fix(ui): refine layout polish

src/i18n/locales/en.ts

@@ -793,7 +793,6 @@ export default {
     theme: "Theme",
     selectTheme: "Select theme...",
     appLayout: "Interface Layout",
-    appLayoutDescription: "Choose the main panel spacing, tab style, and header density.",
     appLayoutSeparated: "Modern separated",
     appLayoutSeparatedDescription: "Clear panel separation with block-style tabs.",
     appLayoutClassic: "Classic compact",

src/i18n/locales/zh-CN.ts

@@ -780,7 +780,6 @@ export default {
     theme: "主题",
     selectTheme: "选择主题...",
     appLayout: "界面布局",
-    appLayoutDescription: "选择主界面的面板分隔、标签页和标题栏样式。",
     appLayoutSeparated: "现代分隔",
     appLayoutSeparatedDescription: "面板分隔更清晰，标签页为块状样式。",
     appLayoutClassic: "经典紧凑",