feat(ui): 新增文件名截断工具及下拉菜单文本溢出优化

- 新增 truncateMiddle 工具函数，支持中英文混合字符串按视觉宽度截断
- artifact-file-list 和 dropdown-selector 应用截断处理，避免长文本溢出
- dropdown-menu 和 ArtifactTitle 添加文本溢出省略样式

frontend/src/components/ai-elements/artifact.tsx

@@ -63,7 +63,7 @@ export type ArtifactTitleProps = HTMLAttributes<HTMLParagraphElement>;
 
 export const ArtifactTitle = ({ className, ...props }: ArtifactTitleProps) => (
   <div
-    className={cn("text-foreground text-sm font-medium", className)}
+    className={cn("text-foreground flex justify-center  w-full overflow-hidden text-ellipsis whitespace-nowrap text-sm font-medium", className)}
     {...props}
   />
 );

frontend/src/components/ui/dropdown-menu.tsx

@@ -130,7 +130,7 @@ function DropdownMenuRadioItem({
     <DropdownMenuPrimitive.RadioItem
       data-slot="dropdown-menu-radio-item"
       className={cn(
-        "focus:bg-accent focus:text-accent-foreground relative flex cursor-default items-center gap-2 rounded-sm py-1.5 pr-2 pl-8 text-sm outline-hidden select-none data-[disabled]:pointer-events-none data-[disabled]:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        "focus:bg-accent focus:text-accent-foreground relative flex cursor-default items-center gap-2 whitespace-nowrap rounded-sm py-1.5 pr-2 pl-8 text-sm outline-hidden select-none overflow-hidden data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
         className,
       )}
       {...props}

frontend/src/components/ui/dropdown-selector.tsx

@@ -7,6 +7,7 @@ import {
   DropdownMenuRadioItem,
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
+import { cn, truncateMiddle } from "@/lib/utils";
 
 export interface DropdownSelectorOption<T extends string> {
   value: T;
@@ -76,22 +77,26 @@ export function DropdownSelector<T extends string>({
       <DropdownMenuTrigger
         className={
           triggerClassName ??
-          "border-none bg-transparent shadow-none select-none focus:outline-none"
+          "border-none bg-transparent flex justify-center w-full overflow-hidden text-ellipsis whitespace-nowrap shadow-none select-none focus:outline-none"
         }
       >
-        <span className="flex items-center gap-1">
+        <span className="flex w-full justify-center items-center gap-1">
-          {selectedOption?.label ?? value}
+          {truncateMiddle(selectedOption?.label ?? value, 50)}
           {isOpen ? <ChevronUpIcon /> : <ChevronDownIcon />}
         </span>
       </DropdownMenuTrigger>
-      <DropdownMenuContent className={contentClassName}>
+      <DropdownMenuContent className={cn(contentClassName, "max-w-80")}>
         <DropdownMenuRadioGroup
           value={value}
           onValueChange={(v) => onChange(v as T)}
         >
           {options.map((option) => (
-            <DropdownMenuRadioItem key={option.value} value={option.value}>
+            <DropdownMenuRadioItem
-              {option.label}
+              key={option.value}
+              value={option.value}
+              title={option.label}
+            >
+              {truncateMiddle(option.label)}
             </DropdownMenuRadioItem>
           ))}
         </DropdownMenuRadioGroup>

frontend/src/components/workspace/artifacts/artifact-file-detail.tsx

@@ -34,7 +34,7 @@ import { installSkill } from "@/core/skills/api";
 import { streamdownPlugins } from "@/core/streamdown";
 import { checkCodeFile, getFileName } from "@/core/utils/files";
 import { useMarkdownDownload } from "@/core/utils/markdown-download";
-import { cn, copyToClipboard } from "@/lib/utils";
+import { cn, copyToClipboard, truncateMiddle } from "@/lib/utils";
 
 import { CitationLink } from "../citations/citation-link";
 
@@ -236,7 +236,7 @@ export function ArtifactFileDetail({
         <div className="flex min-w-0 grow items-center justify-center">
           <ArtifactTitle>
             {isWriteFile ? (
-              <div className="px-2">{getFileName(filepath)}</div>
+              <div className=" w-full overflow-hidden text-ellipsis whitespace-nowrap px-2">{truncateMiddle(getFileName(filepath), 50)}</div>
             ) : (
               <DropdownSelector
                 value={filepath}

frontend/src/components/workspace/artifacts/artifact-file-list.tsx

@@ -18,7 +18,7 @@ import {
   getFileIcon,
   getFileName,
 } from "@/core/utils/files";
-import { cn } from "@/lib/utils";
+import { cn, truncateMiddle } from "@/lib/utils";
 
 import { useArtifacts } from "./context";
 
@@ -80,12 +80,14 @@ export function ArtifactFileList({
           onClick={() => handleClick(file)}
         >
           <CardHeader className="pr-2 pl-1">
-            <CardTitle className="relative pl-8">
+            <CardTitle className=" relative pl-8 overflow-hidden">
-              <div className="text-sm font-normal">{getFileName(file)}</div>
+              <div className=" text-ellipsis whitespace-nowrap text-sm font-normal" title={getFileName(file)}>
-              <div className="absolute top-2 -left-0.5">
+                {truncateMiddle(getFileName(file), 50)}
-                {getFileIcon(file, "size-6 stroke-[1.5px] stroke-[#333333]")}
               </div>
             </CardTitle>
+             <div className="absolute top-5 left-3">
+                {getFileIcon(file, "size-6 stroke-[1.5px] stroke-[#333333]")}
+            </div>
             <CardDescription className="pl-8 text-xs">
               {getFileExtensionDisplayName(file)} file
             </CardDescription>

frontend/src/lib/utils.ts

@@ -33,3 +33,49 @@ export async function copyToClipboard(text: string): Promise<void> {
   console.log("[copyToClipboard] direct mode", message);
   await navigator.clipboard.writeText(text);
 }
+
+/**
+ * 计算字符串的视觉宽度（中文算2，英文算1）
+ */
+export function getVisualWidth(text: string): number {
+  let width = 0;
+  for (const char of text) {
+    // 中文字符范围：\u4e00-\u9fff（基本汉字）
+    width += /[\u4e00-\u9fff]/.test(char) ? 2 : 1;
+  }
+  return width;
+}
+
+/**
+ * 截断字符串中间部分，保留开头和结尾
+ * 例如: "very-long-file-name.txt" -> "very-lon...me.txt"
+ * 中文按视觉宽度计算（中文算2，英文算1）
+ */
+export function truncateMiddle(text: string, maxVisualWidth: number = 30): string {
+  const visualWidth = getVisualWidth(text);
+  if (visualWidth <= maxVisualWidth) return text;
+
+  const startWidth = Math.ceil(maxVisualWidth * 0.6);
+  const endWidth = Math.floor(maxVisualWidth * 0.4) - 3; // -3 for "..."
+
+  let startPart = "";
+  let currentWidth = 0;
+  for (const char of text) {
+    const charWidth = /[\u4e00-\u9fff]/.test(char) ? 2 : 1;
+    if (currentWidth + charWidth > startWidth) break;
+    startPart += char;
+    currentWidth += charWidth;
+  }
+
+  let endPart = "";
+  currentWidth = 0;
+  for (let i = text.length - 1; i >= 0; i--) {
+    const char = text[i]!;
+    const charWidth = /[\u4e00-\u9fff]/.test(char) ? 2 : 1;
+    if (currentWidth + charWidth > endWidth) break;
+    endPart = char + endPart;
+    currentWidth += charWidth;
+  }
+
+  return `${startPart}...${endPart}`;
+}