-events: none;
+      z-index: 10;
+    }
+  }
+
+  // 虚线流动动画 - 模拟加载进度
+  @keyframes line-flow {
+    0% {
+      background-position: 0 0;
+    }
+    100% {
+      background-position: 10px 0;
+    }
+  }
+
+  // 扫描线动画 - 模拟终端扫描效果
+  @keyframes scan-line {
+    0% {
+      left: -20%;
+      opacity: 0;
+    }
+    30% {
+      opacity: .3;
+    }
+    70% {
+      opacity: .3;
+    }
+    100% {
+      left: 80%;
+      opacity: 0;
+    }
   }
 
   .menu {