refactor(webui): improve visual consistency (#5249)

webui/src/components/thread/ThreadComposer.tsx

@@ -52,6 +52,7 @@ import { useTranslation } from "react-i18next";
 import { Button } from "@/components/ui/button";
 import {
   floatingItemClassName,
+  floatingSurfaceElevationClassName,
   floatingSurfaceVisualClassName,
 } from "@/components/ui/floating-surface";
 import {
@@ -805,8 +806,8 @@ function RunElapsedStrip({
           tabIndex={-1}
           className={cn(
             "absolute bottom-[calc(100%+8px)] left-3 right-3 z-[50] flex max-w-none flex-col overflow-hidden",
-            "rounded-2xl border border-black/[0.08] bg-card shadow-[0_12px_40px_rgba(15,23,42,0.14)]",
-            "backdrop-blur-sm dark:border-white/[0.1] dark:shadow-[0_16px_48px_rgba(0,0,0,0.45)]",
+            "rounded-2xl",
+            floatingSurfaceElevationClassName,
           )}
           style={{ maxHeight: `${Math.round(panelMaxPx)}px` }}
         >