Fix: Add video icon in knowledge base #10703 (#10832)

### What problem does this PR solve?

Fix: Add video icon in knowledge base

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/constants/file.ts

@@ -12,4 +12,9 @@ export const FileIconMap = {
   txt: 'text',
   csv: 'pdf',
   md: 'md',
+  mp4: 'mp4',
+  avi: 'avi',
+  mkv: 'mkv',
+  rmvb: 'rmvb',
+  wav: 'wav',
 };