✨ feat(vscode): profile 值编辑器改为多行+图片粘贴（图片落 .spx/profile-assets）

双击 profile 值单元格改为打开富编辑弹窗：多行 textarea + Ctrl+V 粘贴截图，
⌘/Ctrl+Enter 或点遮罩保存、Esc 取消。值仍是单个字符串，图片存磁盘
（内容寻址 sha1 命名，去重），值里只留 markdown 引用，不撑大 profiles.json。
折叠单元格显示首行 + 含图时加 🖼 徽标。key/列头仍走原内联输入。

- 抽公用 lib/imagePaste：同步探测(preventDefault) + 异步读取，新建工单改用它、行为不变
- 新增扩展侧 profileAssets handler：存图(image/* 校验)/读图(挡路径穿越)
- 新增 useProfileAssets(requestId 关联并发) 与 ProfileCellEditor 弹窗
- 消息两侧同步 profile-asset/save|load|saved|loaded

vscode/webview-ui/src/components/NewIssueModal.tsx

@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useRef, useState } from 'react'
 import { X } from 'lucide-react'
+import { getPastedImageFiles, readClipboardImages } from '../lib/imagePaste'
 
 export interface PastedImage {
   mediaType: string
@@ -37,28 +38,6 @@ interface Props {
   defaultProfileName?: string
 }
 
-function readClipboardImage(file: File): Promise<PastedImage | null> {
-  return new Promise((resolve) => {
-    const reader = new FileReader()
-    reader.onload = () => {
-      const result = reader.result
-      if (typeof result !== 'string') {
-        resolve(null)
-        return
-      }
-      // result shape: "data:image/png;base64,iVBORw0K..."
-      const commaIdx = result.indexOf(',')
-      const header = commaIdx > 0 ? result.slice(0, commaIdx) : ''
-      const base64 = commaIdx > 0 ? result.slice(commaIdx + 1) : ''
-      const mediaMatch = header.match(/^data:([^;]+);base64$/)
-      const mediaType = mediaMatch ? mediaMatch[1] : file.type || 'image/png'
-      resolve({ mediaType, base64, previewDataUrl: result })
-    }
-    reader.onerror = () => resolve(null)
-    reader.readAsDataURL(file)
-  })
-}
-
 export function NewIssueModal({ open, onCancel, onSubmit, profiles, defaultProfileName }: Props) {
   const [value, setValue] = useState('')
   const [images, setImages] = useState<PastedImageWithId[]>([])
@@ -100,22 +79,11 @@ export function NewIssueModal({ open, onCancel, onSubmit, profiles, defaultProfi
   }, [open, onCancel, profiles, defaultProfileName])
 
   const handlePaste = useCallback(async (e: React.ClipboardEvent<HTMLTextAreaElement>) => {
-    const items = e.clipboardData?.items
-    if (!items)
-      return
-    const files: File[] = []
-    for (const item of items) {
-      if (item.kind === 'file' && item.type.startsWith('image/')) {
-        const f = item.getAsFile()
-        if (f)
-          files.push(f)
-      }
-    }
+    const files = getPastedImageFiles(e)
     if (files.length > 0) {
       // Intercept so the file binary doesn't end up pasted as garbled text.
       e.preventDefault()
-      const parsed = await Promise.all(files.map(readClipboardImage))
-      const ok = parsed.filter((p): p is PastedImage => p !== null)
+      const ok = await readClipboardImages(files)
       if (ok.length === 0)
         return
       // Assign sequential numbers; mirror pastedTexts and insert `[Image #N]`