refactor: remove NFT avatar functionality

Removes avatar-settings component, avatar-visibility store, and all
avatar rendering from posts. Strips avatar from account JSON, renames
NFT gateway label to media IPFS gateway, removes Polygon RPC and
hide-avatars toggle. Deletes 6 avatar-related translation keys.

src/components/settings-modal/interface-settings/interface-settings.tsx

@@ -1,6 +1,5 @@
 import { useState } from 'react';
 import { useTranslation } from 'react-i18next';
-import useAvatarVisibilityStore from '../../../stores/use-avatar-visibility-store';
 import useTheme from '../../../hooks/use-theme';
 import packageJson from '../../../../package.json';
 import styles from './interface-settings.module.css';
@@ -124,13 +123,8 @@ const InterfaceLanguage = () => {
 
 const InterfaceSettings = () => {
   const { t } = useTranslation();
-  const { hideAvatars, setHideAvatars } = useAvatarVisibilityStore();
   const { fitExpandedImagesToScreen, setFitExpandedImagesToScreen } = useExpandedMediaStore();
 
-  const handleHideAvatarsChange = (e: React.ChangeEvent<HTMLInputElement>) => {
-    setHideAvatars(e.target.checked);
-  };
-
   return (
     <div className={styles.interfaceSettings}>
       <div className={styles.version}>
@@ -152,12 +146,6 @@ const InterfaceSettings = () => {
         </label>
         <div className={styles.settingTip}>{capitalize(t('fit_expanded_images_to_screen_tip'))}</div>
       </div>
-      <div className={styles.setting}>
-        <label>
-          <input type='checkbox' checked={hideAvatars} onChange={handleHideAvatarsChange} /> {capitalize(t('hide_avatars'))}
-        </label>
-        <div className={styles.settingTip}>{capitalize(t('hide_avatars_tip'))}</div>
-      </div>
     </div>
   );
 };