more chance to see picture on user card

src/components/user-card/user-card.tsx

@@ -1,4 +1,4 @@
-import React from 'react'
+import React, { useMemo } from 'react'
 import { sha256 } from 'js-sha256'
 import { useState, useEffect, useRef } from 'react'
 import { Box, useColorMode, Text } from '@chakra-ui/react'
@@ -19,7 +19,7 @@ const REACTION_EMOJIS = {
   clap: '👏'
 }
 
-export function getGravatarURL(email, user) {
+export function getGravatarURL(email) {
   if (!email) return void 0
   const address = String(email).trim().toLowerCase()
   const hash = sha256(address)
@@ -50,6 +50,8 @@ export const UserCard = ({
   const [showReaction, setShowReaction] = useState(false);
   const timeoutRef = useRef<NodeJS.Timeout | null>(null);
 
+  const randomGravatarPath = useMemo(() => Math.random() * 1000, [])
+  
   // Обрабатываем изменение реакции
   useEffect(() => {
     if (reaction) {
@@ -83,7 +85,7 @@ export const UserCard = ({
       position="relative"
     >
       <Avatar 
-        src={imageError ? getGravatarURL(student.email, null) : (student.picture || getGravatarURL(student.email, null))} 
+        src={imageError ? getGravatarURL(student.email || randomGravatarPath) : (student.picture || getGravatarURL(student.email))} 
         onError={() => {
           if (!imageError && student.picture) {
             setImageError(true);