fix(ui): poll checkmark uses folds Icon instead of Unicode glyph (native-cinny nit)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/components/message/content/PollContent.tsx

@@ -1,6 +1,6 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 import React, { useCallback, useEffect, useState } from 'react';
-import { Box, color, config, Text, toRem } from 'folds';
+import { Box, color, config, Icon, Icons, Text, toRem } from 'folds';
 import { RelationsEvent } from 'matrix-js-sdk/lib/models/relations';
 import { RoomEvent } from 'matrix-js-sdk';
 import { useMatrixClient } from '../../../hooks/useMatrixClient';
@@ -339,11 +339,7 @@ export function PollContent({
                     transition: 'all 0.15s',
                   }}
                 >
-                  {selected && isMultiple ? (
-                    <Text as="span" size="T200" style={{ lineHeight: 1 }}>
-                      ✓
-                    </Text>
-                  ) : null}
+                  {selected && isMultiple ? <Icon size="50" src={Icons.Check} /> : null}
                 </span>
                 <Text as="span" size="T300" style={{ flexGrow: 1 }}>
                   {text}