feat(upload): improve file upload progress and error handling

- Add persistent progress bars and error states
- Remove individual file toasts in favor of batch status
- Keep dialog open until manual close
- Move Progress component inline to reduce dependencies

lightrag_webui/src/components/documents/UploadDocumentsDialog.tsx

@@ -21,11 +21,20 @@ export default function UploadDocumentsDialog() {
   const [open, setOpen] = useState(false)
   const [isUploading, setIsUploading] = useState(false)
   const [progresses, setProgresses] = useState<Record<string, number>>({})
+  // Track upload errors for each file
+  const [fileErrors, setFileErrors] = useState<Record<string, string>>({})
 
   const handleDocumentsUpload = useCallback(
     async (filesToUpload: File[]) => {
       setIsUploading(true)
 
+      // Reset error states before new upload
+      setFileErrors({})
+      
+      try {
+        // Use a single toast for the entire batch upload process
+        toast.promise(
+          (async () => {
             try {
               await Promise.all(
                 filesToUpload.map(async (file) => {
@@ -37,21 +46,40 @@ export default function UploadDocumentsDialog() {
                         [file.name]: percentCompleted
                       }))
                     })
-              if (result.status === 'success') {
+                    
-                toast.success(t('documentPanel.uploadDocuments.success', { name: file.name }))
+                    // Store error message if upload failed
-              } else {
+                    if (result.status !== 'success') {
-                toast.error(t('documentPanel.uploadDocuments.failed', { name: file.name, message: result.message }))
+                      setFileErrors(prev => ({
+                        ...prev,
+                        [file.name]: result.message
+                      }))
                     }
                   } catch (err) {
-              toast.error(t('documentPanel.uploadDocuments.error', { name: file.name, error: errorMessage(err) }))
+                    // Store error message from exception
+                    setFileErrors(prev => ({
+                      ...prev,
+                      [file.name]: errorMessage(err)
+                    }))
                   }
                 })
               )
+              // Keep dialog open to show final status
+              // User needs to close dialog manually
+            } catch (error) {
+              console.error('Upload failed:', error)
+            }
+          })(),
+          {
+            loading: t('documentPanel.uploadDocuments.uploading.batch'),
+            success: t('documentPanel.uploadDocuments.success.batch'),
+            error: t('documentPanel.uploadDocuments.error.batch')
+          }
+        )
       } catch (err) {
-        toast.error(t('documentPanel.uploadDocuments.generalError', { error: errorMessage(err) }))
+        // Handle general upload errors
+        toast.error(`Upload error: ${errorMessage(err)}`)
       } finally {
         setIsUploading(false)
-        // setOpen(false)
       }
     },
     [setIsUploading, setProgresses, t]
@@ -61,9 +89,15 @@ export default function UploadDocumentsDialog() {
     <Dialog
       open={open}
       onOpenChange={(open) => {
-        if (isUploading && !open) {
+        // Prevent closing dialog during upload
+        if (isUploading) {
           return
         }
+        if (!open) {
+          // Reset states when dialog is closed
+          setProgresses({})
+          setFileErrors({})
+        }
         setOpen(open)
       }}
     >
@@ -85,6 +119,7 @@ export default function UploadDocumentsDialog() {
           description={t('documentPanel.uploadDocuments.fileTypes')}
           onUpload={handleDocumentsUpload}
           progresses={progresses}
+          fileErrors={fileErrors}
           disabled={isUploading}
         />
       </DialogContent>

lightrag_webui/src/components/ui/FileUploader.tsx

@@ -10,7 +10,6 @@ import { toast } from 'sonner'
 import { cn } from '@/lib/utils'
 import { useControllableState } from '@radix-ui/react-use-controllable-state'
 import Button from '@/components/ui/Button'
-import Progress from '@/components/ui/Progress'
 import { ScrollArea } from '@/components/ui/ScrollArea'
 import { supportedFileTypes } from '@/lib/constants'
 
@@ -47,6 +46,14 @@ interface FileUploaderProps extends React.HTMLAttributes<HTMLDivElement> {
    */
   progresses?: Record<string, number>
 
+  /**
+   * Error messages for failed uploads.
+   * @type Record<string, string> | undefined
+   * @default undefined
+   * @example fileErrors={{ "file1.png": "Upload failed" }}
+   */
+  fileErrors?: Record<string, string>
+
   /**
    * Accepted file types for the uploader.
    * @type { [key: string]: string[]}
@@ -117,6 +124,7 @@ function FileUploader(props: FileUploaderProps) {
     onValueChange,
     onUpload,
     progresses,
+    fileErrors,
     accept = supportedFileTypes,
     maxSize = 1024 * 1024 * 200,
     maxFileCount = 1,
@@ -161,16 +169,7 @@ function FileUploader(props: FileUploaderProps) {
       }
 
       if (onUpload && updatedFiles.length > 0 && updatedFiles.length <= maxFileCount) {
-        const target = updatedFiles.length > 0 ? `${updatedFiles.length} files` : 'file'
+        onUpload(updatedFiles)
-
-        toast.promise(onUpload(updatedFiles), {
-          loading: `Uploading ${target}...`,
-          success: () => {
-            setFiles([])
-            return `${target} uploaded`
-          },
-          error: `Failed to upload ${target}`
-        })
       }
     },
 
@@ -265,6 +264,7 @@ function FileUploader(props: FileUploaderProps) {
                 file={file}
                 onRemove={() => onRemove(index)}
                 progress={progresses?.[file.name]}
+                error={fileErrors?.[file.name]}
               />
             ))}
           </div>
@@ -274,13 +274,33 @@ function FileUploader(props: FileUploaderProps) {
   )
 }
 
+interface ProgressProps {
+  value: number
+  error?: boolean
+}
+
+function Progress({ value, error }: ProgressProps) {
+  return (
+    <div className="h-2 w-full overflow-hidden rounded-full bg-secondary">
+      <div
+        className={cn(
+          'h-full transition-all',
+          error ? 'bg-destructive' : 'bg-primary'
+        )}
+        style={{ width: `${value}%` }}
+      />
+    </div>
+  )
+}
+
 interface FileCardProps {
   file: File
   onRemove: () => void
   progress?: number
+  error?: string
 }
 
-function FileCard({ file, progress, onRemove }: FileCardProps) {
+function FileCard({ file, progress, error, onRemove }: FileCardProps) {
   return (
     <div className="relative flex items-center gap-2.5">
       <div className="flex flex-1 gap-2.5">
@@ -290,7 +310,14 @@ function FileCard({ file, progress, onRemove }: FileCardProps) {
             <p className="text-foreground/80 line-clamp-1 text-sm font-medium">{file.name}</p>
             <p className="text-muted-foreground text-xs">{formatBytes(file.size)}</p>
           </div>
-          {progress ? <Progress value={progress} /> : null}
+          {error ? (
+            <div className="text-destructive text-sm">
+              <Progress value={100} error={true} />
+              <p className="mt-1">{error}</p>
+            </div>
+          ) : (
+            progress ? <Progress value={progress} /> : null
+          )}
         </div>
       </div>
       <div className="flex items-center gap-2">