style(TemplateTree): 优化树形组件样式和配置

调整树形组件的滚动行为和显示样式，增加分隔线和紧凑模式

src/renderer/components/TemplateTree.vue

@@ -3,15 +3,18 @@
     variant="outlined"
     class="pa-2"
     :height="height"
+    style="overflow: auto;"
   >
     <v-treeview
       open-all
       :items="items"
       item-title="name"
-      item-key="id"
+      item-value="id"
-      item-children="children"
       open-on-click
       :hoverable="true"
+      :indent-lines="'default'"
+      separate-roots
+      density="compact"
     >
       <template #prepend="{ item }">
         <v-icon