fix: 修复主题按钮闪烁问题

- 将 transition: all 改为 transition: transform, box-shadow, background
- 避免 transition 影响位置属性(top/right)导致闪烁
- 更新 CSS 版本号

static/css/style.css

@@ -268,7 +268,7 @@ h1 {
     color: white;
     font-size: 24px;
     cursor: pointer;
-    transition: all 0.3s ease;
+    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
     box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
     z-index: 100;
     display: flex;
@@ -299,7 +299,7 @@ h1 {
     color: white;
     font-size: 20px;
     cursor: pointer;
-    transition: all 0.3s ease;
+    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
     box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
     display: flex;
     align-items: center;