fix: chain providers, i18n, dedup isWebRuntime, and a11y label

Conditionally build `chainProviders` so empty `urls` arrays are never passed downstream. Replace hardcoded "Chain ticker: " with `capitalize(t('chain_ticker'))` and add the translation key to all locales. Remove the duplicate `isWebRuntime` in `media-hosting-settings.tsx` in favor of the shared implementation in `show-upload-controls`. Add `aria-label` to the directory codes input in `TopbarEditModal`.

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

@@ -226,16 +226,13 @@ const AdvancedSettings = () => {
     const plebbitRpcClientsOptions = p2pRpcRef.current?.value.trim() ? [p2pRpcRef.current.value.trim()] : undefined;
     const dataPath = p2pDataPathRef.current?.value.trim() || undefined;
 
-    const chainProviders = {
-      eth: {
-        urls: ethRpcUrls,
-        chainId: 1,
-      },
-      sol: {
-        urls: solRpcUrls,
-        chainId: 101,
-      },
-    };
+    const chainProviders: Record<string, { urls: string[] | undefined; chainId: number }> = {};
+    if (ethRpcUrls && ethRpcUrls.length > 0) {
+      chainProviders.eth = { urls: ethRpcUrls, chainId: 1 };
+    }
+    if (solRpcUrls && solRpcUrls.length > 0) {
+      chainProviders.sol = { urls: solRpcUrls, chainId: 101 };
+    }
 
     try {
       await setAccount({

src/components/settings-modal/crypto-wallets-setting/crypto-wallets-setting.tsx

@@ -102,7 +102,7 @@ const CryptoWalletsForm = ({ account }: { account: Account | undefined }) => {
     walletsArray.length > 0 ? (
       <div key={selectedWallet} className={styles.walletBox}>
         <div className={`${styles.walletField} ${styles.step1}`}>
-          <span className={styles.walletFieldTitle}>Chain ticker: </span>
+          <span className={styles.walletFieldTitle}>{capitalize(t('chain_ticker'))}: </span>
           <input
             type='text'
             onChange={(e) => setWalletsArrayProperty(selectedWallet, 'chainTicker', e.target.value)}

src/components/settings-modal/media-hosting-settings/media-hosting-settings.tsx

@@ -1,16 +1,12 @@
-import { Capacitor } from '@capacitor/core';
 import { useTranslation } from 'react-i18next';
 import useMediaHostingStore, { MEDIA_HOSTING_PROVIDERS } from '../../../stores/use-media-hosting-store';
 import type { ProviderId } from '../../../lib/media-hosting/types';
+import { isWebRuntime } from '../../../lib/media-hosting/show-upload-controls';
 import styles from '../interface-settings/interface-settings.module.css';
 
 const RADIO_NAME = 'media-hosting-provider';
 const RELEASES_URL = 'https://github.com/bitsocialhq/5chan/releases/latest';
 
-function isWebRuntime(): boolean {
-  return Capacitor.getPlatform() === 'web' && !window.electronApi?.isElectron;
-}
-
 const MediaHostingSettings = () => {
   const { t } = useTranslation();
   const uploadMode = useMediaHostingStore((state) => state.uploadMode);

src/components/topbar-edit-modal/topbar-edit-modal.tsx

@@ -59,6 +59,7 @@ const TopbarEditModalForm = ({
           type='text'
           className={styles.directoryInput}
           placeholder='Example: jp tg mu'
+          aria-label='Directory codes'
           value={localDirectoryInput}
           onChange={(e) => setLocalDirectoryInput(e.target.value)}
         />