fix: 明确提示超大 PNG 像素限制

tests/image-validation.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from 'vitest'
+import { MAX_IMAGE_PIXELS, isSharpPixelLimitError } from '../server/utils/image-validation'
+
+describe('图片上传校验', () => {
+  it('识别 Sharp 像素上限错误', () => {
+    expect(isSharpPixelLimitError(new Error('Input image exceeds pixel limit'))).toBe(true)
+  })
+
+  it('不把普通解析错误误判为像素过大', () => {
+    expect(isSharpPixelLimitError(new Error('Input buffer contains unsupported image format'))).toBe(false)
+    expect(MAX_IMAGE_PIXELS).toBe(40_000_000)
+  })
+})