fix: improve file upload performance with batch processing and progress feedback

- Add batch processing (5 files concurrently) to uploadNotes function
- Use Promise.allSettled for parallel file processing
- Add setTimeout(0) between batches to yield to event loop
- Show loading toast when uploading more than 5 files
- Add translation keys for uploading progress (en, zh-cn, zh-tw)

Co-authored-by: DeJeune <67425183+DeJeune@users.noreply.github.com>

src/renderer/src/i18n/locales/en-us.json

@@ -2175,7 +2175,8 @@
     "untitled_folder": "New Folder",
     "untitled_note": "Untitled Note",
     "upload_failed": "Note upload failed",
-    "upload_success": "Note uploaded success"
+    "upload_success": "Note uploaded success",
+    "uploading_files": "Uploading {{count}} files..."
   },
   "notification": {
     "assistant": "Assistant Response",

src/renderer/src/i18n/locales/zh-cn.json

@@ -2175,7 +2175,8 @@
     "untitled_folder": "新文件夹",
     "untitled_note": "无标题笔记",
     "upload_failed": "笔记上传失败",
-    "upload_success": "笔记上传成功"
+    "upload_success": "笔记上传成功",
+    "uploading_files": "正在上传 {{count}} 个文件..."
   },
   "notification": {
     "assistant": "助手响应",

src/renderer/src/i18n/locales/zh-tw.json

@@ -2175,7 +2175,8 @@
     "untitled_folder": "新資料夾",
     "untitled_note": "無標題筆記",
     "upload_failed": "筆記上傳失敗",
-    "upload_success": "筆記上傳成功"
+    "upload_success": "筆記上傳成功",
+    "uploading_files": "正在上傳 {{count}} 個檔案..."
   },
   "notification": {
     "assistant": "助手回應",

src/renderer/src/pages/notes/NotesPage.tsx

@@ -621,8 +621,19 @@ const NotesPage: FC = () => {
           throw new Error('No folder path selected')
         }
 
+        // Show loading toast for multiple files to indicate processing
+        let loadingToast: number | string | undefined
+        if (files.length > 5) {
+          loadingToast = window.toast.loading(t('notes.uploading_files', { count: files.length }))
+        }
+
         const result = await uploadNotes(files, targetFolderPath)
 
+        // Dismiss loading toast if shown
+        if (loadingToast) {
+          window.toast.dismiss(loadingToast)
+        }
+
         // 检查上传结果
         if (result.fileCount === 0) {
           window.toast.warning(t('notes.no_valid_files'))

src/renderer/src/services/NotesService.ts

@@ -101,18 +101,37 @@ export async function uploadNotes(files: File[], targetPath: string): Promise<Up
   await createFolders(folders)
 
   let fileCount = 0
+  const BATCH_SIZE = 5 // Process 5 files concurrently to balance performance and responsiveness
 
-  for (const file of markdownFiles) {
-    const { dir, name } = resolveFileTarget(file, basePath)
-    const { safeName } = await window.api.file.checkFileName(dir, name, true)
-    const finalPath = `${dir}/${safeName}${MARKDOWN_EXT}`
+  // Process files in batches to avoid blocking the UI thread
+  for (let i = 0; i < markdownFiles.length; i += BATCH_SIZE) {
+    const batch = markdownFiles.slice(i, i + BATCH_SIZE)
+    
+    // Process current batch in parallel
+    const results = await Promise.allSettled(
+      batch.map(async (file) => {
+        const { dir, name } = resolveFileTarget(file, basePath)
+        const { safeName } = await window.api.file.checkFileName(dir, name, true)
+        const finalPath = `${dir}/${safeName}${MARKDOWN_EXT}`
 
-    try {
-      const content = await file.text()
-      await window.api.file.write(finalPath, content)
-      fileCount += 1
-    } catch (error) {
-      logger.error('Failed to write uploaded file:', error as Error)
+        const content = await file.text()
+        await window.api.file.write(finalPath, content)
+        return true
+      })
+    )
+
+    // Count successful uploads
+    results.forEach((result) => {
+      if (result.status === 'fulfilled') {
+        fileCount += 1
+      } else {
+        logger.error('Failed to write uploaded file:', result.reason)
+      }
+    })
+
+    // Yield to the event loop between batches to keep UI responsive
+    if (i + BATCH_SIZE < markdownFiles.length) {
+      await new Promise((resolve) => setTimeout(resolve, 0))
     }
   }