style(components): 调整浮动面板的z-index并移除body.vue中多余的元素

移除body.vue中未使用的概览栏元素，同时调整FloatingPanel的z-index值以避免可能的层叠冲突

src/components/FloatingPanel.vue

@@ -189,12 +189,12 @@ export default {
 <style scoped>
 .fp-root {
   position: fixed;
-  z-index: 9999;
+  z-index: 2000;
   background: #ffffff;
   border: 1px solid #dcdfe6;
   border-radius: 6px;
   box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
-  overflow: hidden;
+  /* overflow: hidden; */
 }
 .fp-header {
   height: 36px;