refactor(frontend): 优化公共组件和布局组件

- 更新 Logo 相关组件 (AetherLogo, HeaderLogo, RippleLogo 等)
- 优化图表组件 (BarChart, LineChart, ScatterChart)
- 改进公共组件 (AlertDialog, EmptyState, LoadingState)
- 调整布局组件 (AppShell, SidebarNav, PageHeader 等)
- 优化 ActivityHeatmap 统计组件

frontend/src/components/layout/AppShell.vue

@@ -1,5 +1,8 @@
 <template>
-  <div class="app-shell" :class="{ 'pt-24': showNotice }">
+  <div
+    class="app-shell"
+    :class="{ 'pt-24': showNotice }"
+  >
     <div
       v-if="showNotice"
       class="fixed top-6 left-0 right-0 z-50 flex justify-center px-4"
@@ -8,8 +11,8 @@
     </div>
 
     <div class="app-shell__backdrop">
-      <div class="app-shell__gradient app-shell__gradient--primary"></div>
-      <div class="app-shell__gradient app-shell__gradient--accent"></div>
+      <div class="app-shell__gradient app-shell__gradient--primary" />
+      <div class="app-shell__gradient app-shell__gradient--accent" />
     </div>
 
     <div class="app-shell__body">
@@ -21,7 +24,10 @@
         <slot name="sidebar" />
       </aside>
 
-      <div class="app-shell__content" :class="contentClass">
+      <div
+        class="app-shell__content"
+        :class="contentClass"
+      >
         <slot name="header" />
         <main :class="mainClass">
           <slot />