feat(web-client): add per-type file size validation on upload

Enforce Claude API file size limits at upload time with user-friendly
error messages:
- Images: max 5MB (Claude API hard limit)
- PDF: max 25MB (32MB request limit minus headroom)
- Other documents: max 50MB (general upload limit)

Replaced duplicate ALLOWED_TYPES/MAX_FILE_SIZE in InputArea with shared
validateFile() from fileService, showing alert() on rejection.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/web-client/src/features/chat/presentation/components/InputArea.tsx

@@ -2,6 +2,7 @@ import { useState, useRef, useEffect, KeyboardEvent, ChangeEvent, ClipboardEvent
 import { Send, Paperclip, X, Image, FileText, Loader2, Upload } from 'lucide-react';
 import { clsx } from 'clsx';
 import { FileAttachment } from '../stores/chatStore';
+import { validateFile, ALLOWED_FILE_TYPES } from '@/shared/services/fileService';
 
 interface PendingFile {
   id: string;
@@ -20,25 +21,6 @@ interface InputAreaProps {
   uploadProgress?: Record<string, { progress: number; status: string }>;
 }
 
-// 允许上传的文件类型
-const ALLOWED_TYPES = [
-  'image/jpeg',
-  'image/png',
-  'image/gif',
-  'image/webp',
-  'image/svg+xml',
-  'application/pdf',
-  'application/msword',
-  'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
-  'application/vnd.ms-excel',
-  'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
-  'text/plain',
-  'text/csv',
-  'text/markdown',
-];
-
-const MAX_FILE_SIZE = 50 * 1024 * 1024; // 50MB
-
 export function InputArea({
   onSend,
   disabled,
@@ -89,12 +71,9 @@ export function InputArea({
 
     const validFiles: File[] = [];
     Array.from(files).forEach((file) => {
-      if (!ALLOWED_TYPES.includes(file.type)) {
-        console.warn(`不支持的文件类型: ${file.type}`);
-        return;
-      }
-      if (file.size > MAX_FILE_SIZE) {
-        console.warn(`文件过大: ${file.name}`);
+      const result = validateFile(file);
+      if (!result.valid) {
+        alert(result.error);
         return;
       }
       validFiles.push(file);
@@ -116,12 +95,9 @@ export function InputArea({
   const processFiles = (files: File[]) => {
     const validFiles: File[] = [];
     files.forEach((file) => {
-      if (!ALLOWED_TYPES.includes(file.type)) {
-        console.warn(`不支持的文件类型: ${file.type}`);
-        return;
-      }
-      if (file.size > MAX_FILE_SIZE) {
-        console.warn(`文件过大: ${file.name}`);
+      const result = validateFile(file);
+      if (!result.valid) {
+        alert(result.error);
         return;
       }
       validFiles.push(file);
@@ -301,7 +277,7 @@ export function InputArea({
           ref={fileInputRef}
           type="file"
           multiple
-          accept={ALLOWED_TYPES.join(',')}
+          accept={[...ALLOWED_FILE_TYPES.image, ...ALLOWED_FILE_TYPES.document].join(',')}
           onChange={handleFileSelect}
           className="hidden"
         />

packages/web-client/src/shared/services/fileService.ts

@@ -45,9 +45,18 @@ export const ALLOWED_FILE_TYPES = {
   ],
 };
 
-export const MAX_FILE_SIZE = 50 * 1024 * 1024; // 50MB
 export const MAX_DIRECT_UPLOAD_SIZE = 10 * 1024 * 1024; // 10MB
 
+/** Claude API 文件大小限制（按类型区分） */
+export const FILE_SIZE_LIMITS = {
+  /** 图片: Claude API 硬限制 5MB */
+  image: 5 * 1024 * 1024,
+  /** PDF: Claude API 整个请求 32MB 限制，单文件留 25MB */
+  pdf: 25 * 1024 * 1024,
+  /** 其他文档（Word/Excel/Text 等）: 通用 50MB 上传限制 */
+  document: 50 * 1024 * 1024,
+} as const;
+
 /**
  * 验证文件类型和大小
  */
@@ -61,10 +70,26 @@ export function validateFile(file: File): { valid: boolean; error?: string } {
     };
   }
 
-  if (file.size > MAX_FILE_SIZE) {
+  // 按文件类型检查大小限制
+  const fileType = getFileType(file.type);
+  let maxSize: number;
+  let typeLabel: string;
+
+  if (fileType === 'image') {
+    maxSize = FILE_SIZE_LIMITS.image;
+    typeLabel = '图片';
+  } else if (file.type === 'application/pdf') {
+    maxSize = FILE_SIZE_LIMITS.pdf;
+    typeLabel = 'PDF';
+  } else {
+    maxSize = FILE_SIZE_LIMITS.document;
+    typeLabel = '文档';
+  }
+
+  if (file.size > maxSize) {
     return {
       valid: false,
-      error: `文件大小超过限制。最大允许: ${MAX_FILE_SIZE / 1024 / 1024}MB`,
+      error: `${typeLabel}大小超过限制 (${(file.size / 1024 / 1024).toFixed(1)}MB)。${typeLabel}最大允许: ${maxSize / 1024 / 1024}MB`,
     };
   }